Delayed Choice Quantum Eraser: Does the Future Affect the Present?

[@7john7able]

I will let you know how it all works last year.

[@flanneryred5755]

The perfect comment.

[@PansBox11]

I can’t decode what this video is talking about therefor it doesn’t exist.

[@blapty]

😂

[@adbell3364]

I WAS going to present an all "sciency" theory. An then I read your comment. The resulting laughter took the wind out of my sails. Great comment!

[@十方幻镜墙凸面八卦镜]

😊

[@robertpillowjr.1672]

"The Universe is not only stranger than we imagine, it is stranger than we can imagine". Truer words have never been spoken...

[@sidviscous5959]

as the philosopher once said: "Things are even less as they seem than you think."

[@kevinslattery5748]

Truth is stranger than fiction. That's probably why the left don't like the truth, it's not one of them, so they're haters, haters of the ...

[@gianttigerfilms]

Rip Terrence

[@damienmcmurray9786]

kevin slattery the right hates science and education. You aren’t making sense.

[@kevinslattery5748]

@@damienmcmurray9786 That's the opposite of what I observe. The left seem to live in an imaginary world dissociated from sound social foundation likely bought about by dissociation of their left and right hemispheres of their brain. Overly weighted by emotions, lacking sound logical analysis, conclusions are rushed like there's a need for a cocaine high to satisfy self judgement over other like minded social justice warriors.

[@ManWhoPlaysTennis]

This is very high quality material. It definitely does not receive the praise it deserves. Not only is Arvin very articulate - which is of the utmost importance in describing a highly sophisticated branch of science with compromising the profundity or accuracy of his explanations - but the speed of narration is perfect. Just slow enough to allow the audience to gather what he is saying, and just quick enough to keep our attention. This is brilliant, brilliant material, and I have learned very much from this channel. Fantastic visuals too!

[@Tesseract9630]

I agree.

[@kcarrier59]

No one makes the complex easy to understand as well as Ash does.

[@jlpsinde]

True

[@oliver_siegel]

Agreed! First time I *really* understood delayed choice quantum eraser!

[@jack.d7873]

Agree. This man is brilliant at his craft. I honestly believe that one day humanity will find the purpose of life. Us and animals alike. And it will come about by a culmination of great physicists and brilliant summaries like this. Einstein built his theories based on previous physics, so having easy to understand explanations is opening a possible further understanding of the universe to billions of more average minded people that may be able to speculate these concepts in a unique way, similar to the way Einstein conceptualised a universe without a Luminiferous Aether.

[@Jack-vy2vx]

Perfectly explained. Shouldn’t be underestimated. While others are more concerned if they appear smart and aloof, Arvin decided to make everyone look smart.

[@BrokenSymetry]

I've watched a lot of explanations of quantum eraser, this is the first one I fully understood. Awesome video!

[@ernavendu]

Same here

[@CalvinHikes]

And this was the first one that I did not understand. I just feel like there's not enough detail. So much was left out that I don't think a person could I understand enough about the delayed response experiment.

[@eje4794]

@@CalvinHikes I think he means, fully understands the philosophical implications. 🤔

[@spearfishingmiami]

I dont think too many people actually read these comments.. but this is an amazingggg video explaining something as complicated as the quantum delayed choice experiment yet simplifying it for people that are new to this topic.

[@akarshrastogi3682]

Yeah, the PBS space time video series about Quantum mech is far better, but this one is far simpler and well-explained for laypeople

[@ricbrunner3880]

The quantum delayed choice experiment is a relatively easy experiment to rap your head around and think about. The harder part to think about is its affects on the present and past. Just what do the end results say about reality future and past.

[@lemondeestloeuvredunenfant4633]

@@akarshrastogi3682 So, you would watch this one of Arvin first to understand the experience and after this one of PBS to deepen the subject.

[@akarshrastogi3682]

@@lemondeestloeuvredunenfant4633 No I use this one to introduce other people to the concept, also the PBS for people who have more scientific understanding already. I personally have acquired most of my knowledge in Physics through graduate textbooks.

[@lemondeestloeuvredunenfant4633]

​@@akarshrastogi3682 yeah ? And so ? That's what I said. I don't see the difference.

[@RemmelttenNapel]

When 2 photons become entangled (in space), they also become entangled in time, thus the "spooky action at a distance" also becomes a "spooky action in time"

[@Dashman100]

Ok, but how that spooky action in time knows whether we observe or not before hitting 50/50 chance? Becoz the obervation is not entangled...!!! U missed the main logic...!!!

[@KCUFyoufordoxingme]

Photons do not experience any time when at the speed of light. To them, everything is instantaneous.

[@new-knowledge8040]

Yes, but more important than that, the Delayed Choice Quantum Eraser experiment was designed by Kim, Kulik, Shih and Scully in 1999. But why wasn't Mulder in on the design as well ?

[@gotnoshoes22]

I totally agree. It’s odd how experts still portray the collapse and entangled particals as happening faster than light. They miss this point. The affect transcends time just as it transcend space.

[@Dashman100]

Hi Remmelt and Crish Potella, Yes, that's what he said. If spooky action in time is possible, then we can affect both future & past...!!!

[@allainefria4589]

this is one of my fave science channel ever. Thank you for existing.

[@Parinmahomedriaz4184]

Same here!

[@jeff01121]

This is the kind of video that fuels your enthusiasm to ask why, rather than snubbing it out. Thank you!

[@mattsheezy5469]

This particular experiment satisfies the same part of my brain that loves the paranormal. Who needs Ghosts, and Bigfoot when there’s real life mysteries in the lab, and out in deep space.

[@EKDupre]

haha nice. who needs supernatural when ya got... natural!

[@somebodysomewhere5571]

Humans. Humans do. We are dependent on the supernatural.

[@Bomba_drastic]

Yes

[@sasukerinnegan6787]

@@somebodysomewhere5571 yet I would argue that anything known as supernatural is just unexplained natural. So that statement makes no sense sir

[@somebodysomewhere5571]

@@sasukerinnegan6787 You statement made far less sense than mine. You have little to no evidence we can explain everything first off, secondly i was talking about it from a emotional level. We are made for something grander than our natural world so we long for something more is what i was saying.

[@edmilton738]

Perhaps past, present and future exist as a single moment, and the flow of time is an illusion ??

[@sterrre1]

Time is relative to the speed of the observer. The faster you travel the slower time moves for you relative to the rest of the universe. Approaching lightspeed will continue to slow down time until you reach the speed of light where time stops altogether and all moments in the universe are experienced as the same moment. This is similar to how time dilation around blackholes work. Although that has more to do with the curving of spacetime than just speed. The future does not affect the past, time can't travel backwards. Instead a light photon experiences all moments instantaneously.

[@carbon1479]

That's difficult to grock because in a simple sense you'd think that every particle in the universe in that case should be entangled and the question becomes how would we test for such a unity.

[@sterrre1]

@@carbon1479 it's hard to test for entanglement, but the time equations are pretty straight forward. Physicists rely on general relativity equations first laid out by Einstein. Observing slight time differences on satellites orbiting Earth does line up with the same equations that say time doesn't pass for photons. Also, I was slightly wrong. Time is not relative to the speed exactly, that's just a simple way to say it. it's relative to the space-time curvature. A spacetime curvature is greater if an object has greater mass density or speed, especially when approaching relativistic speeds.

[@silverwiskers7371]

Yep, seems logical, good work

[@netbookeater]

Yes

[@tsjoencinema]

This could be one of those "the answer is staring at you in the face" kind of thing. We're not ready yet.

[@CDs_YouTube_]

probably some rule that would only apply to entangled partials. entanglement negates distance,,,,,,,,,,,, ? and time 🤷🏼‍♂️

[@SyenPie]

@@CDs_KZbin_ The fact that entanglement occurs instantaneously (or atleast 10,000 times faster than the speed of light) regardless of distance has already been shown experimentally.

[@CDs_YouTube_]

@@SyenPie 🤨 Is that fast enough to go back in time? 🙂 That’s the point the video and I were making. 🙂 That’s a cool fact though. 😎

[@ETBrooD]

The universe could simply be wholly deterministic. Solves the whole problem. We just don't like that idea.

[@ciarasweeney]

@@ETBrooD Not exactly. Determinism is an emergent function of causality. The future path of a pinball in a machine could theoretically be decided by initial conditions, but it still needs to get there. This is more akin to determining that a pinball will score a point but only after it has already gone out of play. The causality isn't there. Or rather, it could be a determinist result, but there is nothing preventing disagreement between entangled particles also being a determinist result from a causal perspective. But they don't do that.

[@vnietov]

Yesterday I will understand this experiment.

[@williamolenchenko5772]

But tomorrow you will forget what you understood yesterday.

[@seenivasanramasamy4627]

After 3, 5 months i understood both

[@BugRib]

I'm from the future on a different branch of the Universal Wave Function!!! (i.e. I'm commenting on a post from five months ago.)

[@smitabhandari9327]

lol

[@The_Revealer_7]

@@seenivasanramasamy4627 Yes, it was a delayed choice in your brain

[@groundcontrol6876]

So this is why it rains after I wash my car.

[@phaandorpertwee6981]

more like: this is why you wash your car before it rains.

[@guidedmeditation2396]

This experiment is indicative of so much more than it even tries to ponder. What needs to be evaluated is the mechanism that takes the "eternal now" and makes it appear like a seamless flow of time. I believe the infinite multiple universes model is the only way to go. All possibilities are predetermined and laid out and consciousness travels through them like a slot car experiencing the choices. Minor perception choices are simply perceived by the consciousness while major choices requiring a shift of actual universes take place when needed. You could use a japanese pinball pachinco machine as an example where you flip the ball bearings with a paddle and they bounce down all number of ways through the course down to the bottom. You could flip millions of balls through this course and each ball will experience the course in its own way. There is no time so any mechanism of consciousness not only would need to be able to predetermine past and future, it would "have to" predetermine past and future at once.

[@powergannon]

My favorite joke about that was from an episode of Green Acres. Oliver was taken to court by a Native American rain dancer because he wasn’t paid after making it rain. Oliver’s defense was “He didn’t make it rain. It rained because I washed my car.” The judge said “Do you really believe that?” “No, but it makes just as much sense as this guy dancing”. The judge agreed and threw out the case.

[@kcarrier59]

@@guidedmeditation2396 The past, present, and future are inextricably linked like a chain. An oscillation at the future end of the chain will ripple backwards into the past and vice versa. How else can psychics predict the future? Years ago, I dreamed that my father called me early in the morning to ask me if I wanted to ride with him and my younger brothers to Houston for a fun day at Astroworld. I was awakened by the phone ringing and upon answering, I heard my father's voice asking me to join him for a ride to Houston-- saying the exact same words that I heard him say in the dream.

[@guidedmeditation2396]

@@kcarrier59 Also it is important to understand that ALL consciousness is a thread of the ONE overall consciousness. I like to think of it like a bundle of fiber optic strands all bunched at the bottom where there is a light and then each of the micro strands has a tiny light shining at the other end. This is why people can know things from within. Intuition is "Taught From Within". Mediums and so-called psychics are no different than you or I. We actually all have the same ability. They are just knowledgeable on how to use what we all have. The same goes for remote viewing and all kinds of so called 6th sense abilities.

[@angelinaalonso6322]

Oh my god. Two things. This is the first time I understood the experiment, you are a wonderful teacher. And second, what the hell is going on?!

[@Gam1n4eva]

yea PBS Space Time makes it too hard

[@winstonalf]

Ha ha welcome to the actual reality... Or is it?

[@paulleader9532]

A photon experiences no time so therefore in our perception any measurement to determine it's position is instantaneous throughout spacetime. It has nothing to do with hell. Quite the opposite. It's somewhat similar to peoples belief that the big bang theory is not in the bible. It very much is and science pretty much proved it. It's a matter of perception, looking at the numbers, and looking at the science. Time dilation is a very difficult thing to get your head around.

[@JustinCase99999]

Thank you for explaining this in a way I could understand. I thought the double slit experiment was amazing enough in itself, but this is mindblowing.

[@lh1690]

According to relativity something travelling at the speed of light appears to take a finite time to get from A to B to a stationary observer but from the perspective of the traveller it takes zero time. So from the perspective of the photon it hits both detectors simultaneously, so there is no future and past to it, it just appears that way to the observer.

[@robmorgan1214]

Bingo. Add on some entanglement and the right dof/statistics for your basis functions and you just designed the whole experiment. The hard part was what Feynman and Wheeler had to do to puzzle this stuff out before the data was available. It's probably why he said qm was impossible to understand... well he had it rough his uncertainty was a bit on the high side due to a lack of data... building the mental models necessary to comprehend this stuff is much easier when you have a target to shoot at and a couple of generations of people whittling away at proper pedogogy...

[@Raptor828]

i was thinking that too - time doesn't make sense for a photon

[@lonm2m]

If the speed of light is constant, it should not hit the detectors simultaneously though, unless the distance that the light "sees" is not the same as what we "observers" see.

[@robmorgan1214]

@@Raptor828 nothing really makes sense to a photon, the surreal bastards. I register my contempt for them via sunscreen and dark glasses.

[@lh1690]

@@lonm2m Well that's the point. When someone travels at the speed of light, what they see and what an observer sees in terms of time between point A and B is different. Also light appears to have the same speed regardless of the relative motion of an observer. So what appears to be the speed of light might not actually be the true speed of light.

[@BatJeff]

This is something that has confused me FOREVER. Thank you for being the first person to explain delayed choice and this experiment in a way it was easy to understand.

[@Cats2Fat]

This is the most shocking experiment I’ve seen in my lifetime.

[@kenperlman2204]

In anybody’s lifetime.

[@MrFlameRad]

It's literally changed my perspective on everything.

[@shreeshchhabbi]

Same here.

[@LilloFGuadalupi]

Ahahah!!!

[@MrFlameRad]

@Fred Forbes what you're saying makes no sense. I don't care about personally being able to change the past but the fact that matter/energy is capable of communicating across time is the biggest news I've ever heard in the world of science. It proves that time isn't exactly what we think it is

[@easytriops5951]

I just came here from a comment under a Neil de Grasse Tyson video. This is honestly the best explanation I have heard until now to this topic and experiments. On your channel home page it says: "If you can't explain it simply, you haven't understood it well enough." and you have explained it so simply, that many people including myself can now finally understand this, yet the answer to this problem in quantum physics is still unknown. Maybe we will find out some day...

[@monkeyrobotsinc.9875]

Gross. Don't watch that guy's videos.

[@renedekker9806]

It's too bad that his explanation is incorrect. "If you explain it too simply, you haven't understood it well enough"

[@PsychicAlchemy]

Why did the retrocausality expert cross the road? Because he got to the other side.

[@ragatrix]

You are describing a surprisingly apt scenario, all things considered.

[@MrMegarag]

I don't think I've ever saved so many videos from one single channel like I do here. I really appreciate how you describe the physical experiments instead of just telling us the conclusions. Your explanations are so clear that I can talk to other people about quantum physics with a lot of consistency. Thank you for this incredible work.

[@ArvinAsh]

Glad to hear that!

[@damo5701]

@@ArvinAsh Have they conducted the experiment as shown @5:13 but instead of leaving the deflectors for detectors 2 &3 to a 50% chance but control them to try and engineer an opposite outcome. I.e. when detector 1 measures a wave interference can they then direct the photon through to detector 2/3 after the wave pattern has been detected at 1? One possible reason for the behavior observed in the video is that time i.e. past present and future all exist at once (or at least for entanglement) and it is only our perception of time that appears to flow in one direction or perhaps time behaves differently for mass versus energy.

[@pedrocarvalho4999]

A bit like presidential elections in my country. You know the aftermath before voting begins.

[@dickfantastic7908]

Where are you from?

[@anandsuralkar2947]

Lol

[@mdtalhaansari1096]

The joke loses the punch if your readers don't know what country you are from. The universe is not strange enough to let us know that.

[@pedrocarvalho4999]

@@afterSt0rm, certíssimo, bulls eye.... See what Im talking about? Here people get to know stuff ahead of causality. 😆

[@LisztyLiszt]

I thought you meant USA, where representatives choose their voters rather than voters choosing their representatives.

[@AnthonyGoodley]

I'm sending this video to a friend who wasn't familiar with even the basic double slit experiment. Much less this Quantum erasure version. That ending was golden man!

[@wxman2003]

I can't believe I told myself to watch this 15 years ago.

[@jimbo92107]

I feel uncertain, therefore I am. I think.

[@ArvinAsh]

Haha...that statement should be on a T-shirt!

[@mysmirandam.6618]

Good one

[@pohkeee]

🤨😯😳🤔🤓

[@rohitsingh-cc7uu]

@@ArvinAsh hii sir, can I get ur email address. I have all answerers of quantum mechanics which were wired I have also written a paper with proof but I need help to publish it where I publish it safely and in cost free journal.i have also ans of entanglement but I want not to waste my work because it is very important for my carrier.

[@bendix50]

I think therefore I am, I am therefore reality is.

[@DarthMalikify]

This is the best explanation of the delayed choice quantum eraser experiment.

[@MichaelRobinson_Revelation2]

Hello, Arvin! This is my first post to your channel, but I have been watching your videos for a long time. I LOVE the way you explain things, and I always enjoy the subject matter. I have been an amateur theoretical physicist since my late teens, studying a wide range of topics from possible warp fields (I wrote a theory very similar to Alcubierre's a couple years before him and kick myself all the time that I didn't push harder to get it published!) to quantum field theory. After watching the Delayed Choice Quantum Eraser video, a thought hit me that I wanted to share. I actually joined your channel with the full subscription JUST to be able to share this directly with you! The peculiarity of "spooky action at a distance" has always fascinated me, but spooky action before it happens really is exciting and intriguing. But while watching this, a simple thought occurred to me... from the photon's perspective, there is no time. A photon travels from one end of the universe to the other and beyond instantaneously from its own reference frame. So our reference frame's "notion" that a photon hits one detector "before" its entangled twin hits another detector is merely a construct of our point of view in 4-dimensional spacetime. To the photons, both photons always hit the detector at the same "time", but our being on this side of the looking glass means we have to "catch up" to the photon's experience. Now, this might seem overly simplistic as an explanation, but if you imagine yourself in the photon's reference frame, the two photons's wave functions will ALWAYS collapse at the same time... instantaneously. Every point in the universe is the same point when travelling at c. I don't know exactly how we will measure this phenomenon ourselves, but I've only had the idea for about 10 minutes. Thanks for your time and your wonderful and informative channel. It's always a pleasure to watch your videos!

[@ArvinAsh]

Hi Michael. Thanks so much for your support. I really appreciate it. And thanks for your thoughtful comment. I think the use of photons in this experiment may have thrown some people off. The problem is that even particles with mass, such as electrons would behave the same way. I think the prevailing explanation is that the entangled particles share the same wave function. And this wave function extends throughout space. It's like they are both part of the same train, so when one car goes one way, the connected car has to follow.

[@haritos90]

Still think this is the right direction, but you don’t need to be a photon (as it can only travel at the speed of light). With any set up in the experiment you can always have a frame of reference traveling at high speed which would disagree which of the detectors fired first - as long as the events are causally disconnected. In quantum mechanics it is really hard to judge what happens first if we consider only our frame of reference.

[@WeLoveMusicStudio]

I feel like there are some gaps in my understanding of this. Can I ask what kind of result would NOT be shocking?

[@JM-8899]

@@ArvinAsh For an electron, you could argue that the Poynting vector of its EM charge (photon again) could transport the information. For neutrinos (the only known particles without EM charge), interestingly, they are usually considered waves only because they are considered to be in a superposition of MASS states. Thus, the Higgs field might play this transport role.

[@hce2455]

I thought exactly same thing but Arvin's explaination makes sense.

[@waltz9230]

8:20 But I thought the closer you got to the speed of light the slower time goes and if you reach the speed of light time stops, right? So from our perspective some weird stuff is happening but really from the photon’s perspective it’s actually all happening at the same time? I’m not a physicist or anything I just watch these videos but that’s the first thing that came to my mind, what do you think?

[@ENEIDAR0CHA]

Nice! Maybe from the photon's perspective time is frozen into an eternal present, allowing it to perform all possible events at once....

[@waltz9230]

@@ENEIDAR0CHA I mean that's literally what relativity says so I don't know why they didn't take that into consideration. Or they probably did and I'm just stupid xd

[@calvinlee1127]

I think this happen to not only photon, some particals behave the same but not traveling at the speed of light.

[@aaroncurtis8545]

@@calvinlee1127 you are correct sir.

[@aaroncurtis8545]

As calvinlee said, it happens with particles too, reality is weird...

[@robotaholic]

I love intellectual honesty! Thank you sir for being intellectually honest and telling us when you don't know something. It is why I watch.

[@anishkulkarni8297]

Underrated comment

[@eskay3442]

He doesn't claim to know everything (religion) He encourages others to find the truth (science)

[@geckoo9190]

Yes, but I think that we all though the same, no one really knows the answer to that, if they did they may had the answer to reality itself.

[@everythingis2495]

Strength is admittance that we don’t have an answer rather then presenting opinion as fact to make it appear that way.

[@robotaholic]

@Greg Jacques you can't balance honesty either you're honest or not

[@blapty]

When I first heard about this from PBS spacetime I was intrigued but left feeling confused. Thank you Arvin for breaking this down for the rest of the class. 😁👍

[@ArvinAsh]

Thanks brother. Yeah, I love PBS spacetime, but they tend to explain things like everyone has a degree in theoretical physics. I want to remind people that complex science can be understood by everyone.

[@1024det]

Arvin explains this so much better. I love pbs spacetime but sometimes I feel that host tries to confuse me.

[@vladimirsch.3015]

You have described my exact thoughts.

[@darknez09240]

yeah very true i love pbs too but i am just no smart scientist, just a dumb regular person lol

[@leninsambhudat8553]

Sometimes the explanation really can't be understood unless you know or learn the fundamentals behind them. Analogies can only go so far and are always flawed in some way.

[@andrewwhite6]

Arvin, you are the MAN! I have struggled with this for so long. With the benefit of your brief presentation, I now understand the concepts and implications of this experiment. Thank you!

[@scottsherman5262]

No you don't! I barely do, & I'm wicked smot.

[@jboomhauer]

This is the first time I've seen this experiment explained in a way which is easily understandable (ie. I finally get it) . Subbed

[@leecrotty6344]

Could this theory be reversed and explain a theory of fate?

[@joyalsaju8878]

Me too

[@FranciscoBautista196]

Very clear explanation using slow motion animation. Thanks for this great video.

[@ArvinAsh]

Francisco Bautista Thanks my friend. See you in the next video.

[@FranciscoBautista196]

@Robert Pearce maybe you have not seen the double slit experiment and also quantum entanglement experiment. Those 2 experiments may make this clearer.

[@FranciscoBautista196]

@Robert Pearce Also R. Fridman said if you think you can understand QM you do not undestand QM. The experiments are very interesting tough. Peace my friend.

[@joemarz2264]

I was perfectly concentrated until 9:14. Then my thoughts were entangled.

[@rumayayad4361]

😂

[@stz03]

This dude was ahead of the game! #Entanglement is all the rage currently, so yes - the future from a month ago affects the current past that we exist in.

[@The_Revealer_7]

Laughing into the future

[@primovid]

I was going to say the exact same thing!

[@hikaroto2791]

HAHAHAHAHA

[@martinklopnof5284]

I think an important detail was left out, otherwise I like you to do this experiment: 1. Send a bunch of light into the machine. Enough to make a pattern, but not enough that it will reach the eraser before you turn it off. Wait for the light to finish hitting detector 1. 2. If an interference pattern is detected on the detector 1, remove the quantum eraser screens, so that the entangled particles will always go in detector 2 & 3, and therefore will reveal the which way information. 3. You now have interference pattern for particles. (This is probably impossible, but did he show us why?)

[@GetYossedLol]

I just tried explaining this to my mom and I realised I understood the concept really well from this and the quantum entanglement video! I explained to her using the example of 2 dices (dies idk) falling on 2 different level surfaces and somehow always adding up to the same number despite taking different time periods to go from superposition to a defined number value. Thanks again Arvin for helping me extend my knowledge and thinking capabilities. This really motivates me as I've always known that I was weak at Physics.

[@TranshumanistBCI]

This comment is underrated.

[@cosmopoiesecriandomundos7446]

1 die, 2 dice.

[@albertoguaruska7932]

U weren't weak at Physics. School was weak at getting ur attention at Physics. Not the same thing. Check out the book Deschooling Society, by Ivan Illich. I mean, if u get this video, ur not weak at physics.

[@cosmopoiesecriandomundos7446]

@@albertoguaruska7932 I partially disagree. The subjects taught at school were different. They also had to use math and numbers.

[@albertoguaruska7932]

@@cosmopoiesecriandomundos7446 And school sucks at teaching that too.

[@888888886690]

That is the best explanation I have found on KZbin by a million miles!! Thank you 🙌🏻

[@ArvinAsh]

Glad it was helpful!

[@NotDmitry]

This is the 3rd video I'm watching on this experiment. My understanding is in superposition between "Wait, I think I get it?" and "I have no idea how anything works". Great video tho

[@izzyangerman7604]

Bro, I just read a handful of comments and I have to say you are attracting love and respect cause I feel the same way Keep up the good work 💗

[@luwi4615]

Tomorrow is the new “Yesterday”😰

[@ratsface2814]

You're one of the best channels I follow. You cover so interesting topics which I also thought about many times. Thank you!

[@NoosaHeads]

The more I look into quantum physics, the more confused I get.

[@OG_HazelGrrl]

Me too...I wish I could wrap my brain around it :(

[@nihilisticboi3520]

@Greg Jacques may I know what degree you're pursuing, sir?

[@nihilisticboi3520]

@Greg Jacques okay. Your response tells you ain't pursuing physics or mathematics as a degree. I see no point to answer your question. Had you knew graduate level mathematics, you would've known the importance of quaternions at describing rotations is a better way. Even if quaternions doesn't explain anything (which is not the case), I don't see how it discards/opposes the idea that quantum mechanics is mathematical. To be honest, I'd give an advice. Read actual books on quantum mechanics and not Wikipedia articles or any pop-science articles.

[@nihilisticboi3520]

@Greg Jacques quantum isn't disproved by zeno's paradox. You don't even understand what quantum means in "Quantum Mechanics". On the other hand, zeno's paradox is not really a paradox. It can mathematically be explained. I'm telling you to go read an actual book on quantum mechanics. Griffith's book on Quantum Mechanics or Shankar's book on Quantum Mechanics are great. Please don't just randomly comment to look smart. You don't.

[@nihilisticboi3520]

@Greg Jacques quaternions have applications in computer graphics and have roles in simplifying three dimensional rotations. I don't understand your problem with it. Quaternions are just an extension to complex number system. I really don't understand how quaternions having no application in the field you want is a good argument on why studying QM with mathematics involved isn't worth it. I never claimed 4 dimensions are enough to explain string theory. I just said quaternions have roles in rotations. Honestly, don't even talk about string theories unless you have an excellent grasp on QM, advanced EM and SR/GR. Don't act like a twat. Stop reading pop-science and wiki articles and watching random KZbin videos, and claim yourself that you know these topics. These topics are so complex and deep that anybody except for physicists working on this field are not to be trusted. They're just physics version of quacks, and you seem one of them. Just stop with this and read QM by Griffith's and Shankar's to get a solid introductory grasp on QM. Be little sensible.

[@chiefmiester3801]

watching this high is extremely mind-blowing

[@4HK420]

Indeed

[@spider853]

That's why I like the multiverse interpretation, it just doesn't need an explanation why, it just exist in every configuration, all copies just experience it differently. Same we can see different results and because our conscionsness is based on cause and effect we just take the results in the verse we're in.

[@Parinmahomedriaz4184]

Yes true 👍

[@Bomba_drastic]

Same

[@rashedhashlamon7546]

It's difficult to experiment with psychedelics without ending up intrigued by quantum physics

[@Tom_Quixote]

@James King What makes you think so?

[@Aleksandrgrc]

Brains have natural dmt

[@wickedmagickal5388]

I'm over here with a joint following along..... maybe we do high wrong ?? Lmao

[@DirkLuijk]

Lol, thats so true. Dropped acid yesterday. Cannon stop thinking about the nature of time, biocentrism and subjective reality.

[@frederick909]

Or maybe the other way around

[@Raphael4722]

I'm absolutely gobsmacked by this video! Wasn't aware of this experiment before.

[@mikicerise6250]

The quantum eraser is a personal favourite of mine.

[@GaryTugan]

oooooohhh, good word.... "gobsmacked". I'm gonna borrow it! And perfect description for the affect created by watching and thinking (too much?) about this video and it's implications! :P

[@georgeskesseler]

I think this is the only delayed choice explanation which clearly explains all the necessary details to understand where the "problem" is, and what the eraser is actually doing. And you clearly see how important that part is, as the view graph shows a clear peak at 05:33

[@alexharvey9721]

That's actually the best video I've seen for clearly explaining the delayed choice quantum eraser, congrats and thank you! Light is necessarily timeless. It feels no time, like the event horizon of a black hole or anything travelling at the speed of light. What we observe is the same instant for the light along the causal path (path through spacetime along the light's world line). Causality is consistent and absolute, time and distance aren't as Einstein proved and change according to the observer, which is what makes this so confusing. So it doesn't matter how we observe it, the light (to itself) feels events simultaneously. We perceive the distance and time only because of our perspective as the observer. It's not possible for travel of information between the 2 destinations faster because the light already took the path of least action which is really the path of causality - so nothing could go backwards or be changed because what we really measured is causality, not space or time. Personally I feel like absolute determinism without locality makes the most sense. Then time going backwards or forwards is really the same thing and doesn't matter, it's just math. Everything we know about the universe runs on math and in math there is no such thing as randomness. Or.. something like that :P

[@ZX81v2]

"Time is an illusion. Lunchtime doubly so!" - Ford Prefect

[@matthewhall6288]

“Space and time are modes by which we think, not conditions under which we live.” -Albert Einstein

[@ronelgreaves6892]

Exactly

[@kennethcohen3051]

Our sensory experiences shape our interpretation of a vast, unfathomable reality that we either cower from of embrace with awe.

[@rickdelagarza4ever]

They are both, in which we think, and which we think. "I think, therefore I am." We are the universe, incarnate observing ourselves. We and all, are all connected. Entanglement of observation, by the observer of all= string theory.

[@piotrkupka2575]

Z

[@piotrkupka2575]

@mark emilio I just tried to copy the Einstein's sentence from above. Instead I made unwillingly my shortest youtube comment ever. If I really should comment this interesting video: I already thought since long time that we can change our future - according to which decisions are we making today - but now I could also imagine that those decisions have the power to influence our past as well. Or, since the entengelt particle at the detector 1 was faster then all the others, this one may have "decided" about what happens with the other particles by passing the 50/50 chance cristal so that the result at the detectors 2,3 and 4 would be like what we expect from a well mannered entengelment.

[@Dante02d12]

So basically: - We split a photon in half. - Each half takes a road, the first one is shorter than the second one. - The first result arrives first, since light speed is constant. - The first result actually _depends_ on the second result... which actually happens later. Now _that's_ mystic, lol. I don't think our perception of time is at fault here. We'd get this sort of mystery all the time otherwise. There's definitely something powerful happening in the fabric of spacetime, or "above" it. Is there a variation of this experiment where we let each entangled photon reach a screen after the "detectors"? Would we get the exact same result on both screens, no matter what? Great channel, by the way!

[@cadmar2969]

They're on the same planck frame. Does not matter if the future changes the past, or the past changes the future, except we are observing from our planck time frame.

[@PUMPADOUR]

The difference between the two detectors is way, way bigger than a plank of time...

[@cadmar2969]

@@PUMPADOUR From our perspective there is, but not on theirs. You are interchanging the two reference points. The entangled particle has their own reference point, and we have ours. In ours, the particles are detected on our different frames, but on their frame, it is still the same one.

[@Eric-xt8nd]

Cadmar, I order you to walk the Planck!

[@Eric-xt8nd]

Cadmar, I order you to walk the Planck!

[@cadmar2969]

@@Eric-xt8nd I shall walk the planck towards the Twistor Theory.

[@andersforsgren3806]

Hello there Arvin, thank you for a nice presentation. Not so shocking though, 'Experiments in time reversal' was published already in the 1950 where the authors did show a scenario where events would not unfold the same way when time were running forward or backwards. Simply put - by using a permanent magnet where the N and S sides are always the same. Then around 1975 CP violations were found for k0 mesons. The first one means that time indeed can be flexible on cause and effect, the second hints that nature can adjust itself on the nanoscale so that the final result come out 'right'. In short: The future do not quite affect the past, it only do a slight arrangement so that conclusion is consistent with the story and events of what happened before. Drat: Terry Pratchett did put it even better: "It take a moment for the overworked laws of causality to hurry to the scene to put things right."

[@silvithomas]

You presented it in a beautifully clear way. Thank you very much, Arvin

[@georgerevell5643]

This is easily the clearest explanation of this amazing phenomena I've heard yet.

[@justintime970]

I almost had it! I was soooo close!!!! Then you showed a young woman running thru a field....what was I thinking about again???

[@ardalanmoghaddam9346]

adhd? 😀

[@GaryTugan]

INDEED!!!

[@Evghenios79]

Just wonder how many significant inventions and engineering designs have been thwarted by young women running through fields...

[@b.michaelbrown1117]

The ending was golden 😁

[@js2010ish]

Seriously! A greatt metametaphor

[@172ngan8]

The end is not that of a golden. I mean the experiments has bias. The two path that he described was too short, so they're about the same. Try to make path #4 a MILLION times longer than the other path, and see if the idea of future could influence the past still hold, yeah right, see if the path #4 can send a signal quick enough back to change path #1

[@Aditya-yg1ce]

The concept of linear cause and effect just exploded in my face. 💥

[@mehreganghadiri]

hands down the best explanation of this experiment I've seen so far, thank you

[@philipberthiaume2314]

One of the best videos on the subject that I have seen. Thank you for posting this...

[@soundsculpturemusicalinstr3047]

Your channel is really amazing Arvin. This video in particular is the best on the quantum eraser effect I've seen. Off the charts GREAT! Keep up the fantastic work!

[@matthewsermons7247]

Entangled particles detect a collapse in wave function over distances in space "instantly"; time is just another aspect of space-time.

[@MrPHOOKPIG]

Exactly..

[@conscious_being]

True, but in this experiment, they have to detect it _before_ it happens for the outcome to make sense.

[@akhadr]

Local hidden variables.

[@TheEVEInspiration]

Thinking of time as a line is what gets people so at odds with quantum behavior I think (same with positions). Thinking of it as observer time, as in things do not exist unless observed, takes the magic away. Then it even becomes clear that the past is just a result from the first observation made by US (not the detectors), frozen in what we call reality. Observing of the "measured" results by US, is the true moment the whole setup is evaluated and is so, instantly (not taking any time as we know it). At this point reality is formed, the particle is not in super-position, but has taken a path and both path lengths are exactly zero. This could actually be hard proof we are living in a simulation! Mystery solved.

[@Dashman100]

@@TheEVEInspiration Finally Satisfied...! But usually the recorded measurements are at larger scale, there quantum world will not apply...!!! Once recorded at that time cant change even we observe

[@drshahneal]

Love your videos Avinash. This experiment has important medical implications when thinking about cause and effect of diseases. My understanding is that there is nothing like past and future, they are all existing simultaneously, just that information is moving causing illusion of time. So called future already exists and the screen 1 can access it through higher dimensions of entanglement and modify accordingly. It is similar to one imagining a happy future of oneself, creating a happy present.

[@sasukerinnegan6787]

Very interesting indeed. I was thinking that if time is relative to the observer. So maybe quantum particles simply don’t observe time? Maybe to the photon, both particles hit at the same time

[@JustMe-vz3wd]

@@sasukerinnegan6787 hey i just did write that. isnt it that photons (light) doesnt experience time? from their viewpoint it happens simultaneously. arent there other videos about relativity theory that describe that for one observer two events happen after eachother while another observer (traveling close to the speed of light) sees the events simultaneously, and BOTH viewpoints are correct.

[@surajtiwari2614]

Probably, best video on the internet on this topic!

[@Michiganmayor420]

I know this. From lights perspective everything is instant. When a photon leaves that quasar, by the time it gets to earth, according to it's own perspective. No time has passed at all

[@braaaaaaaaaaaaaains]

That actually makes sense.

[@samtree99]

Thanks Arvin. The key part was the delay (longer path, slow motion to show past vs future). This was what most of other KZbin videos on this subject are missing. You made it clear. Good job and thank you!

[@timothysparks6949]

This was an amazing explanation! Thank you! And the background music kept me thoroughly engaged 😭😂

[@VagueHandWaving]

Of course "the past was changed" is an unfalsifiable claim as the future of the changed past is what we are experiencing now and not the future of the original past. A comparison would have to be made between the two futures, but it is impossible to experience both.

[@kcarrier59]

The past, present, and future are inextricably linked like a chain. An oscillation at the future end of the chain will ripple backwards into the past and vice versa.

[@thekids7964]

Kim Carriere But how could we ever observe and measure such a thing?

[@hueyreddi1847]

@@thekids7964 good question. If you were to put detector 1 on a farther path than the other detectors it could easily become the future outcome being guessed by detector 2,3 & 4. 🤔🤯

[@DavidHeizer]

Perhaps the word "determined" should be used instead. The point is that the character of the measurement in the past is determined by the measurement in the future.

[@EduFernandes21]

I got that! I'm so happy! Because finally I understood this very interesting experiment. It's so amazing!

[@moazim1993]

the cuts at the end tripped me out. I thought it was me and not the editing

[@rayluca123]

What cuts?😀

[@ihsahnakerfeldt9280]

@@rayluca123 I was going to write that too damn haha

[@dustinhayes2623]

Came here looking for an explanation of Wheeler's delayed-choice experiment in English instead of science. Thank you for explaining it so thoroughly yet so simply.

[@cyruskalali8222]

That was why I delayed the choice of a new wife until I was 60.

[@ArvinAsh]

Smart man!

[@SpiralSniperz]

Arvin Ash how does the photon ‘know’ if the which way information is known or not?

[@slapmeisterrecords8226]

Double slit experiments tend to be more fun if the which path is not determined yet

[@SpiralSniperz]

SlapMeister Records how does the photon know when to act as a photon and when not to?

[@slapmeisterrecords8226]

@@SpiralSniperz a good question...for another time. Dean Radin has done some work on this. I am not totally convinced but his approach is rigidly scientific. Maybe you find your answer there?

[@ΧρήστοςΑποστόλου-ψ1φ]

I watched this at 4 am and A SHIVER RUN DOWN MY SPINE.

[@RasperHelpdesk]

So if Detector 1 says "particle" we know that when the photon hits the splitter it will randomly pass through to Detector 2/3 and when Detector 1 says "wave" we know it randomly reflected into Detector 4. If we remove Detector 2-4, then Detector 1 should always say "wave" as the directionality is never measured. If both of those statements are accurate, then what if we set it up so that if Detector 1 says "particle" we disengage Detectors 2-4, thus forcing it to become "wave", and if it says "wave" we just remove the splitter so the photon hits 2 or 3, thus forcing it to be a particle? Would that not force a paradox?

[@tibormalinsky8751]

This is an interesting thought. Unfortunately I’m not able to tell you yes/no. But whilst I have only very little knowledge, I say yes.

[@oracle7858]

my brain hurts :(

[@geoffreytylerpayne]

It always knows what you end up doing.... in other words... detector one could never say "particle" if you are planning to disengage detector 2-4

[@tristancavallero1620]

First of, quantum stuff are crazy and nobody understand it completely and clearly not me. But from what I know, photons move at the speed of light so photons don't take time to move. For a photon going anywhere takes no time (like really zero time). The whole problem with this video and most likely with this experiment is that it is entirely based on the fact that here time matter for the photons, which is (for me) a mistake. Also, i would like to invite you to look up string theory. Basically, most people consider photons as particules (or waves) which means one photon can only be at one place at a time. String theory tells us that photons are strings and that means that photons don't travel from a point A to a point B but that the entire distance from A to B, so a line or a string (cause not always straight), is the photon. Considering the problem with Time and the string theory, the entire experiment and the paradox disappear.

[@nicolasargon1436]

@@tristancavallero1620 I hadn't considered the time dilation effect of light speed. How does the experiment account for 0time being 'experienced' by the photon throughout the experiment. That the photon was measured from our perspective in a delayed way may suggest nothing at all about the photon from its 'perspective' so to speak as it travels through the experiment. I thought about it in terms of the measurement problem.Without a solid understanding as to what constitutes a 'measurement' in QM can we really ascribe the 'delayed' qualifier to the experiment? What is doing the collapsing of the wavefunction, or more precisely, how can we be sure to have eliminates all other possible 'observers' which could collapse it? Wonder what you think? Also I hear a lot of dismissals of string theory from my information diet, could you speak more on string theory? How does that model of reality differ from QM? And what sorts of propositions does it entertain? Thanks!

[@subbhana6511]

my heart flutters at the thought of a very mysterious quantum world very good explanation sir, Thanks.

[@maiaallman4635]

Thank you very much Arvin! I have been looking so long for a channel that explains quantum physics in a way that is understandable to me. I will watch all your videos.

[@SrmthfgRockLee]

pbs spacetime is good too, seeker, kurzgesagt, vsauce

[@whycanismellcatfood]

Question: if time is 0 for a photon moving at the speed of light does the distance difference between source and detector matter?

[@almclaug2]

Good point - and if the detectors (2&3&4) without the eraser were separated by a couple of light years (from detector 1) from the one with the "interference" eraser, then would you get the same consistent wave or particle type result at all detectors?

[@whycanismellcatfood]

@@almclaug2 or a couple of billion light years ....

[@FabianoRonaldo777]

Even traveling billions of light years is instantaneous for that photon travelling at the speed of light.. it is only to us on Earth that it appears to take billions of years to get there. Time is relative.

[@WideCuriosity]

Ah, just added a similar comment. Different frames of reference. Suggests to me that we don't yet understand time, when such apparent contradictions occur. Perhaps each apparent moment has no past of future, only the line one can imagine joining a multitude of moments up give the impression of passing time.

[@jewelsonguinabo5472]

Good hypothesis.. but these wave-particle duality also shows up with electrons and some molecules

[@badhombre4942]

Hmm..so the future influences the past. Well, let's put that to the test. Give me the Nobel prize and I'll have the answer for you yesterday.

[@riadkhan9798]

That's a Good damn answer 😂😂😂.

[@greenlizard920]

Very chiky broh. ...

[@euanlankybombamccombie6015]

tomorrow never knows what it doesnt know to soon...and in the past the nobel prize is called the quantum sharer....multiple people can own it at either side of globe simultaneously at the same time

[@anandsuralkar2947]

Lol

[@TheEVEInspiration]

That is the wrong way to look at it. There is no past without observer time! We are observing mere "echo's" of current reality...which we call past.

[@edholohan]

This is blowing my mind, dude!!!

[@ErinRaciell]

Superb explanation! Thank you so much for this video!

[@ogbrown1073]

So basicly... you never stole something if you never get caught...

[@Hood.Housekeeping]

Rape joke?

[@lh1690]

An alternative explanation is that the future is already set and the photon has prior knowledge of it.

[@braaaaaaaaaaaaaains]

@@afaron83 I don't think that your logic makes much sense. Isn't the entire point of a simulation to have it follow set rules, thus pre-determining the result, despite the result being unknown before the calculations ? Maybe the whole path of a photon and its eventual arrival are calculated immediately using something like an insanely advanced quantum computer. Quantum computers don't seem to require calculating things step by step but basically arrive at the answer to a given calculation immediately, they only have to have a sufficient number of entangled qbits to actually fit the question. A quantum computer simulation of our reality would require an absolutely unimaginably large amount of entangled qbits.

[@darkemperor3399]

No future is not predetermined heisneberg proved this with his principle. So predetermined future is not an explanation. It is something that we do not yer understand.

[@lh1690]

@@darkemperor3399 Heisenberg only states that the exact position and momentum of an object can't be accurately determined. Light is perhaps just a projector that brings the predetermined reality into being. Let's face it, the interference pattern emerges before the entangled photon hits any detector and after it emerges, you know what detector it's entangled pair will hit in advance.

[@Moreoverover]

@@darkemperor3399 Maybe the universe is made in such a way that the universe can predict everything (because it's predetermined) but makes it so that it's beings can't 100% predict anything.

[@antonystringfellow5152]

Pretty much what I was thinking - everything is set - the future and the past, and time is just an illusion (as Einstein himself once said). If so, then we really have no free will, as we believe we do. It just wouldn't be possible. I find that hard to believe but it does seem the simplest and most obvious explanation. I seriously doubt it though. I mean, if everything is fixed and we have no free will, why do we have awareness that helps our minds make complex decisions? Damn strange, whatever the truth of it.

[@skylineuk1485]

Is it possible to lengthen the distances to detectors d2, d3, d4 and then use the result from d1 to change the mirrors to the opposite in retrospect of what should have been the outcome, creating a time loop?

[@MrRight1000]

“Dead yesterdays and unborn tomorrows, why fret about it, if today be sweet.” -- Omar Khayyam, 11th Century AD ... perhaps yesterdays are not as dead as Omar reckoned ;)

[@wrOngplan3t]

"Marty it's perfect! Your're just not thinking fourth dimensionally!" 2 questions comes to mind: 1 - If possible - What happens if you can control the "50% beam splitter" (or rather some other controllable splitter) AFTER getting Detector 1's result, but force the photons into the other detector(s) than what the result indicates? (Would you get a... time paradox? Tilly from Star Trek is right, things sounds cooler with "time" in front of them :P). 2 - if possible (again), do the same experiment with other particles than photons, say electrons (or other heavier than light particles). I don't know if one can get entangled electrons similarly as in this experiment, which would be necessary, but if it's possible it could be interesting if the results are the same, or not. Afaik, light doesn't really experience time since they travel at the speed of, well, light. But electrons don't travel at that speed.

[@dinkledankle]

Like photons, electrons exhibit wave-particle duality, as well as most other particles. And like electrons and photons, most other particles behave similarly in the double-slit experiment. Here's a wiki article if you want to read about it. en.wikipedia.org/wiki/Wave-particle_duality#Wave_nature_of_large_objects

[@JacobReiter1]

Yes but the speed of light actual light is not constant, even in a vacuum. The speed of causality is constant

[@ClariceAust]

@@JacobReiter1 Or seemed to be, before this experiment..

[@kalokajoe357]

Nothing happens. You dont know the results until you travel with all detections and compare. Your screen will be a mess of dots until you separate them to show which is which.

[@tophers3756]

The term "quantum eraser" sounds like something Douglas Adams would invent.

[@Lara__]

Question: If we check the pattern of Detector 1 and then using the knowledge we force the path of light to go to the opposite detectors, what happens? We know Detector 2, 3, 4 are hit much later than Detector 1, so didn't anyone try this?

[@mohannd1234]

Nice idea, like when detector 1 activates, using specialized mirrors, we change the direction of the photon to the other detectors. I like the idea

[@nebky]

Detector one never changes its overall reading, unlike what's implied in this video. If you replaced detector one with a card so you could visually see the light then nothing would change when you "switched" between the other detectors - although no switching is actually happening in the experiment, the light is simply split and the switching happens via selective observation of data after the fact. What gets observed via detector one is only the entangled photons you choose to observe based on their pair received by the other detectors, the others photons are filtered out of the data ( by a separate device connected between the detectors, shown in the diagram early in the video). Essentially what's happening is there's two patterns overlaying on detector one. If we read half of all the photons from both slits by checking for entanglement with detector 4 you observe a wave as you'd expect. But if you only choose to look at the other half by each slit individually using detectors 2 & 3 you don't see this overlap and they appear as two sets of particles. Thing is, If you combined 2 & 3's data you'd observe a wave again and if you combined 2, 3 and 4's you'd observe essentially the same as 1. So no time breaking nonsense going on at all, just confusion I'm afraid 😂

[@TheMariusDarkwolf]

My thought on this, is BECAUSE they are entangled it's possible that that the photon measured by detector 1 determines which path the entangled photon takes. ie Photon 1 displays as wave, forces the entangled photon to take path 4, if photon 1 displays as particle, it forces entangled photon 2 to take either path 2 or 3 depending on the slit it passed through. The reason for this hypothesis is that we have evidence that entangled quanta effect each other, ergo Occam's Razor (the simplest answer is usually right), when the first photon is measured, it causes it's entangled mate to take the matching path. This avoids issues of temporal paradox, and causality. The sad thing is that I've got no issues with the possibility of time travel, and love the concept but that's obviously (to me) not what's happening

[@jjhhandk3974]

So what if you removed the mirror instantly after receiving an interference pattern at detector 1?

[@mmaxeator]

@@jjhhandk3974 Exactly ! But you should be faster than light to do that :-) Or somehow slow down the photons and use electrochromatic mirror. Or I may have an another idea....

[@jjhhandk3974]

@@mmaxeator nah you can make the path for the other photon as long as you want.

[@SamGarcia]

it's not very clear how the light passes through the slit through probability (what I mean is, is it the photon or the slit that is causing the chance?)

[@Gwunderi25]

"if photon 1 displays as particle, it forces entangled photon 2 to take either path 2 or 3 …" Your premise doesn't work, as the photons detected by detector 1 alone could never "display as particle" (stripe pattern), they would always show an interference pattern as the lens acts as an eraser that erases the "which-way-information".

[@georgekraft1401]

Why does quantum physics always make my brain hurt?

[@arcaneiconoclast319]

because if you understand it you become a god

[@kevinl8440]

Human brain isnt setup to grasp this stuff. It's mostly optimized for finding resources and fcking.

[@ErinRaciell]

Because things are and aren’t at the same time 💁‍♀️

[@albejaine]

@@ihoopdaily ah, yea; god was always trying to keep humans from gaining knowledge. I'm not sure if it is because of the fear that one day, we would become so self reliant, that he would no longer be needed, and as result, seize to exist.

[@BaconNCereal]

Albern Newton Or we cant possibly grasp it due to our biology

[@judithhoster4024]

This is amazing!!!! Coming from a totally different background, I sense that this has to be right! I am so glad that there are people who are scientifically following their instinct to find the truth that is hidden deep down...

[@kennilesh2000]

Thanks for taking advanced science to my home. Mind-blowing content on your channel. Awesome job👍

[@leaturk11]

I thought photons travel at the speed of light, and if you travel at the speed of light; time stops for the traveling photons, if this is so; the photons time aspect is irrelevant as they are entangled. Or I'm I missing the point?

[@tedl7538]

Yes, William, without being a physicist I can say with absolute certainty that you're missing the point, because if the explanation were that easy and obvious then this video, which is based on the current level of scientific understanding, would not exist.

[@dannybolton4053]

Dare I say it..God knows

[@TysonJensen]

Time stops but no one ever said causality should be suspended. Imagine detectors 3 and 4 are billions of light years away, and we can move them around freely deciding at the last possible instant. The image at 1 already shows and has shown for billions of years what we will choose.

[@mina0rahman]

I was thinking the same.

[@General-Sun-Tzu]

I was thinking the same thing.

[@stevoplex]

I'm waiting for the quantum eraser to come out in a convenient app for my smartphone, and use it to undo my stupid decisions I've made.

[@ArvinAsh]

That would make a good premise for a sci fi movie.

[@GJ-dj4jx]

Or become rich? Theoretically you can loop one of the entangled photons and the next day collapse the wave function if lets say a stock of your choosing goes up ;)

[@ChallengeTheNarrative]

Well that's another interesting conundrum. Are we in complete control of our decisions? If not, what environmental factors effect the reformation of neural pathways. Then that leads to huge social implications... the dreadful legal system. Morality etc. Off topic. But there we go.

[@imac1957]

@@GJ-dj4jx Actually no. You can't communicate information back in time. You can only have an instantaneous decision appear to be happening at two different times in a different time line. This is a very different situation.

[@ElectronicCalifornia]

Watch Dark on Netflix for the most MINDBLOWING time travel series, it explores the idea of the future influencing the past. The complexity in the narrative is bigger than Primer!

[@Geckobane]

Just finished Travelers on Netflix, which plays loose with causality but is interesting. I'll have to check out Dark. I actually think the Avengers movie explained time travel and branching better than most.

[@justintime970]

Your pic reminds me of that dirty Sanchez my wife gave me last night...

[@frederick909]

You're right! That's what brought me to these videos!

[@adamrspears1981]

Thanks Arvin Ash! Maybe the key to better understanding this, is to keep in mind that a Photon's Past, Present & Future is, to itself, indistinguishable. So maybe, it could be that it doesn't matter that, from a conscious observer's frame of reference, that the photon seems to know..... because the photo has paths of different lengths, but doesn't expetience time the same that the conscious observer does. ....This is a *very* interesting experiment & I hope I am around to find out its explanation. Thanks for another Great Video, Sir!!!!

[@samguivine3267]

Without having looked it up, I'd venture a guess that it also works with electrons, which do have mass?

[@AbbyRuston]

I love the way you said "it could be that it doesn't matter" like the photon isn't concerned with time, but us humans are absolutely stressing about it.. which is funny bc what we are stressed about has to do with the observation of those photon's who don't care about time in participle form 😂😳🤯

[@adamrspears1981]

@@samguivine3267 I'm inclined to say "no" because the electron doesn't move at the speed of light, aka the speed of causality. -This is because the photon has mass.

[@jtem9313]

@@samguivine3267 They don't experience space either. There is no distance between them and any of the points. So, to the photons they never traveled further and no time went by what so ever. There is no magic.

[@Cilar1728]

Why arent we searching for band patterns throughout the universe, to see if somebody, or something, already collided the probability wave of a photon? Is it even possible?

[@james4289]

This perfectly explains the mandela effect. Makes you wonder if the past is fluid and changing with us.

[@redwaldcuthberting7195]

False memories perfectly explain the Mandela Effect.

[@KenPotter]

@@redwaldcuthberting7195 EXACTLY!!! All Mandela Effects are very trivial counter-intuitive facts replaced by a more intuitive memory. For example, "Sex in the City" is more intuitive and easier to say than the factual "Sex AND the City".

[@bjornarsimonsen7592]

But he's dead now, right? Or is he still still alive?

[@skinnybear5743]

@S C D wave computer is being used, research CERN, Everytime they rev up their magnets it affects the Earth's core (heartbeat) which used to beat at 3 mhtz (don't know if I spelled it right,) but now it is beating at 12 mhtz, which affects the magnetic field and frequencies. Here's some science for you.

[@P4melaMasters]

Yes, I believe its false memories. The only one I can't explain though is Jaws girlfriend braces in James bond.

[@blckbldng]

me: give my beer back me : hold my beer

[@tiller8329]

Doesn't a photon, traveling at the speed of light, experience all time simultaneously? In another analogy, the length contraction of the universe at the speed of light would mean that both detector paths, in the perspective of the photon, have zero length. I wonder if the same results would arise using a particle with mass. Maybe an electron beam.

[@BJohn429]

Agreed: As per gen. relativity, time stands still at light speed for both the wave function probability set as well as a particle. Because some time passes only to the observer in this experiment and no time passes for any of the F of ( w ) function one or either does not reach an indicator later than the other. It is only an observation of a future event that amperes to reach the indicators as being the determinant factor, and not the actual event itself.

[@zcai2672]

I think the same effect have been demonstrated on larger molecules travels much slower than speed of light also.