Lecture 6 | Quantum Entanglements, Part 1 (Stanford)
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Lecture 6 of Leonard Susskind's course concentrating on Quantum Entanglements (Part 1, Fall 2006). Recorded October 30, 2006 at Stanford University. This Stanford Continuing Studies course is the first of a three-quarter sequence of classes exploring the "quantum entanglements" in modern theoretical physics. Leonard Susskind is the Felix Bloch Professor of Physics at Stanford University. Complete playlist for the course: http://www.youtube.com/view_play_list?p=A27CEA1B8B27EB67 Stanford Continuing Studies: http://continuingstudies.stanford.edu/ About Leonard Susskind: http://www.stanford.edu/dept/physics/people/faculty/sussk... Stanford University channel on YouTube: http://www.youtube.com/stanford
Comments
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Can we somehow identify? Flies whether our Schwarzschild sphere(the entire universe) somewhere in the space in which it is located?
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Question: What if a second measuring device was placed right after the first measuring device, putting the electron's spin configuration back into its original state (spin up). Then all of the equations would be the same as when there was no measuring device. In this case wouldn't the equations predict that there WILL be an interference pattern?
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A Quantum Entanglement Revenge
I'm just a miserable bunch of quantum field excitations. A bag of bags of quarks. And so's my truck.
I was entangled with a gal, but things went South. We're still ensnared— there’s no divorce.
Dark energy, dark matter, dark thoughts-- I'll go to the dark side and jump in a black hole.
That'll teach you, bit.... [loss of signal] -
The sound is very low when prof. Susskind talks.
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is entanglement the only reason why bells inequality is violated? can it be violated in a non entangled system?
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How strong does the magnetic field need to be to make a measurement? The earth magnetic field isn't strong enough? Or does the average time for the electron to emit a photon depend on the size of the magnetic field?
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I'm reticent to accept that entanglement forces nonlocality. Is there any reason I shouldn't instead conclude that space is made of entanglement? (i.e. Two entangled entities are literally spatially adjacent.)
Please take this question seriously, it's something I've thought deeply about. -
Amazing lecture.
For the first time in this series , I can actually hear many of the questions -- pity that I can barely hear Susskind and the lecture itself ! -
Look at that genius put away those cookies!
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Where is the depth of the slit in relation to the wave represented? This would directly affect the resulting entanglement, wouldn't it?
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What we find when we measure is that the electron NEVER goes through both slits. It either goes via (1) or (-1) When we detect (1 or -1), the wave function "collapses" and we have NO interference at back plane Canceling entanglement is not possible. If we "detect", then we entangle 100% of time and receive no interference. If we do NOT detect, we do not entangle 100% of time and DO receive interference. Observation CREATES entanglement and destroys interference.(given proper test setup)
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There is one of these guys in every class in every college in America. I agree, that guy is particularly annoying, but I had a particularly annoying guy in every class I took in college. I had a rule - I only opened my mouth if I had a real question, and only then if I had a question I thought others might have. Otherwise, I either asked the question to the prof alone after class, or I figured the answer out myself.
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So gracious of the good prof to give elementary lectures, given the depth and breadth of his accomplishments.
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If we design an apparatus which does not alter the spin of the electron when it gets through the slit, then I think, entanglement can be prevented, or if we put the apparatus in the path of electron going through both the slits, then we can cancel the entanglement, but I am not sure about it. Can anyone explain ?
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awful audio mixing
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@MuggsMcGinnis At minute 36, the camera-person does it exactly right. Letting Susskind step into and out of the field while displaying clearly the entire contents of the white board.
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@zeperf88 A given electron might be observed in different ways. You measure the spin of an electron with a magnetic field. The field orientation will always be observed to be either in alignment or opposition (anti-alignment) to the imposed magnetic field. If a beam of electrons are polarized to be perpendicular to the field, 1/2 will be observed to be aligned with the field (no photon) & 1/2 pointed the other way (photon emission).
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Advice to the camera-person: It's less important to keep the speaker centered than it is to show what they are talking about. When he points to an equation, focus on the equation, even if only his hand remains in the frame. It's not like videoing a dance, you're helping people take notes.
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