MIT 8.04 Quantum Physics I, Spring 2016 View the complete course: ocw.mit.edu/8-04S16 Instructor: Barton Zwiebach License: Creative Commons BY-NC-SA More information at ocw.mit.edu/terms More courses at ocw.mit.edu
Пікірлер: 698
@luisangelespinozahumberth101610 ай бұрын
Que nivel de clase de este profesor . Orgullo peruano .
@elitedelobos9 ай бұрын
No es peruano es Judío Ultramar. Judío ...
@juanrodrigovalencia9 ай бұрын
@@elitedelobos Puede ser de origen judío, pero nació en Lima, creció y estudió en Lima, graduándose de la Universidad Nacional de Ingeniería. Es recontraperuano
@elitedelobos9 ай бұрын
@@juanrodrigovalencia No. El siempre la tuvo clara. Es un judío y tiene nacionalidad judía.
@juanrodrigovalencia9 ай бұрын
@@elitedelobos En serio? Y tiene pasaporte "judío"? Por favor JAJAJAJJAJA
@ginnopuma9 ай бұрын
@@elitedelobosmira mongol si Vienes a opinar sin info mejor ni opines lapiz😅
@BiscuitZombies3 жыл бұрын
This is brilliant. This professor explains things extremely clearly.
@BeckBeckGo3 жыл бұрын
Agreed totally. His pacing also is fantastic
@prototype81373 жыл бұрын
Lol.
@RobH.3 жыл бұрын
He is a pseudo scientist!
@tanishqbagria54593 жыл бұрын
I'm 12 and I got it too
@08C6PaceCar3 жыл бұрын
Does he tho ?
@marcocarrasco60378 ай бұрын
Barton, el único estudiante en la historia de la UNI que se graduó antes de terminar su carrera.
@mayimbu66629 ай бұрын
El mejor alumno de la historia de la UNI.
@ARCP-mj1mr9 ай бұрын
Es de mi facultad
@paultarazona79899 ай бұрын
@@ARCP-mj1mrq nunca lo ejerció
@joser.98278 ай бұрын
@@paultarazona7989XD
@omargclb8 ай бұрын
@@paultarazona7989😂😂
@cesarrolandorumichehernand26437 ай бұрын
Buena la profesión le sirvió para hacer investigación, dónde invierten otros países extranjeros.
@moinmalik1320 Жыл бұрын
Besides the wonderful clarity in his lecture, I am amazed at his very clear, beautiful, and organized writing on the board.
@Thighwatts11 ай бұрын
A good university isn't just made by the sum of their students' success but by the ability of their professors to teach and simplistically explain complexity!
@petrok1rp2544 жыл бұрын
Such amazing job Mr. Zwiebach! Thank you...
@pmo19725 жыл бұрын
"That's what polarizers do for a living" :)
@flossenking4 жыл бұрын
lol
@xtra-oi9xb4 жыл бұрын
.... what percentage of polarizers are unemployed .. that's what I wanna' know ... it seems the good professor overlooked this dilemma during the lecture ..... hmmm .....
@MikeSmith-cl4ix4 жыл бұрын
The polarizer proves that light is a wave and not a particle.
@MikeSmith-cl4ix4 жыл бұрын
@Phoenix do you think Trump is a real president?
@MikeSmith-cl4ix4 жыл бұрын
@Phoenix when the Suits come for you, don't answer the door.
@gregsg23513 жыл бұрын
This lecture has nothing to do with me but I became entranced with his style and voice! And I actually learned something new in quantum theories. Thank you Sir.
@manaoharsam42113 жыл бұрын
Great Teacher. Takes time and explains well. Defined indeterminism very clearly.
@pity47773 жыл бұрын
Well spoken with excellent handwriting. A rarity among physics professors
@BSP201014 жыл бұрын
"It's a debacle! A total disaster!"
@milind-96834 жыл бұрын
thank you MIT, thank you sir, and thanks to whole staff there.
@ramonasosna6 ай бұрын
I definitely agree when you mentioned that it's good to learn from physicists and it's useful that we have them, it is good to make new explanations for what comes next.
@mohammadasefhossaini79853 жыл бұрын
Thank you MIT and sir. Wish him long life and happiness.
@RC-uo3ds3 жыл бұрын
Brilliant lecture given by Barton Zweibach Sir .....
@vector83104 жыл бұрын
This exposition is as clear as can be
@SatishSingh-mk7jq2 жыл бұрын
Thank You for making it understandable !! I am a software engineer in network domain. I just watched these videos(first 4) out of curiosity, and I was able to understand a rough picture of what's trying to be conveyed. Last time I studied physics was in pre-college days.
@andressuarez61532 ай бұрын
peruvian's proud!
@richardmakiya71882 ай бұрын
@@andressuarez6153 así es.
@victorcortez4799 ай бұрын
Si estuviera traducido al español, seria genial. Excelente Profesor. La UNI siempre destacando.
@luchomarrano9 ай бұрын
Lo cierto que la UNI no hizo nada por él, pudo haber estudiado en cualquier otra universidad e igual hubiera sobresalido, más bien la UNI debería estar agradecido de haber acogido a una mente tan brillante
@s0ulseeker.9 ай бұрын
Aprende inglés en vez de perdir subtitulos, por eso los egresados de la uni muchas veces terminan enseñando de profes en academias 🤣🤣🤣
@AlexanderBlow9 ай бұрын
Ese Barton solo copiaba en la uni yo lo conozco le ponían 20 los profes solo porque su viejita era bien bandida la prra😅
@Diego.Andree9 ай бұрын
@@s0ulseeker.? Por no aprender inglés?, mano como en toda u siempre hay gente que no ejerce su carrera.
@Diego.Andree9 ай бұрын
@@luchomarranoconcuerdo
@ralphdams75684 жыл бұрын
What a wonderful teacher you are, if I may say so. Thank you for sharing this lecture with the public. 🤓
@StarNumbers4 жыл бұрын
A shill can only repeat the obvious -- it's in the public.
@ralphdams75684 жыл бұрын
🙂
@eastwestcoastkid4 жыл бұрын
Bertrand de Born really?
@eastwestcoastkid4 жыл бұрын
Bertrand de Born I’m sorry MIT is one of the preeminent science and engineering schools on the planet. So this professor has earned his position in that esteemed University. Have a nice day. Also no one ridiculed anyone-I think you’re projecting-and I’ve learned quite a bit thank you much 😃😉
@eastwestcoastkid4 жыл бұрын
Bertrand de Born oh please-try this-why don’t you go to Feynman’s lectures in Physics and start reading at volume 3. You learned this in 9th grade huh? I doubt it. This is Quantum Physics-you did not learn this in 9th grade. Go to OCW, and look at the ENTIRE CLASS genius. Tell me, why do you have to use the renormalization group in Quantum Electrodynamics? How do you know you understand English? Fella, you lost all credibility when you questioned the status of MIT. All credibility. Have a nice day, remember not to go out as you don’t want to be exposed to SARS-Cov-2 and get COVID-19. There’s a good fellow. G’night 😉😃👍. Oh and we are done.
@user-ie2ur4ry5t9 ай бұрын
Good and clear teacher. Good tempo and very to the point.. Absolutely well done and definitely keep it up!!! .
@lesubtil76534 жыл бұрын
I can tell he is a good teacher because I understood this little "lecture" better as when my teacher taught me the same subject, even if my teacher spoke my first language (french), and this teacher speak english, that is harder to understand for me.
@rajinfootonchuriquen Жыл бұрын
In some sense, the fact that he is peruvian and has as first lenguage the spanish, it make him use simpler words to do his lectures so it's easy to follow him in his thoughts.
@user-tt2po5wg7n4 ай бұрын
Well spoken with excellent handwriting. A rarity among physics professors. Maravilha de aula! Eu diria um pacote de fótons de aula! Parabéns!!.
@juanjoseph71809 ай бұрын
De los mejores profesores de física.
@Unambiguously1823 жыл бұрын
I really like his handwriting This looks so passionate
@Tensoren-yj9ux3 жыл бұрын
In that case I advise you to check out Nima Arkani-Hamed.
@justinkane29014 күн бұрын
Wow, clearly explained and at a pace I can work with. Gonna be watching more of these.
@evcman43834 жыл бұрын
Man, I just enjoy listening to his voice....
@oussamaaljarroudi97243 жыл бұрын
Me tooo I swear to God 😄😄😄😄
@fjs1111 Жыл бұрын
This professor is one of the best
@georgestuart8656 Жыл бұрын
What a lovely man. So calm and precise. I remember being introduced to Imaginary numbers at school. POW. Mind blown. Two years later in college, they're vectors. Oh. Why didn't they say that ? On a par with year 2 maths class. Ok. Let's consider n. n is any number ! Pow. n is clearly a letter. Dropped out of the top maths class soon after. Got back in again though. Just the whole year missed and forever holding on by my finger nails since.
@italoperezcifuentes60689 ай бұрын
This professor was a former student of one of the best universities in Latin America, the prestigious National University of Engineering (Peru). He was not your average student or teacher. He is a living legend, a GENIUS. Feel privileged to receive their knowledge in your country. Saludos 🇵🇪
@renzosanchez47329 ай бұрын
No me di cuenta de que era barton, such a precious gem of our country. It's a delight hearing his class
@katyvaldez88909 ай бұрын
Si bien la UNI es una de las más díficiles de ingresar en el Perú, no es una de las mejores universidades de Latinoamérica, de hecho, en rankings de universidades, no llega al Top 60 de Latinoamérica. No es por desmerecer nada, pero las cosas como son. Y sí, el profesor es un genio.
@fernandoalejo9 ай бұрын
JJAJAJAJJ prestigiosa por donde wbonazo
@Diego.Andree9 ай бұрын
No exageres man, no es de la mejores de Latinoamérica pero si tiene su prestigio
@mla772918 күн бұрын
Solo no es de las mejor de LATAM porque no sabe investigar seriamente con metodología real. Pero que cubran este hueco y verás como brillará frente al mundo 😎
@sell_or_stfu84054 жыл бұрын
Wow. The universe it truly random. Thank you.
@PauloOliveira-pq3qr3 жыл бұрын
Maravilha de aula! Eu diria um pacote de fótons de aula! Parabéns!!
@barryzeeberg3672 Жыл бұрын
just now found this by chance - he is excellent. if they make a movie about him, he would be played by Dustin Hoffman.
@ScientificReview2 күн бұрын
The funniest lie ever; if they cannot determine it, then the determinism is lost. The amount of grandiosity of the title of this video is ultimate; despite it appears to be super humble.
@eoinlanier55082 күн бұрын
Our ability to determine is irrelevant if there are no local hidden variables. Bell's experiments prove that particles literally do not inherently contain the values needed to predict their behavior.
@ryanrizzo38666 жыл бұрын
Thanks for the lectures!
@jamesfkey6 күн бұрын
Wow, this takes me back to undergrad QM. Sets good foundation for QED. Well done professor!
@suyrai4u3 жыл бұрын
Now I understand What entanglement actually means ! Extraordinary explaination
@jeanlacombe3606Ай бұрын
Merveilleux cours de physique ! Merci de partager toutes ces explications si claires 👍
@keepgoing3353 жыл бұрын
there's something about writing on a chalkboard that just makes it much better than presentation slides as a teaching medium for showing equations
@Carlos_Sernaque8 ай бұрын
La leyenda de la UNI-PERU , Barton Zwiebach👏🏻👏🏻👏🏻
@jamshidfaiz670527 күн бұрын
Absolutely brilliant. Thank you for sharing.
@sgsmozart3 жыл бұрын
Wow !...A professor who writes cursively ! 🎊🎉🎊
@BlochSphere3 жыл бұрын
So with respect to Linearity discussed in previous lectures, Beam of photon should be described as Beam |photon_alpha> = a * cos_alpha * |photonX> + a * sin_alpha |photonY> Where a is some constant
@pellythirteen56546 жыл бұрын
Good and clear teacher. Good tempo and very to the point.
@smalin4 жыл бұрын
What are all the physical processes (besides the behavior of polarized photons) that are non-deterministic? Is radioactive decay non-deterministic? Is there a complete list of non-deterministic processes somewhere? Are all non-deterministic processes somehow the same process at their core?
@eastwestcoastkid4 жыл бұрын
smalin yes as quantum mechanics describes radioactive decay-yes. Same process at their core? Only in the sense that they are part of the class of non-deterministic things. Ah the point behind quantum mechanics and quantum theory is that what we think as determined is at base, not deterministic.
@trafalgarla4 жыл бұрын
It's not an easy question to answer because what is deterministic (or whether anything is deterministic) depends on which interpretation of quantum mechanics is correct and we don't know which one is correct. For example, everything is deterministic in the Many Worlds interpretation, including radioactive decay, since the wave function describes all possible events. Questions about determinism are usually left to philosophers of physics nowadays so the Stanford encyclopedia of philosophy is a good starting point to read up on some of it. plato.stanford.edu/entries/determinism-causal/
@francoisdeletaille3 жыл бұрын
@@eastwestcoastkid In my view It is the instant (now) that determins reality, on the base of what is determined previously. So that the instant is not completely severaged. By this, I do not means that the instant acts upon reality, but that it is the concrete manifestation of everything that takes place in the instant. Continously. But "free".
@eastwestcoastkid3 жыл бұрын
francoisdeletaille that is an interesting philosophy-but at base Quantum mechanics and Quantum theory hold that physical reality is not deterministic-hence the uncertainty principle.
@francoisdeletaille3 жыл бұрын
@@eastwestcoastkid I think we agree. At some point, reality is determined (observed). But it remains open.
@apolloniuspergus92953 жыл бұрын
Well, the bell inequality just shows that you cannot have both a local and hidden variable theory combined. If you have a hidden variable theory, it has to be non-local, and if it's local, it has to not rely in hidden variables
@Krish_202 Жыл бұрын
Yeah pretty good argument 🤷♂️
@hansenchrisw Жыл бұрын
Thank you. Was about to make a similar comment. Bell himself was a proponent of Pilot Wave theory aka Bohmian mechanics. A completely deterministic, nonlocal, hidden variable theory.
@brainstormingsharing13093 жыл бұрын
Absolutely well done and definitely keep it up!!! 👍👍👍👍👍
@cesitarc.44909 ай бұрын
Barton Zwiebach the genius from Perú.
@JetpackBattle-lc7ob2 ай бұрын
I appreciate the fact he is saying what actually happens with the correct terms, instead of abstracting it all away. I watched a similar MIT lecture but the professor was using terms like "color and hardness" to avoid "confusing us" but for me it made it really hard to picture anything in my head and follow along cause electrons don't have "color" or "hardness" in the classical sense
@lepidoptera93372 ай бұрын
That's an exercise to get students to understand that nature does not consist of phenomena that can be described by commutative algebras alone. It's the big insight of Heisenberg... except that he had to figure it out without help.
@user-ul7xl7jq3w3 жыл бұрын
There is a difference in the way of thinking of the inequality sign (or information bra-ket) when we see light as Einstein inertial system and when we see light as quantum entanglement information. Is a very effective inertial vector. In quantum information entanglement, since it is not an inertial system, it is considered as |photon:〈xψy〉:photon|, and it is an information system that should be distinguished from the inertial system, but (photon:ψ>)=(photon: :ψ〉), the optical inertial system and the optical information system are equivalent. This is an important lecture from the perspective of consideration.
@zack_1205 ай бұрын
11:00- Really true, consistent with the wisdom there are more unknown unknowns than known unknowns. 15:25- This statement makes the superposition concept a bit easier to comprehend.
@schmetterling44772 ай бұрын
Nothing he says explains to you where superposition really comes from. If I were to test you orally on that question, I could easily fail you, right now.
@alexandervassilev67029 ай бұрын
Excellent professor
@user-zk1dg4tu6l9 ай бұрын
Does anyone know what experiments he is referring to when he mentions people have ruled out the argument "It is the unknown subatomic structure of the polarizer that determines which photos pass vs are absorbed?"
@smartscience53053 жыл бұрын
Hello Dr. I am 12 years and this video was great , and I wish to be more specification and harder. Thank you
@tayfun111006 жыл бұрын
Thank you Barton Zwiebach and MIT.
@dariopalomba84203 жыл бұрын
Prof. Zwiebach is actually very good, but for any "not perfect English speakers", it was absolutely necessary the presence of subtitles....in English! Anyway, thank you for the lesson and greetings from Athens, Greece.
@sucersdungeon3 жыл бұрын
A great speaker. An inspiring video.
@csjfd17645 ай бұрын
excellent explanation ! Congrats, professor !
@wulphstein4 жыл бұрын
Glad you figured out that determinism is voluntary.
@Adityarm.083 жыл бұрын
These lectures are awesome!
@beggar14153 жыл бұрын
116 dislikes show jealousy of not having best teachers like him
@SanjayPandit-sc9xx15 күн бұрын
Thanks sir for this beautiful lecture from India.
@idea2go12 күн бұрын
Great lecturer, thanks for posting this
@mikefredd33903 жыл бұрын
Now I know what good teaching is. This is a strange world where we know so much but are somehow missing the point completely.
@worldnewsfoodandbooks82184 жыл бұрын
Looks like Harisson Ford
@stevematson48084 жыл бұрын
After the lecture he's going off to fight Nazis and discover stuff
@stevematson48084 жыл бұрын
Thats Harrison ford doing an accent
@carlosalbertocuadros54694 күн бұрын
Good Job Professor
@SanjayPandit-sc9xx15 күн бұрын
Totally concept clear from this lecture.
@jairofonseca15974 жыл бұрын
This must be the best lecture on loss of determinism on the net, much thanks.
@StarNumbers4 жыл бұрын
You lost determinism when you flip a coin. Write parents to send more money.
@nassimabed4 жыл бұрын
I've seen better
@aravartomian14 жыл бұрын
No
@brivda4 жыл бұрын
@@nassimabed care to share the better video?
@nassimabed4 жыл бұрын
@@brivda I had written that comment a month ago. I have no recollection what this video was about or what other video I was thinking about. Not to mention KZbin won't allow video comments.
@marktwain6223 жыл бұрын
It's nice to see MIT still using chalk boards, very OG.
@yoshirovilchez339210 ай бұрын
Grande Zwiebach, recuerdo que nos metiamos unos dotitas en el lab despues de los finales
@josiaszapata69849 ай бұрын
XD
@Diego.Andree9 ай бұрын
XD
@kskrishnasangeeth4 жыл бұрын
Great explanation
@sandeepanand323111 ай бұрын
Excellent lecture!
@js-fx6vm Жыл бұрын
The figure in this explanation would be better if shown in three dimensions. The professor’s explanation describes a plane wave oscillating in a plane parallel to the z-axis at an angle alpha to x--z plane. Then the closer the plane of the wave gets to the x-z plane, the greater the transmission of the wave through the polarizer.
@BenTrem426 күн бұрын
_Reminded me of _*_how entertaining physics really is!_*
@betanapallisandeepra11 ай бұрын
He is very good teacher…
@amj2024511 ай бұрын
Even Bell himself didn’t think that he proved the impossibility of hidden variables. Travis Norsen: in his book (titled ‘Foundations of Quantum Mechanics’) says: “There is a kind of rich and tragic irony here, in citing Bell as having supposedly refuted hidden variables theories …, Bell’s theorem was actually inspired by Bohm’s 1952 pilot-wave theory papers, and indeed Bell remained far and away the pilot-wave theory’s greatest champion until his death in 1990.”
@ericpham40113 жыл бұрын
quanta was energy unit measurement. if we can program photon in twisted wave guide. is there two type of frequencies minum to have light so should it be Frequency**2 ) * wavelength= speed
@neoaureus4 жыл бұрын
So energising a lecture ! Wow
@rsalazar97844 ай бұрын
Porfesor Barton, alumno de la UNI - PERU.
@debbiemccoig76722 жыл бұрын
Love this I enjoy it even though I not ready for this
@zhyfn9773 Жыл бұрын
are coefficients cos (\alpha) and sin (\alpha) sort of fitting parameter then? or do they have a theoretical origin given alpha is the state prescribed to this classical state of polarization?
@smcconnell2200 Жыл бұрын
Nicely done.
@tomnoyb83013 жыл бұрын
Polarizers are not filters, they are re-radiators. Imagine two antennas connected by a coaxial cable. The interfaces between glass and air are the antennas and the glass is the coax. Light impinges the front face, just as an antenna. If the antenna's polarization matches, the light enters the glass, propagates and exits according to the polarization of the back face (antenna) of the glass. Using this correct model of a polarizer explains polarization completely and without mystery. Bell's Theorem is not required, only Maxwell's equations.
@johnpepin53733 жыл бұрын
So... does that mean photons are constantly changing states, (polarization but not frequency?), before they are measured, because they exist as a wave function? Is that why when sent through one at a time all go through or none do? Moreover, why is it that when polarized light is sent through three polarizers, at right angles to each other... some light gets through? Is it because since it is not measured, some photons in the wave state change polarization between polarizers? Then why do three allow passage but two block all light? Plus why is it a wave function rather than a matrix of possibilities?
@charlesbromberick42473 жыл бұрын
Very nice presentation of a very confusing reality.
@michaelcheung62903 жыл бұрын
He is brilliant
@CarlosLeon-ii2fs11 ай бұрын
Increíble un ilustre Peruano haciendo patria en el extranjero.
@volcano86810 күн бұрын
the clue is in the title guys - Open Course. For anyone who wants to watch. And you've got to be pretty good at your subject to explain quantum physics so that anyone can even approach understanding that!
@surendrakverma5552 жыл бұрын
Very good lecture Sir. Thanks 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏
@r__9_1____a344 жыл бұрын
He said that hidden variables are not possible, but bells theorem says local hidden variables. Nonlocal ones can exist
@eoinlanier55082 күн бұрын
Nonlocal hidden variables would not be deterministic, though. If information can travel at infinite speed, then events are determined instantaneously, not by past states.
@caryknoop3155 күн бұрын
"If one gets through then all should get through" - No, and that does not imply there is loss of determinism. Just because we don't know (or understand something) does not imply it must be random!!!! They are identical, yes but the background is always in flux!!!!
@marcuspradas1037 Жыл бұрын
Brilliant indeed!!
@komolkovathana8568 Жыл бұрын
From Rene (Decartes)'s Materialism to Russell (Bertrand)'s Mechanicalism..our view on the Materialistic world was profound and set forth every Rational Aspect of our understanding. So we call the elementary ingredients study, the PARTICLEs Physics, due to Democritus 's undividable Atoms (though later we found many "p" are much smaller than 'P'). Light is particle called Photon, electric is classified as lepton, 900 times smaller than Proton (Neutron). Even binding Energy we considered them as Gluons-exchanged ? And same as gravity, forcefully we try to MAKE such Interaction as GRAVITON exchange process, another kind of tiny(minute) PARTICLE as well. All were found by materialistic view of the universe, Interacted together with some deterministic MECHANISM, either exact or by STATISTICS (that You consider it UNdeterministic.)
@David-gu8hv4 жыл бұрын
Doesn't Bell's inequality say that no LOCAL hidden variables can satisfy quantum physics meaning that NON-LOCAL hidden variables could satisfy it?
@J.V_Momo4 күн бұрын
I was about to sleep, but here I am taking notes.. Algorithm.
@AndreaCalaon733 жыл бұрын
Bell just showed that a HVT is non local and, if the formalism of spin is correct, that it is also contextual. Look at the interpretation of spin in the works of David Hestenes and other physicists, and contextuality desappares
@MichaelJones-ek3vx6 күн бұрын
I'm searching for memories of a long finished trig class.
@Obladgolated Жыл бұрын
What if _i_ - the imaginary component of the wavefunction - is the "hidden variable" that Einstein theorized might be present for photons? I mean, it isn't unreasonable to expect the _i_ component to have _some_ physical manifestation, is it?
@ashishkoduri15 күн бұрын
I took some acid and I’m watching this feels like I can make a photon accelerator after watching this, shout out to g for dropping this lecture
@theea3466 Жыл бұрын
2.40?? V velocity x wavelegth = C speed of light. F frequenxy x wavelength = v velocity.