Quantum
Dive into the counterintuitive world of quantum mechanics, where particles behave like waves, measurement changes reality, and entanglement creates spooky action at a distance. These interactive simulations let you manipulate quantum states, explore interference and decoherence, run quantum algorithms, and see the strange predictions of quantum theory come to life.
Wave-Particle Duality & Interference
Watch quantum particles interfere with themselves and explore the fundamental mystery of wave-particle duality. See how measurement destroys interference and how quantum erasure can restore it.
The Double-Slit Experiment
Fire particles one at a time and watch interference patterns build up—turn on decoherence to destroy quantum behavior
Mach-Zehnder Quantum Interferometer
Guide single photons through beam splitters and phase shifters—add which-path detectors to erase interference, then erase the erasure
Delayed-Choice Quantum Eraser
Choose whether to measure which-path information after photons have already gone through slits—see how information, not timing, determines interference
Quantum States & Control
Build quantum circuits, manipulate spin states, and drive qubits with resonant fields. Master the Bloch sphere representation and watch quantum gates transform superposition states.
Quantum Circuit Builder
Build quantum circuits with up to 3 qubits—apply gates and watch states evolve on Bloch spheres
Stern-Gerlach Spin Interferometer
Send spin-½ particles through Stern-Gerlach magnets—rotate and recombine beams to see quantum interference
Rabi Oscillations & Decoherence
Drive a qubit with resonant light and watch it oscillate on the Bloch sphere—add decoherence to see damped oscillations
Measurement & Decoherence
Explore how measurement collapses quantum states and how continuous monitoring freezes quantum evolution. See how interaction with the environment destroys coherence through which-path information.
Entanglement & Nonlocality
Create entangled states and watch correlations violate Bell inequalities. Teleport quantum states using entanglement and see two-photon interference from indistinguishable particles.
Bell Inequality & Quantum Nonlocality
Measure entangled particles at different angles and compute CHSH correlations—watch quantum mechanics violate local realism
Quantum State Teleportation
Teleport quantum states using entanglement and classical communication—verify that no information travels faster than light
Hong-Ou-Mandel Two-Photon Interference
Send two indistinguishable photons into a beam splitter—watch them bunch together instead of separating
Quantum Algorithms & Information
Run quantum algorithms that outperform classical computation. Search databases with Grover's algorithm and protect quantum information from errors with quantum error correction codes.
Quantum Dynamics & Coherent Control
Watch quantum particles walk on lattices, sweep through avoided crossings, and refocus decoherence with spin echo pulses. Master coherent control of quantum systems.
Quantum Random Walk
Watch a quantum particle walk on a lattice with a coin flip at each step—compare ballistic spreading to classical diffusion
Landau-Zener Avoided Crossing
Sweep a two-level system through an avoided crossing—adjust speed to transition between adiabatic and diabatic behavior
Spin Echo
Dynamical decoupling and refocusing
Geometric Phases & Hidden Variables
Discover geometric phases from cyclic evolution and gauge-invariant Aharonov-Bohm effects. Explore pilot-wave interpretations with deterministic Bohmian trajectories.
