Entanglement
ฝัง
- เผยแพร่เมื่อ 4 ก.ค. 2017
- 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
I am doing my Bachelor's degree in Computer Science but can't stop watching Physics' videos from MIT.
These videos are just too good !!!
These lectures will help you with quantum computing, if you take that at your university it will help to know some quantum mechanics.
I'm doing the exact opposite. Wish the current university system would't be so rigid in terms of courses you have to take.
change majors
I'm taking a Quantum Computing grad class right now, and this guy is everything. He makes this so much easier to understand. I wish I'd majored in physics :'(
So good lectures, I just cannot stop watching!
The explanation is so good, no complications, al grano.
This is a good simple way to explain entagled states
I was struggling grabbing the concept of it and this lecture helped a lot :)
Everyone forget alice and bob's contribution over 100 years for 2022 nobel prize🙂.
It's to bad the Nobel Prize is not awarded posthumously. John Bell certainly deserves one.
Love the initiative. World class Professor.
As a computer engineering student, entanglement kinda reminds me of flip flop circuits in computer science where the output of one NAND gate is used as the input of the other and vice versa
Check what spin conservation means. There are 5 of them.
This is way better than watching a movie, way more interesting.
Great sir ,, continue to inspire young physicist like us ,, thank you , kindly can ask for notes for " solid state physics "
Amazing sir Barton Zweibach ♥️♥️♥️
Beautiful lecture
Nice explanation of tensor product
7:18 “This state is un-fuck-torizable”
lol, I noticed that too.
Excellent lecture Sir. Thanks 🙏🙏🙏🙏🙏🙏🙏🙏😊🙏🙏🙏🙏🙏🙏
This lecture was fantastic
7:16
Amazing lecture bdw
I like this video. I recently heard of the zeno effect and now I'm wondering how that would work in an entangled state.
Could bob use the zeno effect to measure alice's environment without breaking the entanglement?
Good stuff..
2:15 this is the best lacture ever
He is so focused on the subject
That his animal instincts are in auto mode 😂
Will trynna figure out what jada did with august :
searched for that jada and will love，but i evetually started to watch this
Nice way to describe Entanglement.
6:10- Based on what is said (particle 1 and particle 2) the subscripts to the parentheses should be u and v, instead of 1 and 2 as written, respectively.
Pushes the boundaries of thinking, very nice. Though first mistake is I don't think particles "fly" around or that there is a limit to entanglement. More likely it's the bane of all theorists, everything is coupled.
you can't determine the system if you know the subsystem. if you can't determine the components if you know the system. the measure of either quanity increases the complexity such that the other quanity cannot be determined.
Bell only showed that the particles did not have a fixed state before the measurement but was incorrect in asserting that his inequality rules out locality or realism. It does not.
This is addictive.
I wish If all my teachers were like this prof
Mind blown
4m 4th circled squared.
Where do they explain mathematically and intuitively what this tensor product does? I guess mathematically i know its just matrix multiplication such that one produces a rank 1 matrix but why was that the definition chosen for whatever intuitive operation this tensor product is trying to do? Why tensor product?
tensor product operates in hilbert space, which has a real-valued norm. it also scales dimension. Given a 2-d, orthonormal basis:
x=[1,0]^T and y=[0,1]^T
where ^T is transpose of vectors
then the tensor product of x and y gives a vector z = [0,1,0,0] ^T which is 4-d. That's how groups of entangled qubits can hold exponentially more data.
Where does entanglement exist in physical world. How it is achieved?
Can nature superposition an entangled state AB, with an unentangled photon C to create a new superposition state ABC....in general can you superposition an arbitrary number of states? As in measuring photon C in up results in AB in up-down, and measuring photon C in down results in AB in down-up, respectively?
Justin P why not? Cant one do tensor products of 3 vectors if you want? It gives a order 3 tensor but mathematically it seems a well defined operation.
Justin P The polydynamics of the movement generates pseudo-autonomy as material property, of the autogenous phenomenon; existing.(...) as you said?
Justin P I use (//)
It's a honor to meet you living being...
Fluid theory (Reproduction/Feed/Reasoning) decanted selfover hexagon...
Jada????
7:19....'un what'???
Came to the comments to see if anyone else picked up on that, gave me a good laugh
Mathematically , it all fits , but does it physically make sense? Either everything is entangled or nothing.
What if u1, u2, v1, v2 has different chemistry state?
I don't think this would happen it's on a very low level like photon and that's why they are spinning and it doesn't matter what chemical state they have..
The effect is not instantaneous, but very fast.
Sir, what if they measure the spin of the particle simultaneously?
Theoretically it shouldn't depend of the timing(the math is such), but who knows. Also there are uncertainty relations in qm.
Is the tensor product is a linear operator? Because it seems that if you have two states u, v that satisfy the schrodinger equation operator L(u) = (ih d/dt u - H u), L(v) = (ih d/dt v - H v), then L(uv) = (ih d/dt uv - H uv) ≠ L(u)L(v)
But he mentioned that the tensor product is "kind of" mulitplying and not having cross terms, so I guess it's some operator that allows L(u % v) = L(u) % L(v), where % = tensor product, otherwise the entangled state her wrote wouldn't be a valid state?
How can download your videos with sub title
The captions are available on MIT OpenCourseWare at ocw.mit.edu/8-04S16 and in our collection on the Internet Archive at archive.org/details/MIT8.04S16/.
This John Bell destroyed Einstein Ha Ha
You know less about Quantum Mechanics.And read Bell's statements even after his theory. He
said There may be more on Entanglement which Einstein implied
@@soumyaadhikari9842 ever heard of sarcasm? 🤔
@@_DD_15 Okay I didn't get your sarcasm.Can you elaborate on what you are saying?
@@_DD_15 I don't think sarcasm means what you think it means bro
How to measure multidimensionaly?
When you take a measurement, you lift the curtain on something that was always there but just could not be determined until measurement lifts the curtain on either particle. They were destined to be in those states at the moment of entanglement--NOT at the moment of measurement. The indeterminate "all possibilities" state was just seeming that way due to the curtain of non-measurement obscuring the fact of inherent all-along state
that's a classical solution, it fails in practice
I get heart palpitations from this thinking about the exam I have bombed
Can entangled pairs affect on time
Yes.
7:19 "this state is unFUCKter..isable"
I don't know prof. if it was intentional but it made me laugh out loud.
THIS STATE IS UNFUCKED..tarizable
Laughed out loud as well. Right after that: "this is a funny state". Right. The state is funny. Great stuff :)
ooo oooo ooo yeah !!!!
If entanglement is real, then one should be able to use it for communication....But, a measurement on photon A only "collapses" the wavefunction at A and not B. That's the reason why it is not useful for communication and not the standard interpretation of the results being random.
11:04
@@vincenzoiannelli4029 that's just a restatement of what I said was wrong with the theory.
Simultaneity as unicity...
spooky action at a distance
Spooky action at a distance makes an assumption that the world as we perceive it is the same as it actually is. But the previous lectures show quite clearly that this is not the case. Consider the lecture that has a single photon going 'up' and 'down' at the same time, then interfering with itself. This can't happen if the world is as we describe it to be and ignore that it could be otherwise.
Does Jada Smith TA this class?
How did he determine that alpha1 times beta 2 is 0. These are magnitudes with direction shouldnt they multiply into a positive non zero? Or is he simply assuming that the sum has to add up to 2?
wave function of this lecture has collapsed at 7:29 minutes. lol
Can I understand |u1>, |u2>, Iv1>, |v2> is some specific form of | ψ> ? Anyone please😂
You can understand them as specific vectors of a vector space.
Total angular momentum of the universe should be zero, so once this particles are created, they should be always opposite to each other otherwise nonzero angular momentum of the universe appears,can this explain entanglement?
Angular momentum is only conserved if the background is both empty and flat. A sugar solution does, for instance, not conserve angular momentum. Neither does a magnetic field and you can bet your life on it that parallel transport in curved spacetime also changes it.
So if my "ship" is rotating clockwise and turns 180 degrees now I am counterclockwise when compared to my initial position, non conserved through rotation assuming s fixed frame of reference.
Sigo sin entender esta madre
Where is Jada Pinkett?
Is that how jesus managed to preach in many different places at the same time?...was it a type of quantum entanglement?....what an interesting lecture, the mans handwriting is an art and his style is part philosophical, is that a type of entanglement too?
we live in a simulated universe, if you can accept it - suddenly everything else in universe becomes explainable, from quantum weirdness to gravity, time and the speed of light limit, from unexplainable 100 decimal places number that sets this universe to be just right for formation of stars planets and life to unbelievable complexity of the human brain .. everything..
The mathematical description blew me away! What I don't understand though, is why there are only entangled pairs and not entangled triplets or quadruplets.
These exist
You can have as many entangled particles as you want. But determining if a particular state is entangled or not is very hard for more than 2 particles states (this is an open problem, to make an algorithm to determine this).
confused lecture
did not emphasize that the 2 entangled or connected half particles have a single wave function and hence equals a single whole particle
also doesn't know that communication is between different particles and never within the same particle
what does this mean?
There's no such thing as half particles, only subcomponents of a quantum system. The states he's describing for superpositioned or even entangled quantum states are wave functions that describe the whole system, composed of the superpositions of the pure state wave functions of the subcomponents.
Seems more like a case of confused listener.
What is the entanglement operator
Maybe seeing the earlier videos might help you. Here is the playlist: th-cam.com/video/jANZxzetPaQ/w-d-xo.htmlsi=vxYg8cX6ogfu7wWi. You can also find course materials on MIT OpenCourseWare at: ocw.mit.edu/8-04S16. Best wishes on your studies!
I bet Jada Pinkett Smith is interested in this lecture.
hahahah
She’s busy practicing superposition.
3 years later and this comment still has aged like fine wine
Underrated comment
Will Smith: “don’t f**king talk about my wife. SLAP!”
Please forgive me for being so petty, but I can't help but to imagine Gru giving this lecture. I'm so ashamed of myself. 🙈😂
Who cannot afford for university,here you can gather your knowledge ❤❤❤
What does |x> notation denote? Vector?
yes a ket is a Vector
It's only not transmitting information because you're uncreative. What if the measurement were the outcome of a bet? You get 10,000 galactic credits if it measures UP in the galactic casino. And at the galactic casino satellite, they have an entangled particle - if it measures DOWN, you get 10,000 galactic credits. Place your bets, as your location doesn't matter to win!
What is alpa nd beta
Coefficients whose squares summed equal one for u and the same for v. They are the sin and cos of the initial u and v vectors
U do need a strong com.tech.(ers)
Einstein Relativity s relevant for the three-dimensional space whom we know.
why does such an entangled state exist?
It can be constructed and measured. Basically some systems naturally evolve non entangled states in entangled ones, and we use that to construct these weird states
Because conservation laws exist.
Amazing lector idk wtf he said thou 😩😀😂
SMH @ using u and v and writing them so they look exactly the same
They don't look the same at all to me. Watch the right hand serif.
@@stephenanastasi748 That's actually helpful, thanks.
@@foobarbecue Your welcome. I just wish the rest of it were as easy. Good stuff, though.
7:17 I have a dirty mind
I like to host phycists in India...
I have a flat...we can work on some things....
Out of interest of course ..
Who knows.....the possibilities are endless
The very existence of the Pauli Exclusion Principle implies, insists, there is entanglement.
Yes, and the Pauli Exclusion principle is a direct consequence of relativity. More precisely, one can derive quantum mechanics entirely from relativity and Kolmogorov's axioms for ensembles of independent systems.
@@lepidoptera9337 You mean I'm right? I get butterflies every time I think of it!
@@jackbidnik9642 I meant that you made a lucky guess. ;-)
@@lepidoptera9337 Wonderful news about PEP and Kolmogorov's synthesis of relativity and QM. So there's no further need to search fo the TOE? By the way, I know somebody named Pat, that Kolmogorov could buy a vowel or two from.
@@jackbidnik9642 Awh, you are so cute when you are feeling sorry for yourself. We had the theory of everything since 1630, by the way. Can you guess what I am referring to? ;-)
It conflicts theory of relativity
actually it doesn't and here's why;
Here's a better explanation of quantum spin.
th-cam.com/video/YyZHmnmFjwE/w-d-xo.html
and a better explanation of entanglement
th-cam.com/video/7nSeP9RDr4Q/w-d-xo.html
Have a look please leave a comment let me know what you thought
One way to prove quantum entanglement is by assuming that matter creation is happend instantaneously.
So, every quantum states will behave like a synchronized clock to maintain total angular momentum zero
7:15 no... this state is unfuc-
@7:18 lol
"Entanglement", another label for eternal existence in the time duration timing modulation interval of zero-infinity, Eternity-now at the omnidirectional-dimensional Origin of Superspin-symmetry, Superposition-point Singularity, reciprocal-resonance imaging positioning, here-now-forever.
This lecture provides the format and terminology that identifies the principles Mathematically.
"Particle" => equivalent geometrical/frequency alignment infinitesimal in the Conformal Cyclical Cosmological Constant of continuous creation connection, the Principle of e-Pi-i reciprocal-resonance sync-sequence imaging.., => basis of Group Theory. (?)
Pictorial analysis of Turbulence such as has been done by "Smarter Every Day" helps form a combined Math-Physics Intuition.
Phisics in first class1
You just have trust the equation. I can't do that.. since real science is based on science. I know we dont have science a space station. How do it we experiment?
You don't have to trust the equation experiments have proved entanglement many times.
You can buy a kit and do the experiments yourself at home it cost a couple thousand though.
Ha ha Nobody asks questions?
This is false math do not follow..
💀
The two particles are entangled because they are the result of a conservation law. So there is no weirdness and no spooky action at a distance. See my detailed explanation at: vixra.org/pdf/1608.0350v1.pdf