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10 videos · 5 h
Series · Perimeter
Perimeter Institute for Theoretical Physics · Katie Mack · 2023
Ten five-minute episodes hosted by the cosmologist Katie Mack: duality, quantization, uncertainty, superposition, entanglement, probability, tunnelling and quantum computing. The friendliest possible on-ramp, and a quick refresher before any chapter.
Course · MIT
MIT OpenCourseWare · Allan Adams · 2013
Allan Adams' celebrated course starts from superposition and the experimental facts, builds the wavefunction, operators and the Schrödinger equation, then tours scattering, hydrogen, identical particles and band structure before closing on entanglement and Bell's theorem. Calculus and a little linear algebra are enough to keep up.
Lecture · University of Padova
Aula Rostagni UniPadova DFA · Gerald Gabrielse
A Padova physics colloquium (30 March 2023) from Gerald Gabrielse, whose Northwestern group made the measurement section 5 quotes, on measuring the electron's magnetic moment with a single electron held in a trap he calls a quantum cyclotron. Expect professional detail; listen for the fine-structure constant, which the lesson names as the current limit on the theory-experiment comparison.
Lecture · MIT
MIT OpenCourseWare · Barton Zwiebach
Zwiebach contrasts classical superposition of fields with the quantum kind using single photons in a Mach-Zehnder interferometer, then states the rule this section builds on: measure a property on αA + βB and you never get anything in between, only a or b, with odds set by |α|² and |β|², after which the state is the one you found. When he says a photon is 'in both beams at the same time', translate it into this section's language (one definite state written as a sum of two path states), and catch his point at about 7:30 that the same vector can be written as a sum in many different ways.
Lecture · MIT
MIT OpenCourseWare · Barton Zwiebach
Starts at 7:55, where Zwiebach states the measurement postulate as this section does: the result is always an eigenvalue, its probability is |αᵢ|², the squared overlap with the eigenstate, and the state collapses to that eigenstate, so an immediate repeat gives the same value; rewind to the beginning to see how any state is expanded in eigenfunctions and why the |αᵢ|² add up to 1. Stay for 15:10, where he calls it 'a very strange postulate' that splits quantum mechanics into the realm of the Schrödinger equation and the realm of measurement, a preview of section 6.
Short · Washington University in St. Louis
Washington University in St. Louis
A three-minute university video on Kater Murch's group, who probed the role of measurement in the Zeno effects with an artificial-atom qubit, including a 'quasimeasurement' interaction that only disturbs it; Murch calls the results the first observation of the two Zeno effects on a single quantum system. It sharpens this section's lesson that what freezes a quantum state is a physical interaction, not anybody looking.
Lecture · Uppsala University
Uppsala universitet · Serge Haroche
Haroche, whose group ran the 1996 Paris experiment in this section, gives a public version of his Nobel talk 'Controlling photons in a box and exploring the quantum to classical boundary' (the Stockholm lecture itself is in the Lecture Hall). It starts at 40:10, where a single atom prepares a Schrödinger-cat state of light, followed at 42:37 by 'Fifty milliseconds in the life of a Schrödinger cat': the laboratory version of this section's question of how fast a superposition of distinguishable states fades.
Lecture · Yale
YaleCourses · Ramamurti Shankar · 2010
The lecture from Yale University PHYS 201 Fundamentals of Physics II (Ramamurti Shankar, 2010) that goes with Chapter 15. The whole course is in the Lecture Hall.
Lecture · Caltech
John Preskill · 2021
The lecture from Caltech Ph/CS 219A Quantum Computation (John Preskill, 2021) that goes with Chapter 15. The whole course is in the Lecture Hall.
Explainer · YouTube
Domain of Science
Dominic Walliman's illustrated tour of the whole quantum landscape, explained directly rather than through analogies: wave-particle duality, superposition, uncertainty, entanglement, energy quantization and more. Treat it as a map of the territory, and as you watch, try to spot the five big ideas this lesson names.