The Language of Quantum Physics is Strange | PHYSICS EXPLAINED

[@hemangmathur2823]

That illustration of schrodigers cat at 3:00 is the best thing I've seen all day.

[@crinanthethane9386]

Please don’t change anything regarding your content and style. Your explanations, for a truly complex topic, are easily digested for this simpleton. Much love & respect! 😁🙏🏼

[@kassios]

Wow, I actually understood everything! Looks like my Linear Algebra university lessons weren't useless after all. (Matrixes are everywhere)... You sir are an excellent teacher.

[@clint330]

@@ParthGChannel yes I agree with Diver, you're quite good at teaching!

[@tanbir1631]

It helps me a lot,things which I studying made more clear.... One more thing if you shear your story how you get admission in UK,it will be helps Indian to get their, for a better opportunity for knowledge

[@jaybhambure5969]

I am not trying to be pedantic here, but Matrices are a "Representation" of a quantum state or operators. Furthermore, matrices can ONLY be used if we are dealing with a finite number of states e.g. the spin of the electron. If we have a system with Infinite states e.g. hydrogen atom or scattering of particle or even operators like the position operator, we cannot use the matrix representation, in such cases what we need is an abstract representation, which is the Bra-Ket notation. To push this to an extreme limit, no one really knows the dimensionality of the Hilbert space. We ASSUME it to be infinite (postulate of QM)

[@amritkumarpatel5717]

@@ParthGChannel please make a discord server wher we can discuss about physics

[@vanguardcycle]

Completely agree. So glad I found this channel

[@clint330]

seriously loved this! i now get the wave equation notation like never before!! I'm an electrical engineer by degree and I work for NASA JPL and I've studied quantum mechanics a bit for particle accelerator and plasma physics work that I do but the math for QM hadn't quite clicked for me until you just explained it in the 2d space similar to the unit circle for complex math! GREAT video! and i hadn't known about the ket and bra and bra-ket lol thanks! i really like all of your videos! please keep it up!

[@makara2775]

៣៣៣៣១៣

[@makara2775]

សហ៣្៣ឲ៣ ៣៣៣៣រក៣៣៣៣៣លើលោក ៣ ៣ កករក ៣យកស៣ហើ៣ថត៣៣ងងុយកកកុញមក៣

[@perpetual_bias]

This has been _extremely_ eye-opening. Thank you

[@HaiderKhan-nc9gf]

My dear Parth you are a blessing. Because you explain every little thing from the very basics. Not many are doing that with such clarity and eloquence as you do. Thanks

[@stevemetcalf2482]

Just the kind of level I am looking for. I'm a retired 69 year old just discovering quantum theory and love everyone of your videos. The comments section is also very entertaining, and at times controversial. But what would physics be without some challenges? Keep up the good work sir, you are an inspiration.

[@arunjanarthanan6380]

Within the fist 2 seconds of the video beginning, I start smiling, and feel as if you have already conveyed the key point! transfer of knowledge at its beautiful best!

[@ianbolton9601]

Excellent... I studied this 30 years ago as an undergrad and it brings it all back. Very clear and I agreed with the another persons comment that more of this stuff needs to be explained and taught to 16 to 18 year olds; this video helps make it accessible.

[@Lostmemarbles]

Wow, I've never made a KZbin comment. I'm a fan after one video! Thank you for making understandable videos on a complex subject. Great work! Now I'll never get any sleep.....

[@cybrainx72]

You are one of those no-nonsense youtuber :) Thanks for making this.

[@xfoxawy]

u just explain it as simple as possible which is amazing keep it up my man

[@bineshpv8784]

I am 38 now .... I still want to learn QM in depth. I realise that you could help me in suggesting the correct references in addition to watching your videos... you explain everything very nicely..excellent job...keep it up.

[@not_your_fault-7]

Man!! Hats 🎩 off to you 🙌🏻🙌🏻

[@tomdeclue6424]

Parth, I know you made this some time ago sir, but you are excellent at explaining difficult subjects to curious novices! Thank you so much for taking the time to do so!

[@PurnamadaPurnamidam]

Thanks Parth, u r sooooooo kind.

[@themartian9634]

Thanks Parth For all your Awesome and Knowledgeable Videos ! U really Explain in a Very Smooth way !

[@littlemermaid3058]

Hey Parth! I can’t thank you enough for this... For once quantum physics started making sense to me .. I used to love physics until it all seemed getting so abstract and complicated , I lost it completely .. I have been a housewife for past 6 years and you make me think of getting back to studying physics. I watch your physics videos in my free time.. I have a request for you.. Is it possible to make a video on evolution of physics ? How different fields of physics came into being?

[@jonwoods6745]

Thank you very, very much for what you're doing! This has been really helpful, and I hope you feel like your efforts are recognized and appreciated!

[@overlordprincekhan]

The moment he said "Bra", my mom was looking at me with her eyes wide. I thought this was my end 🤣

[@mushtaqhussain8500]

Sir you are far better than most of our nonsense proffesors who themselves dont know what are they teaching. Thank you for all of these conceptuall stuff you are delivering ❤

[@olversevilla5139]

Great video, honestly the spirituality thing and Quantum mechanics are so realted, that's why 2 things can exist at the same time and at the same place.

[@paulnelson112]

Damn im studying applied mathematics and this video was truely brilliant , the way you described shrodinger equation was awsome keep up the good work Wish u luck

[@jaybhambure5969]

@4:29 Hey Parth your videos are great, and I really enjoy watching them. Just a small thing -- I psi > is not a wavefunction. Its a ket. Once you take an inner product of I psi > with either position < x I or momentum < p I basis it becomes a wavefunction. Further you cannot do these inner products with spin because it's an internal degree of freedom and has nothing to do with space or momentum, hence we only have the abstract notation of Kets no wavefunctions for spins.

[@brendanfan3245]

This is the best channel that can explain the foundamental ideas of physics so well. Highly recommended.

[@RyanK-100]

Wow. This guy explains the basics in a way that NO ONE ELSE does. I used bra-ket notation for a year in grad school without knowing, really, what the hell I was doing. I just did it by following patterns which allowed me to pass tests. No book, professor, or classmate could explain it - they just used the very concepts in question in their explanations. This Parth guy boils it down to the fundamentals - a natural teacher and almost a mind reader.

[@accgurulegal4388]

Ohh Man, I am a financial analyst by profession but a seeker in quantum physics, I am privileged to able to understand quantum physics in best possible way... Gratitude with full of love to you.

[@schmetterling4477]

Except that you didn't understand a thing here. ;-)

[@accgurulegal4388]

@@schmetterling4477 knowlegde is available to every seeker. But this fact is difficult to understand for a self possessed idiot, who seeks the opportunity to underestimate others potential, without even knowing them.

[@schmetterling4477]

@@accgurulegal4388 I don't have to know you. I have a PhD in physics, kid. I know that you can't possibly understand this stuff without spending years in university. :-)

[@accgurulegal4388]

@@schmetterling4477 i dont need a phd to persue my intrest, nor i am comparing myself to anyone, and definitely not underestimating anyone's capabilities. You can be the greatest in your field of knowledge, but it seems igo is the driving force here.

[@accgurulegal4388]

@@schmetterling4477 University teaches the stuff already known, but this human machanism itself can be the greatest source of knowledge. This wisdom does not differentiate based on colour or creed, a humble person who can look beyond the igo & desires can achieve better understanding of quantum them to a university taught phd guy.

[@CrownedMeadow]

You have such a uniquely-natural and logical way of explaining these very supernatural, illogical phenomena. Keep it up. 👍

[@adinathkolhapure6697]

"How to do higher studies in quantum physics and what is scope" please make a video about this 🙏

[@bobross5716]

You have to do a PhD in physics and then decide to do some kind of research involving quantum mechanics

[@ParthGChannel]

Essentially what Bob Ross said haha!

[@jaybhambure5969]

@5:16 Probability is not equal to (number)^square, it's the modulus square -- |number|^square. This is very crucial since we can have complex amplitudes.

[@Jehannum2000]

He's just simplifying for a general audience. You could say the probability is equal to the inner product of the amplitude and its complex conjugate. In fact, there are good reasons for doing so - but it wouldn't mean a lot to the general viewer.

[@d.tghenaabbas8424]

I think this is the best quantum mechanics video I've seen so far, keep up the good work :D

[@asthaghosh9108]

I love this series please continue it :)

[@anthonyskilton8634]

I'm about to retire and allow myself some time to return to the Quantum Physics that I didn't get years ago. This is exactly what I need and I can't wait, thank you. With yourself and Sal Khan what more could we need.

[@bodysorcery]

Super clear explanation of a complex subject. Please make lots more!

[@BlahajE]

I'm 16 and writing an essay about the Dirac equation, thanks so much, your videos save my life!

[@orlandmedina4046]

Thanks for adding a bit more to my understanding of this exciting field! Excellent work!!

[@matthewcapstick6242]

I love this content!!

[@prgnsean]

TERRIFIC video. Ive heard guys like Sean Carrol talking about "the dimensionality of Hilbert space, and for the wave function of the universe, is it infinite?" and never really got what that meant. Now i get it! Its a measure of all the possible states of a superposition. Very cool!

[@kalyani6466]

This is just awesome Parth! I was waiting ever since for this series to elaborately show up. I'm a freshman in physics and I'm already working in quantum computation this winter as a part of my internship. To be back from work and see this is really blissful and refreshing.

[@xouzaing7868]

Please do more of these. They are extremely helpful for someone as myself who hasn't studied physics at university level (yet). I would personally love to see some more/a continuation on Schrödinger's equation, but of course also just whatever you feel motivated to make.

[@talldarkhansome1]

Excellent! This is what is needed for us amateurs! Thank you....

[@robertschlesinger1342]

Excellent video. Very interesting and informative, and a must see for all beginning science students. We look forward to any sequel videos on this topic.

[@faraazali9589]

Great video. For such an abstract concept you made it tangible, especially with the illustrations. Keep it up!

[@curtpiazza1688]

Your explanations are so clear and concise!

[@chiranjeevmishra8419]

Teaching like yours are making all the difference🙌🙏🏻

[@nadeemhameedi1196]

So good ! Well explained with little hand waving arguments. Keep it up

[@jackedelist770]

This is such a great resource for me as a high school student. Please keep making these!

[@jishnun4537]

Been studying qm for long..yet missed this simple representation in abstract space..now everything makes more sense. Thanks a lot , u are an awesome teacher and i can sense feynman technique in ur vids.

[@swarajshekharnande3803]

I love you brother. A brother from India. Do this as much as you can please.

[@culturedgator]

Love your content

[@zhabony1]

Man, Thank you very much! I was not bad at maths at all, but spent weeks trying to understand how spins are described with vectors. Even in basic quantum computing intros either book or youtube videos they start with electron beams bent toward North and South magnet pole, spin can be up and down, and suddenly they show vectors up and right(!?) (what the hell?). North-south, up-right are (0,1)and(0,-1) why they use (1,0)(0,1) ?? Now it is much clearer ( at least to continue reading about :-) ). Thank you for your time putting together this video!

[@PrettyMuchPhysics]

Great summary of QM's core concepts! Wave function, superposition, collape, ... :D Small comment: at 01:50, 〈 ψ | ψ 〉 is only equal to 1 if the wave function is normalized!

[@melchiortod29]

You posted a video 3 days ago. 16000 views. Nice to see how far you've come

[@AshishKumar-fg1qj]

Your way to teach is great! you should start playlist and regular post related to same topic on particular day in a week. I hope u keep your dedication to teach us how physics works ✌️

[@ManmohanSingh-yi8tk]

Hi..Could you make videos on Tensor theory...

[@JamesTheron]

This is great, especially great because I'm not taking physics 2 at uni and I just watch these videos for fun. Some of your other videos really helped me out for my physics 1 course though.

[@pedrodaniluz]

This is just awesome! You are a brilliant teacher!

[@dagobertduck7522]

You have the gift to make things stick in my head. Pleeease keep on explaining quantum physics. I am enjoing your videos so much!

[@ravisekharreddy9783]

Good

[@semmering1]

Excellent - thanks for your work, I really enjoyed it!!

[@meetneetu438]

Amazing easy to understand, thanks for knowledge.

[@Dawn_Of_AI]

great explanation...loved it!!!

[@malayapaul458]

Why are your videos sooo good?? Great work..... You're the best Parth

[@xinlongcheng]

It's probably the best lesson for me to understand quatum superposition! Thank you!

[@MaruriPorzio]

You are just amazing, please keep showing these exceptional videos, I'm learning a lot from you.Thanks

[@thomasdamico3120]

Brilliant and cogent primer for this topic! Your explanatory style is very crisp and precise. Thank you! You definitely inspired me to learn more in regards to this subject. I'll be starting the Open University this Fall (BSc Physics). I foresee using your great content to buttress my formal studies. Thanks again from New York!

[@lawriealush-jaggs1473]

Interesting: Check. Informative: Check. Something else, forgotten what but: Check. Excellent videos Parth, thank you.

[@saragrierson2440]

I also love these video's and find them helpful ! Keep up the great work !

[@5am484]

i love your way of teaching, its great and easy to understand.

[@neilmccarthy1036]

Absolutely amazing explanations!!! Just fabulous!

[@PremSePhysics-]

Great , thank you parth , waiting for. Next one 😊

[@1Chonn3]

Absolutely fantastic material! Thank you!

[@eldestisland4520]

When you added that purple vector, something clicked in my head. I think I actually understand why it's called a wave now!

[@alansaunders1828]

Really superbly clear. You explain it like you have really thought how to get a person over each hurdle (indeed, a person like your younger self )

[@nikhilvijayan2661]

Good stuff as always! keep up the good work mate 👍🏻

[@richvanatte3947]

Brilliant. It’s enjoyable leaning from you!

[@josephkarpinski9586]

Great video! Really enjoying the series. Would love to see a series on Quantum Field Theory.

[@jaydasg6]

Would like to have a roadmap for watching your quantum mechanics videos so that the subject opens up gradually.

[@abhinandanangra]

A question came to my mind that, how do we define state an object... Like in the Schrodinger's cat experiment... It has two states alive or dead.... But why does it not have states like leg broken,10 percent defective,blind,zombie....and so on ... So indeed can an object always have infinite number of states? How do we know (perspective)..

[@ParthGChannel]

Great question! It's actually to do with the measurement itself. The way we make a measurement on a quantum system is to apply what is known as a measurement operator to the system, and the maths of quantum physics gives us what are known as "eigenstates" of the measurement operator. Essentially, every measurement has its own special states and the result of the measurement is one of these states. Using the cat example, the states "dead" and "alive" are eigenstates of the measurement "Is the cat dead?", whereas maybe "broken leg" and "not broken leg" will be eigenstates of the measurement "Did the cat break its leg?" Understanding further using the vectors picture I've described in this video, the quantum state before measurement is a vector in the abstract Hilbert space. The eigenstates of a measurement will be vectors orthogonal to each other as we've already seen, and upon measurement the state will snap to one of these vectors. However the directions in which these orthogonal vectors (these eigenstates) point is dependent on the measurement we make. In the video I've only vaguely said that we "measure spin" of our system. However in reality we measure spin in a particular direction in real space. If we instead measured the spin in a slightly different direction, then it is possible that one of the eigenstates is actually aligned with the original quantum state, and the other is orthogonal to it. Hope that helps a bit!

[@kalyani6466]

Hey! It's not two states, alive or dead. You're taking it wrong. It's the superposition of those two states with the coefficient of linear combination being their probability of occurrence upon measuring.

[@xjuhox]

We can consider an atomic system in such a way that it has only two states, *decayed* or *undecayed,* and it's clear that those states are "orthogonal", that is, totally independent from each other. Since the atom interact very weakly with its enviroment (the enviroment has very low information about the atom) it can be in a superposition of decayed and undecayed states. Now the Schrödinger's cat thought experiment asks if we can magnify that microscopic system to the macroscopic world. The answer is no since the cat is in the intense interaction with its enviroment (and with itself) and that destroys the superposition and forces the cat to be in a one definite state, *dead* or *alive.* The analogous situation occurs with the double-slit experiment when we try to investigate the electrons path trough the double-slit: the interaction/measurement destroys the superposition pattern.

[@higherdimensions1459]

@@xjuhox Considering a quantum mechanical system with 4 states hence needing a 4 dimensional vector space. I heard that already in spheres the shortest distance between two points is no longer a straight line. How do lines behave in 4D? Are they curved? And what's going on with the angles? In case anything changes in 4 D like with space time being bent as mass is present- how can we know that we can add the vectors like we used to in 2D and 3D?

[@xjuhox]

@@higherdimensions1459 What spheres are you talking about?

[@kahdargo7]

Yes! Yes! More of this! I'm finally understanding the math (I mean, also after reading Susskind's The Absolute Minimum) but YES! More! I'm finally getting it! I never understood quantum physics this well in university.

[@douglasstrother6584]

"Quantum Mechanics: Foundations and Applications" by Arno Bohm This is a graduate-level text (or advanced undergrad text), so don't start here; however, the writing style is very clear and crisp. The author approaches Quantum Theory as an algebraic structure built to explain measured phenomena, like Werner Heisenberg. It treats states as vectors and observables as operators on those vectors.

[@schmetterling4477]

In other words... the author won't teach you any physics because he probably doesn't understand it himself.

[@mnada72]

I think the name "wave function" is misleading, all these years I thought that it's related to wave propagation or wave/particle duality. Now I understood that it's a description for the probability distribution of the function describing the property under consideration (am I right on this ⁉️) This video is great, thank you 😊 🙏

[@SM_Int.M.S]

Probability Distribution Function or PDF is a function itself... So it's better be Wave function rather unnecessary confusion arises.

[@mnada72]

@@SM_Int.M.S so at least we should say wave function of what !

[@markosullivan6444]

Really enjoy your videos, thanks! Keep them coming. Looking forward to the GR videos.

[@ALLAROUNDSP]

Please make a video on Hohenberg-Kohn theorems !

[@Michael-gh4xl]

A great video, Parth! Thank you, I understood a lot more after watching. Hi from Australia! Look forward to viewing more :-)

[@chrisd2492]

You are a great teacher, gifted

[@dwivedys]

Pretty helpful - especially where you get to the dreaded Hilbert spaces - thank you!

[@schmetterling4477]

For the purposes of physics a Hilbert space behaves exactly like a finite dimensional linear vector space and nobody is asking you to deal with the actual mathematical complications.

[@lilydog1000]

Many thanks for an excellent explanation. The math is relatively easy, but the concepts and how they apply in a measurement is much more difficult as I find.

[@schmetterling4477]

What's difficult about measurement? A measurement is simply an irreversible energy exchange.

[@xyz5192]

Sir please make videos on general relativity ...... actually I want to understand gravity from Albert Einstein perspective

[@xyz5192]

It's unbelievable .....that you replyed ......I really like your way to explain all these complex stuff ...

[@clint330]

@@ParthGChannel exactly!! :P

[@nirmalcd9410]

@@ParthGChannel pls do a general relativity series

[@ShailendraKumar-ug4tn]

@@ParthGChannel I m scared of doing my PhD in GR in future.

[@hrishikeshmavily5533]

Hey Parth I enjoyed the video but I wanted the proof of quantum superposition. How did scientists even know there is a principle like this? Pls make a video on this

[@StorytellerStudios]

I have been uncertain of the term "observe", the act which collapses the wave. Is the "observation" passive or a measurement requiring an interaction? Often I have seen it illustrated as an eyeball looking at the quantum particle which seems passive; however, the experiments on quantum entanglement seem to include filters and measuring tools which interact with the particle...or maybe I'm just confused? Love to hear a video on this...not a talk on the fact that I'm confused...I already know that! Regardless, I love your videos! Very we'll done!

[@shayanmoosavi9139]

The observation is always some kind of interaction, we can't do an observation without any intractions. That's why we can't detect dark matter and only predicted its existence.

[@Jehannum2000]

Observation / measurement becomes much clearer when you look at the Transactional Interpretation of quantum mechanics. It shows us that you always need an absorber response to 'collapse' the wave function. This is effectively ignored in the standard interpretation (even though it's in the maths as the complex conjugate) but including it removes the Schrodinger's Cat-type paradoxes.

[@pointysubset2276]

What books you follow for Quantum understanding? pls let us know..

[@mandanabidarvand6556]

That would be great if you could make videos about some of the quantum models such as Jaynes-Cumming! There are basically no videos on these topics! BTW Your videos are awesome! Thanks for the amazing work!

[@anonymous.youtuber]

You are really great at demystifying ! 👍

[@justoalejandrogonzalez5097]

First time here. 2 months ago was a 10k giveaway and now you are in 30k? that's impressive. Nice channel, I'll stick around. Like and subed.

[@nahidbonna6485]

Parth sir you are an absolute genius. Thanks a lot for the simple, easy and most importantly an easily understandable explanation. However, I have a question : when the wave function collapses to just one of the states from a superposition of both the states, how do we exactly know that it collapses to that particular state after we measure it. For example: if the quantum system is in superposition of an electron being in both spin up and spin down position and after measuring it it's wave function collapses to the electron being in spin down position then how do we exactly know that it collapses into the electron being in spin down position ? It could also collapse into the electron being in spin up position.

[@rageshnath]

Dude . You are amazing ! I have been learning QM for the last couple of months and I came to a situation where I have loads of doubts which are not quite reasonable to ask my professor. but I must say your videos are helping me alot . What are the important mathematical tools we should be thorough before learning QM ?? If you can put up a video on that ,it would be really helpful.

[@hartmut-a9dt]

many thanks for the very good explaining.

[@matthiascoronel24]

Love your videos man!!

[@IshaaqNewton]

This type of video about Quantum physics was really necessary for me.....

[@ParthGChannel]

Awesome!

[@RomanNumural9]

As far as I understand. ( And ) are called parentheses, [ and ] are brackets, { and } are braces, and < is called bra, > is called ket. So I think the notation is literally just saying "this series of characters: |A> contains a ket, so let's call it ket"

[@douglasstrother6584]

The are known as Dirac Notation.

[@addajjalsonofallah6217]

Alot if science is like that Let's call X X because X is X