In the course
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10 videos · 5 h 37 min
Explainer · YouTube
minutephysics
Made with 3Blue1Brown, this reaches the same contradiction by a different road: three polarising filters and a Venn diagram that pre-written answers cannot satisfy. Compare its counting argument with the CHSH card argument in Part 3.
Explainer · YouTube
Looking Glass Universe
A six-minute beginner's episode on what Bell's theorem says about whether quantum mechanics is true, a gentle first pass before this section's cards of pre-written answers. A companion video on the same channel, 'Proof of Bell's theorem', then works through the argument.
Explainer · YouTube
udiprod
An animated walk through the game in this section: the rules of the CHSH game, the classical bound (Part 2, 1:56), a quantum strategy built on spin (Part 4, 13:44) and why it still cannot send a signal (Part 6, 18:48). Watch it right before today's lab.
Documentary · YouTube
NOVA PBS Official
NOVA follows an experiment in the Canary Islands that uses light from across the universe to test entanglement, a cosmic Bell test of the kind in this section's last paragraph. The start jumps to its chapter on loopholes (39:02), with the results at 45:20; the opening chapters retell EPR (15:26) and the first entanglement experiment (27:11) for a general audience.
Explainer · YouTube
Sabine Hossenfelder
Hossenfelder separates two kinds of non-locality, then defines local causality (12:32) and measurement independence (16:34) before reaching Bell's theorem (19:55): the assumptions this section says a violation forces you to choose among. Bear in mind that she defends superdeterminism, the option that drops measurement independence, so her conclusion is one of the readings listed here, not the settled verdict.
Lecture · MIT
MIT OpenCourseWare · Allan Adams · 2013
A full MIT 8.04 lecture by Allan Adams. The first part previews quantum computing (the no-cloning theorem, met briefly in Part 5 and fully in Chapter 24, and the Deutsch–Jozsa algorithm of Chapter 23); the last part is devoted to the EPR experiment and Bell's inequality, the ideal bridge from this chapter to the next. Best watched after the lesson.
Lecture · Nobel Prize
Nobel Prize · Alain Aspect · 2022
"From Einstein's doubts to quantum technologies": Alain Aspect on his Orsay experiments of the early 1980s, which tested Bell's inequality with fast-switching polarizers, and on how entanglement went from philosophical puzzle to technological resource.
Lecture · Nobel Prize
Nobel Prize · John F. Clauser · 2022
"Experimental proof that nonlocal quantum entanglement is real": John Clauser on the 1972 Freedman–Clauser experiment at Berkeley, the first experimental test of a Bell inequality, and what it took to build it.
Lecture · Nobel Prize
Nobel Prize · Anton Zeilinger · 2022
"A Voyage through Quantum Wonderland": Anton Zeilinger on quantum teleportation, entanglement swapping and loophole-free Bell tests, told by the physicist whose group performed many of those experiments.
Explainer · IBM Quantum
Qiskit
IBM's Qiskit team builds Bell's inequality from scratch for newcomers, in the wake of the 2022 Nobel Prize. Watch for the moment an argument about 'reality' turns into an inequality that an experiment can check; today you will meet it as a single number, S.