Lesson map
Observe the stack from the ground up.
Lessons 1-5 are open. Pro unlocks the full stack.
Continue into tunneling, atoms, qubits, hardware, sensing, cryptography, field theory, and foundations with all 72 lessons and the full simulator library.
The core mechanics of quantum behavior: superposition, measurement, interference, uncertainty, tunneling, and bound states.
The Strange Quantum World
There's another world below atoms
FreeSuperposition
The particle is everywhere at once
FreeThe Wave Function
ψ(x,t) — the math of possibility
FreeMeasurement
Looking is what makes things real
FreeThe Double Slit
One particle going through two slits
FreeWave-Particle Duality
Light is both — and so are you
LockedUncertainty
Some things can't be known at the same time
LockedQuantum Tunneling
Particles walk through walls
LockedThe Schrödinger Equation
The equation that runs the universe
LockedStationary States
Standing waves in a quantum world
LockedThe Particle in a Box
What happens when you trap a wave
LockedHydrogen
How an electron orbits without orbiting
LockedSpin, orbitals, exclusion, bonding, spectra, and the coherent light that makes lasers possible.
Spin
Particles spin without spinning
LockedThe Stern-Gerlach Experiment
The experiment that found spin
LockedPauli Exclusion
Why every atom has a shape
LockedMulti-Electron Atoms
When electrons have to share a house
LockedMolecular Orbitals
Two atoms, one shared cloud
LockedChemical Bonding
Why atoms stick together
LockedSpectroscopy
How light tells you what something is
LockedLasers
Coherent light, plain and simple
LockedQubits, gates, entanglement, teleportation, no-cloning, and the language of noisy quantum states.
Bits and Qubits
Beyond zero and one
LockedThe Bloch Sphere
Every quantum state is a point on a sphere
LockedSingle-Qubit Gates
Rotations of the Bloch sphere
LockedThe CNOT Gate
When two qubits become one
LockedEntanglement
Two particles, one shared destiny
LockedBell States
Einstein was wrong about this one
LockedQuantum Teleportation
Quantum information at any distance
LockedThe No-Cloning Theorem
You can't copy a quantum state
LockedPOVMs
Measurement isn't always yes-or-no
LockedDensity Matrices
Quantum states with imperfect information
LockedQuantum circuits, universal gates, speedups, QFT, Shor, Grover, NISQ algorithms, and error correction.
Quantum Circuits
Reading the circuit diagram
LockedUniversal Quantum Gates
All quantum logic from a small set
LockedDeutsch-Jozsa
The first quantum advantage
LockedGrover Search
Searching faster than possible
LockedQuantum Fourier Transform
The quantum Fourier transform
LockedShor's Algorithm
How quantum computers break encryption
LockedVariational Quantum Eigensolver
Solving chemistry with quantum hardware
LockedQAOA
Approximating impossible optimizations
LockedQuantum Machine Learning
When neural networks meet qubits
LockedNISQ Computing
What today's quantum computers can do
LockedFault Tolerance
Building reliability from unreliability
LockedSurface Codes
The error-correcting code that might win
LockedSuperconducting circuits, trapped ions, photonics, neutral atoms, spin qubits, decoherence, and cryogenics.
Superconducting Qubits
Qubits made of supercooled metal
LockedTrapped Ions
Qubits made of single floating atoms
LockedPhotonic Qubits
Qubits made of light
LockedTopological Qubits
The qubit that's intrinsically protected
LockedNeutral Atoms
Qubits made of atoms held by lasers
LockedSpin Qubits
Qubits inside silicon — the same stuff as your computer
LockedDecoherence
Why quantum computers have to be cold
LockedCryogenics
How to make something colder than space
LockedAtomic clocks, NV centers, gravity sensing, interferometry, LIGO, and imaging with quantum correlations.
Quantum Sensing
Measuring the universe more precisely than physics should allow
LockedAtomic Clocks
The most accurate clocks in existence
LockedNV Centers
A defect in diamond that can sense a single electron
LockedQuantum Gravity Sensing
Detecting the pull of a single grain of rice
LockedLIGO
How LIGO detected colliding black holes
LockedQuantum Imaging
Photographing things with light that never touched them
LockedThe threat from quantum computers, quantum key distribution, Bell-state security, post-quantum algorithms, randomness, and quantum networks.
The Classical Cryptography Problem
Quantum computers will break the internet
LockedBB84
BB84 — the original quantum-secure key exchange
LockedE91
Bell-state cryptography
LockedPost-Quantum Cryptography
Post-quantum cryptography — fighting fire with fire
LockedQuantum Random Number Generation
True randomness from a quantum coin flip
LockedThe Quantum Internet
What a real quantum internet would look like
LockedVacuum activity, QED, Feynman diagrams, path integrals, and the Standard Model as a quantum field theory.
Measurement, interpretation, many worlds, Copenhagen, pilot waves, and QBism without turning mystery into fog.