Start
The Strange Quantum World
There's another world below atoms
Quantum Physics
Follow nature from wave functions and atoms into qubits, hardware, sensing, secure communication, and quantum fields.
Begin where everyday intuition stops working.
Reality before vocabulary
Foundations
Keep exploring
Superposition
The particle is everywhere at once
Keep exploring
The Wave Function
ψ(x,t) — the math of possibility
Keep exploring
Measurement
Looking is what makes things real
Keep exploring
The Double Slit
One particle going through two slits
Keep exploring
Wave-Particle Duality
Light is both — and so are you
Keep exploring
Uncertainty
Some things can't be known at the same time
Keep exploring
Quantum Tunneling
Particles walk through walls
Keep exploring
The Schrödinger Equation
The equation that runs the universe
Keep exploring
Stationary States
Standing waves in a quantum world
Keep exploring
The Particle in a Box
What happens when you trap a wave
Keep exploring
Hydrogen
How an electron orbits without orbiting
How matter gets its structure
Atomic & Molecular Physics
Keep exploring
Spin
Particles spin without spinning
Keep exploring
The Stern-Gerlach Experiment
The experiment that found spin
Keep exploring
Pauli Exclusion
Why every atom has a shape
Keep exploring
Multi-Electron Atoms
When electrons have to share a house
Keep exploring
Molecular Orbitals
Two atoms, one shared cloud
Keep exploring
Chemical Bonding
Why atoms stick together
Keep exploring
Spectroscopy
How light tells you what something is
Keep exploring
Lasers
Coherent light, plain and simple
From bits to qubits
Quantum Information
Keep exploring
Bits and Qubits
Beyond zero and one
Keep exploring
The Bloch Sphere
Every quantum state is a point on a sphere
Keep exploring
Single-Qubit Gates
Rotations of the Bloch sphere
Keep exploring
The CNOT Gate
When two qubits become one
Keep exploring
Entanglement
Two particles, one shared destiny
Keep exploring
Bell States
Einstein was wrong about this one
Keep exploring
Quantum Teleportation
Quantum information at any distance
Keep exploring
The No-Cloning Theorem
You can't copy a quantum state
Keep exploring
POVMs
Measurement isn't always yes-or-no
Keep exploring
Density Matrices
Quantum states with imperfect information
Algorithms as physical operations
Quantum Computing
Keep exploring
Quantum Circuits
Reading the circuit diagram
Keep exploring
Universal Quantum Gates
All quantum logic from a small set
Keep exploring
Deutsch-Jozsa
The first quantum advantage
Keep exploring
Grover Search
Searching faster than possible
Keep exploring
Quantum Fourier Transform
The quantum Fourier transform
Keep exploring
Shor's Algorithm
How quantum computers break encryption
Keep exploring
Variational Quantum Eigensolver
Solving chemistry with quantum hardware
Keep exploring
QAOA
Approximating impossible optimizations
Keep exploring
Quantum Machine Learning
When neural networks meet qubits
Keep exploring
NISQ Computing
What today's quantum computers can do
Keep exploring
Fault Tolerance
Building reliability from unreliability
Keep exploring
Surface Codes
The error-correcting code that might win
Turning equations into machines
Quantum Hardware
Keep exploring
Superconducting Qubits
Qubits made of supercooled metal
Keep exploring
Trapped Ions
Qubits made of single floating atoms
Keep exploring
Photonic Qubits
Qubits made of light
Keep exploring
Topological Qubits
The qubit that's intrinsically protected
Keep exploring
Neutral Atoms
Qubits made of atoms held by lasers
Keep exploring
Spin Qubits
Qubits inside silicon — the same stuff as your computer
Keep exploring
Decoherence
Why quantum computers have to be cold
Keep exploring
Cryogenics
How to make something colder than space
Measurement pushed to the edge
Quantum Sensing
Keep exploring
Quantum Sensing
Measuring the universe more precisely than physics should allow
Keep exploring
Atomic Clocks
The most accurate clocks in existence
Keep exploring
NV Centers
A defect in diamond that can sense a single electron
Keep exploring
Quantum Gravity Sensing
Detecting the pull of a single grain of rice
Keep exploring
LIGO
How LIGO detected colliding black holes
Keep exploring
Quantum Imaging
Photographing things with light that never touched them
Security from physics
Quantum Cryptography
Keep exploring
The Classical Cryptography Problem
Quantum computers will break the internet
Keep exploring
BB84
BB84 — the original quantum-secure key exchange
Keep exploring
E91
Bell-state cryptography
Keep exploring
Post-Quantum Cryptography
Post-quantum cryptography — fighting fire with fire
Keep exploring
Quantum Random Number Generation
True randomness from a quantum coin flip
Keep exploring
The Quantum Internet
What a real quantum internet would look like
Fields under every particle
QFT & Beyond
Keep exploring
The Quantum Vacuum
Empty space is full of activity
Keep exploring
Quantum Electrodynamics
How light and matter actually interact
Keep exploring
Feynman Diagrams
Drawing the impossible
Keep exploring
Path Integrals
All paths at once
Keep exploring
The Standard Model
What the universe is made of, plain and simple
What quantum theory says about reality
Foundations & Philosophy
Keep exploring
The Measurement Problem
Why measurement is still a mystery
Keep exploring
Many Worlds
Every measurement creates a universe
Keep exploring
Copenhagen
The standard interpretation, examined
Keep exploring
Pilot Wave Theory
What if particles really do have positions?
Keep exploring
QBism
What if the wave function is just a tool?