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10 videos · 3 h 40 min
Explainer · YouTube
Parth G
Parth G starts from an ordinary spring and builds up to its quantum version, explaining why physicists keep reaching for the harmonic oscillator. Watch with two questions in mind, both answered in full this session: why do the quantum energy steps come out exactly equal, and why is the lowest step not zero?
Explainer · YouTube
Physics with Elliot
Elliot's case for why physicists put the harmonic oscillator first: almost every system, nudged a little away from equilibrium, behaves like one. Watch it as the long version of section 1's zoom-in argument, where any smooth valley looks like a parabola up close.
Explainer · YouTube
Sabine Hossenfelder
Section 3 says a quantum spring keeps jiggling even at absolute zero; in this six-minute news explainer Sabine Hossenfelder reports on a new experiment presented as showing that zero-point motion directly. As you watch, keep the section's bargain in mind: the jiggle is the uncertainty principle's minimum, not leftover heat, so no amount of cooling removes it.
Explainer · YouTube
Richard Behiel
A brief conceptual overview of the quantum oscillator, which its description says aims at visual intuition. Use it to picture section 4's stationary states, and count the nodes as you go: the state on rung n crosses zero exactly n times.
Explainer · YouTube
Reactions
A chemistry channel's answer to the question behind section 6's greenhouse example: what actually happens when a carbon dioxide molecule meets infrared light? As you watch, apply the section's rule: a vibration can absorb infrared only if it changes the molecule's dipole moment, which is why N₂ and O₂ barely absorb any.
Explainer · YouTube
Physics Explained
The video builds a field out of oscillators and then quantizes it. Its chapter markers put "What Are Fields" at 15:58, where this starts, and the quantum harmonic oscillator and quantum field theory at 21:50 and 25:16. That is section 7's idea: a particle is one quantum of one field oscillator. Start from 0:00 instead if you want the build-up through simple harmonic motion (1:07) and classical mechanical waves (6:05).
Demo · YouTube
Gerd Breitenbach
Measured noise data of the light field, not a simulation: a coherent state and several squeezed states, with their wave packets moving over time. It was posted by Gerd Breitenbach, first author, with Stephan Schiller and Jürgen Mlynek, of the 1997 Nature paper "Measurement of the quantum states of squeezed light". Watch the coherent state's packet swing while keeping its width, as section 8 promises, then see how each squeezed state trades a narrower spread in one quantity for a wider one in the other.
Lecture · Nobel Prize
Nobel Prize · Michel H. Devoret · 2025
"From macroscopic quantum phenomena to artificial atoms": Michel Devoret on how a circuit's quantized energy levels — measured in the same experiments — became the foundation of today's superconducting qubits.
Lecture · MIT
MIT OpenCourseWare
Allan Adams's lecture from MIT's 8.04 Quantum Physics I (Spring 2013) solves the oscillator a second way, with raising and lowering operators instead of a differential equation. The algebra runs ahead of this course, but watch how a single commutation rule between the two operators generates the entire evenly spaced ladder, a structure Adams promises you will meet again all the way up to quantum field theory.
Lecture · Stanford
David Miller Quantum Mechanics Courses · David A. B. Miller
A segment of David Miller's Stanford quantum mechanics course that sets up the oscillator's Schrödinger equation and its solutions. At 19 minutes it is a much shorter pass at section 2 than the 81-minute MIT lecture in the Lecture Hall; check that his energy levels come out evenly spaced, starting at ½ħω.