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10 videos · 6 h 52 min
Explainer · YouTube
Up and Atom
Jade introduces quantum key distribution, the simplest form of quantum cryptography, and shows why an eavesdropper cannot read the key without disturbing it: the idea behind the BB84 protocol of Parts 2 and 3 and today's Spy Hunt lab. When the video calls the scheme unbreakable, keep the lesson's fine print in mind: secure in principle, but only as good as its hardware and its authenticated channel.
Explainer · YouTube
minutephysics
A hand-drawn derivation of the complete teleportation protocol: a shared Bell pair, Alice's joint measurement, two classical bits and Bob's correction. Watch it after Part 4 and compare its four cases with the teleportation identity among today's key equations; notice that only the state travels, and only as fast as the two bits.
Explainer · YouTube
Computerphile
Mike Pound explains why the switch to post-quantum cryptography has to start now. It is the other half of Part 5: classical algorithms that run as ordinary software, with no photons, detectors or quantum links, and whose security is computational rather than information-theoretic.
Lecture · Perimeter
Perimeter Institute for Theoretical Physics · Shohini Ghose · 2020
Physicist Shohini Ghose of Wilfrid Laurier University surveys the quantum technologies that grow out of superposition and entanglement, from quantum computers to secure communication. A clear public lecture given at Perimeter Institute in March 2020.
Lecture · IBM Quantum
Qiskit · John Watrous · 2022–25
The lecture from IBM Quantum Understanding Quantum Information & Computation (John Watrous, 2022–25) that goes with Chapter 20. The whole course is in the Lecture Hall.
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.
Lecture · Royal Institution
The Royal Institution
NPL's chief scientist, JT Janssen, explains how atomic magnetometers sense magnetic fields and how atom interferometers measure gravity, acceleration and rotation, including NPL's work on gravimeters based on a double rubidium atomic fountain: the sensors of Part 6, from the laboratory that built the first practical caesium clock. A long but rewarding lecture on fragile quantum states turned into precision tools.
Lecture · Heidelberg Laureate Forum
Heidelberg Laureate Forum · Charles H. Bennett & Gilles Brassard
"The Quantum Information Revolution from Wiesner to Turing": the inventors of BB84, and two of the six authors of the 1993 teleportation paper, lecture together as laureates of the 2025 ACM A.M. Turing Award. The Wiesner of the title is Stephen Wiesner, whose uncopyable quantum money (Part 2) set the whole story going.
Lecture · Yale
Yale University · Steve Girvin
Yale physicist Steve Girvin gives a full lecture on secure communication with the BB84 key-distribution protocol, motivated by the threat quantum computing poses to today's encryption. Watch it after Part 3, with the 25 percent error fingerprint and the (3/4)ⁿ odds of Eve slipping through in hand as a check on the eavesdropping argument.
Explainer · IBM Quantum
Qiskit · Katie McCormick
Katie McCormick walks through quantum teleportation for IBM's Qiskit in the Classroom series. Match each step to Part 4 (shared Bell pair, Bell-state measurement, two classical bits, Bob's X and Z corrections) and to the teleportation identity among the key equations.