Young's double-slit experiment, evolution of the phase

This new episode of our #shorts shows the solution of Schrödinger's equation for a quantum particle moving towards, and partly through, a double slit. It shows the same evolution as the video • #shorts: Young's doubl... but with a different color scheme. The luminosity represents the probability density of finding the particle at a given place (modulus of the wave function squared), while the rainbow-colored hues represent the phase, or argument, of the wave function. The initial state is a Gaussian wave packet with a momentum directed to the right. Here the simulation uses Dirichlet boundary conditions, meaning that the particle is also confined to the square box around the displayed area. Apart from that, this is a shorter remake of the video • Young's double-slit ex... with better resolution.
Music: Epic Unease by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 licence. creativecommons.org/licenses/...
Source: incompetech.com/music/royalty-...
Artist: incompetech.com/
The simulation solves the Schrödinger equation by discretization.
The C code is available on github.com/nilsberglund-orlea...
www.idpoisson.fr/berglund/sof...
Many thanks to my colleague Marco Mancini for helping me to accelerate my code!
You may be interested in some science outreach articles: images.math.cnrs.fr/_Berglund...

[@UshaKumari-of7ix]

watching short before exam😂😂

[@themusicway...129]

Neet near

[@Diner_Nur]

bro me too😂

[@littlehijabi390]

Me too😂

[@s.d._.56]

معكم ✌✌

[@shaikamjath796]

Me also 😂😂

[@horizon.amv06]

The boss fight music makes the phenomenon even more epic!

[@apkhackwithpc2]

True

[@AdrianBoyko]

It’s funny how seeing the double slit experiment drawn dozens of times (by dozens of different people) conditions one to think that the photon ALWAYS passes through one slit or the other. This visualization is great because it makes it so obvious that the photon is actually going to bounce back off the wall, most of the time!

[@trevorstrope4549]

Is light a photon though tbh it really just looks like if you splashed in the water how the waves would move, and we do call it a wave. So is it possible light isn't really anything else except the special waves created by something disturbing it's surrounding and constantly creating just tidal waves through space

[@battlesheep2552]

@@trevorstrope4549 it's both. It's behavior is mostly wave-like, but the photoelectric effect proves it exists as discrete particles.

[@physics_enthusiast_Soorya]

Hipity hopty that's not your potty

[@midnightrider1100]

@@battlesheep2552 perhaps we should not think of electromagnetic particles as either a wave, a particle, or both. They just are what they are. They are a massless probability characterized by a wave.

[@kiraPh1234k]

​@@battlesheep2552 Interaction in discrete packets is not actually proof of particles.

[@noahclarke9615]

When the final boss is a wave

[@mehdilee]

And it's literally joking with us 💀

[@IliLav]

Lmao

[@mosadr7339]

رحمه الله والديك على هذا الفديو هسه اتضحت الأمور أكثر .❤❤

[@AdityaSharma-pf6ru]

Bas now this shit is clear in my mind

[@smartguy6576]

background music matters

[@lemaypereira8498]

One of the most simple yet exciting experiments ever

[@ralala4096]

I wouldn’t believe that this is a wave. Has anyone ever tried other conditions for this experiment ? Because internet rn it is just full of the same explanation and “we don’t knows”

[@comicalhawkwatch2995]

U Just made it clear man , thanks a lot . May u live long.😌😌

[@kasuha]

Seeing this, I think it would be very interesting to see the evolution in quantum eraser experiment. Though I guess it may be too complicated to simulate.

[@NilsBerglund]

Probably, yes... but maybe I'll be able to get to more complicated things with more experience. Thanks anyway!

[@blinded6502]

Holy hell, that's such a neat idea. But yeah, it'd be quite complicated to replicate in detail

[@wafikiri_]

The quantum eraser experiment was debunked, according to Dr. Sabine Hossenfelder's science news.

[@user-zz8jv7vv4w]

What interests me is how we can see another fringe on the left side and explain it with Babinet’s principle.

[@KitagumaIgen]

One detail for everyone to notice in this simulation is the phase-shift between the central maxima and the neighbouring peaks! (That was something that "came as a surprise" for us starting on an aperture synthesis imaging application - when we thought it through it became obvious)

[@NilsBerglund]

Good point, thanks!

[@john.john.johnny]

@@NilsBerglund Nils say hi

[@user-wr8ov7ki7f]

be it physics ,chemistry or bio when you see the phenomenon or processes practically then it seems incredible

[@vru6431]

Beautiful

[@NilsBerglund]

Thank you!

[@vru6431]

@@NilsBerglund I only read and saw static pictures of wave nature. I can feel better now of how physicists felt when they have to make peace with the thought that light was both a particle and a packet of wave at the same time. Looking at this short video I can appreciate a bit better of those men who came before us and tackled the challenging questions of time.

[@jayaram5166]

Coherent source

[@unknotmiguel]

Hey everyone,I recently stumbled upon a fascinating thought experiment and I can't stop thinking about it. Imagine you have two sets of light waves, perfectly aligned so that their interference patterns cancel each other out completely. Yes, like, they're set up in such a way that every peak from one matches a trough from the other, resulting in... well, no light at all in the area where they overlap.This raises a huge question: If the light is perfectly cancelled, what happens to the energy? According to everything we know about physics, energy can't just disappear. But in this experiment, where we're seeing total cancellation, where does the energy from the light waves actually go?Does this challenge our current understanding of energy conservation? Or is there a straightforward explanation we're missing? Would love to hear your thoughts and theories on this!

[@NilsBerglund]

Energy is conserved globally, but not locally. You may be able to create a region where destructive interference is perfect, but if you started from a wave with nonzero energy, that energy will have to go somewhere outside the region with destructive interference.

[@amandeora7044]

Killer visualisation

[@itsme...1913]

I love how the musice is super dramatic 😭

[@programmingpanda102]

would love to know what would happen if you added another slit

[@aryar6970]

OmD that backscore hits hard

[@multaqaadil8410]

يونك وطلاب الخاقاني 😁👏

[@harshyoutuber1698]

Video is related with study but it's sound is seems to be very frightened ☠️ when you plugged earphone 🎧

[@sharanyashaw901]

This is really awesome 👌 👏

[@NilsBerglund]

Thank you so much 😀

[@nirajsinghnirajsingh465]

Thanks for this experiment very usefull for me 🔥😊

[@eraktopus3631]

this makes shining light through two holes feel like the armageddon

[@Sumitchaudhary5525]

Loved it ❤

[@rajvanshiaditya]

Magnificent

[@utkarshsharma9563]

Can you do the same for an oblique wavefront and one where one of the slits is covered by a slab of different refractive index?

[@NilsBerglund]

Probably. Changing the initial state is easy. To represent the quantum analogue of a different refractive index, I suppose a natural thing to do is to introduce a positive but finite potential in the lower slit. Do you know what to expect?

[@utkarshsharma9563]

@@NilsBerglund if the slab has thickness t, then the wave coming from the slit with the slab will acquire a path difference of n(t-1) where n is the slab's refractive index. So the pattern on the screen shifts by that much in the other direction

[@cravedforsuccess]

@@utkarshsharma9563 bro watch alakh sir lecture he explained this

[@z.b5m]

تجربه شقي يونك شرح سريع للضاهرة استعمل يونك حاجز ذي شق ضيق اضيء بضوء احادي للون ثم سقط الضوء على جاجز ذي شقين ضيقين متماثلين يدعى باشق المزدوج

[@Parkjimin13135]

طالبة سادس؟

[@sarveshpandey279]

The BGM 🔥

[@juanpablogo7091]

EL EXPERIMENTO DE LA DOBLE RENDIJA!!!!!!🔥😻

[@HimanshuGiri-xb1sg]

Best explanation ever that wave nature of light

[@worldinhand63]

Raat k 2 bje padh rii thi lamp music n poora dhyan bhatka diya ab jaa rii sone😅

[@obitouchiya3394]

lol!!!

[@OrganistjamesKtZ]

Good one 😊

[@aclearlight]

Gorgeous! BRAVO!

[@NilsBerglund]

Thank you very much!

[@gamingwithvithun4672]

The music makes the video more interesting

[@pranali2218]

This is impressive!!

[@vedantvaibhav9650]

Nice demonstration.

[@NilsBerglund]

Thank you!

[@vedantvaibhav9650]

@@NilsBerglund by the from which country you are?

[@NilsBerglund]

It's a bit complicated 😉. I am currently based in France, but I grew up in Switzerland, and my parents came from Sweden and Germany.

[@vedantvaibhav9650]

@@NilsBerglund waooo what the combination! Do you work on physics demonstrations and physics learning,then I too need a company with whom I can discuss the problems of physics.So for that if you agree can you tell me how can I contact you personally? It would really be a great experience working together.

[@sallysolomon3191]

Thanks a lot 🙏

[@NilsBerglund]

You're most welcome

[@VEGETA285]

Thankx

[@boydmaddocks838]

Brilliant demonstration!

[@vigyanamit]

Sahi bola bhai Lakin maine ise practically karke apne KZbin channel pe upload kiya hai Jake dekh lo😂

[@ansuyagohel825]

Really gives feel

[@vasanthisuperkaruna3407]

The visual is cool!

[@binary8897]

hecker bhai hecker 🔥😈

[@lowkeyben]

I need this

[@Alexander_Sannikov]

how does a wave packet keep its shape while propagating?

[@NilsBerglund]

I took a Gaussian wave packet as initial state. While it will eventually spread, I guess the time interval used here is too short to notice the effect...

[@hrishabhsharma8871]

Double slit 😇😇a amazing experiment

[@alexandregrezzidemirandasc1393]

It seems Bernd Thaller simulations on Visual Quantum Mechanics. They are very nice.

[@egghead55425]

very nice!!

[@bp495599]

Good stuff, could you please add a detector to one of your videos and show the wavefront collapsing?

[@mrdownboy]

Quite the request

[@ajinsights2841]

Wonderful

[@NilsBerglund]

Thank you! Cheers!

[@kyototo.]

Excellent renders。

[@NilsBerglund]

Thank you!

[@shivanshofficial0015]

I understand, thanks❤

[@NilsBerglund]

No problem 😊

[@yashaseri8550]

Sounds like avengers😮😮

[@wiretrees]

well done sir

[@NilsBerglund]

Thx!

[@mattstaab6399]

impressive

[@Anonymous-8080]

Photons be like: When nobody is watching me,I shall unveil my true form. 😅😅

[@mrEofPlanetEarth]

Oooh..this is awesome! Here's an idea. Can you do one of a measuring device collapsing the wave function?

[@NilsBerglund]

Thanks! I'm kind of hoping that once this video hits 1 million view, the wave function will collapse. But jokes aside, modelling a measuring device is no easy thing, I even think that problem has yet to be solved in a satisfactory manner.

[@AbdullahKA1]

Young expiriment

[@alkishadjinicolaou5831]

Do the other part where you put an observer and the interference pattern disappear!

[@popaysailerman5193]

My eyes are rolling while seeing it

[@MrOvipare]

Grandiose!

[@WillBraks]

Double slit experiment showed that there was a wave function and a wave function collapse. Very well 👍

[@onlyrawan8170]

طالبة علي الخاقاني مرت من هنا 😎❤️

[@rickya9676]

awesome

[@mashamellish3455]

Sir itna scary music Ku lagya ha bahi . Exams sy ik week phly Dekh rhi hon phly DAAR laga howa ab Issy Dekh k mazed lag rha

[@unknownuser4816]

What is this language even?

[@retajmuhannad9517]

#علي_الخاقاني 🌚❤️

[@sayori3939]

That was scary

[@matrixiad1517]

We can see how bright and dark Fringes are formed.

[@itszayo2201]

سوادس موجودين لو بس اني اهنا

[@Xbanana4]

في كل مكان

[@shivabhishekyadav1960]

Mind blowing

[@NilsBerglund]

There is no a 3D rendering here: kzbin.info/www/bejne/aIWqi2Wwgpmhes0

[@sasuke_uchiha91]

Patient level 📈

[@DrAnkitJangid]

Oh wow..great

[@ellalou2105]

What would be the math of all the waves of light interacting??

[@NilsBerglund]

That would be Schrödinger's equation - you can search for it online.

[@YouTubecreation001]

We are approaching towards blackhole🤣🤣

[@wijdanwij4378]

Interference pattern

[@radinelaj3932]

I think if that experiment would be replaced with a canon sand( not laser canon) would happen the same thing. It means : the experiment doesn't show anything because sand is particle, that( same thing ) would happen with all things as : water, sugar grain,salt grain, sand grain etc...( the photon doesn t interfere with itself but crashes with border of slit part (ricocheted the lips/borders of the slit ).

[@husseinali-ij5ui]

الجاي من علي فلاح الخاقاني لايك🤣♥️

[@mickblock]

So are the version of the experiment where 1 particle at a time makes the interference pattern, and the one where it changes when observed just fabrications or misrepresentations?

[@NilsBerglund]

No, I don't think they are. This simulation illustrates an evolution governed by the Schrödinger equation, when there is no observation at all. Our version of quantum mechanics that best explains experiments states that making observations collapses the wave function, and that is compatible with many independent similar experiments reconstructing the interference pattern. I can understand that people dislike wave packet reduction, but I'm not aware of any better model.

[@trainertaylor5396]

This was on my recommended. Can someone explain the experiment please? Seems interesting

[@Raj_singh_Rawal]

It makes sense by water but with light it's can't imagine

[@Xbanana4]

طلاب علي فلاح 🏃🏻‍♀️

[@Esraa-al3na]

Try to shake your phones right and left while watching

[@jksv4977]

Wt a dangerous bgm ha😱😱

[@user-cmcumm]

yeeeaaa music from world conqueror 3

[@tartelat_quran]

ثانوية عامة العراق 🇮🇶

[@moamelm]

عاش

[@sarveshphysco176]

Suepr visualization

[@tegapis6716]

Only 26m and already in recommandations... WTF KZbin

[@krozaggaming]

What if we put a hole in the middle portion between the slits

[@boq90]

_طالبـه سادس🎉❤_

[@edgartovar2200]

What if the obstruction is able to allow the whole by rotating see that makes

[@Sumpydumpert]

Wow

[@sujoydevnath8717]

Researchers: Actually this is illusion, the wave is static 🤦‍🐸

[@Idealbruda]

Bro where's the screen forgot to put it 😅😂

[@mohamedmotaoa-py3le]

What this light .watchin before fill exams

[@bleachdrinker69]

I remember having to learn about this a while back and hating every second of it

[@citrus6507]

Me rn

[@footballforyou7350]

when you start doing numerical 🗿🗿🗿

[@its.d3o]

تجربة شقي يونك😔❤️‍🩹

[@zuri-rj6lq]

ها شكد طلعتي معدل

[@its.d3o]

@@zuri-rj6lq صرتت تحليلات😔😂😂😂

[@zahrasatar8402]

تجربة شقي يونك جيش علي فلاح❤😂

[@jondo7680]

Now imagine a particle riding this wave. Voila we got the pilot wave theory and the absurd ideas about the universe splitting constantly and zombie cats are gone :-)

[@NilsBerglund]

But it is! Haven't you read "The Rise and Fall of D.O.D.O" by Nicole Galland and Neal Stephenson?

[@jondo7680]

@@NilsBerglund no, but I think I would like it :-)

[@NilsBerglund]

What are you waiting for? Find the book and read it... :D

[@jondo7680]

@@NilsBerglund I'm waiting for the invention of the time machine, so that I can use my time more efficiently. The best solution would be by sending my mind to my past self.