One experiment explains almost everything.
Explore a premium new quantum physics page built around the double-slit experiment, then follow the story outward into amplitude, phase, qubits, interference, entanglement, and why quantum computing works.
The Most Famous Experiment in Physics
In 1801 Thomas Young fired light through two narrow slits and saw something impossible by classical physics. Fire particles one at a time below — then add a detector and watch what happens to the pattern. This single experiment contains all of quantum mechanics.
What changes when a detector watches the slits?
Before turning on the detector, predict what happens to the screen pattern when which-path information becomes available.
The cyan waves are a real-time simulation of quantum amplitude — not probability, but the underlying wave whose square gives probability. The detector collapses "which path" information, which is why the interference disappears.
From your first qubit to real hardware
Most quantum resources stop at the math. This platform connects intuition, simulation, and engineering into one coherent path.
Understand the physics
Start with the double-slit experiment. Watch quantum interference emerge one particle at a time. Build intuition before formalism.
Build real circuits
Drag gates onto qubits. See the state vector update in real time. Watch the Bloch sphere rotate. Understand why measurement destroys superposition.
See the real hardware
Every qubit needs 4 signal cables through 6 temperature stages. Explore a full 3D cryostat with attenuators, amplifiers, and circulators.
Your Quantum Toolkit
From algorithm to hardware — explore both sides of quantum computing with purpose-built interactive tools.
Circuit Lab
Design quantum circuits visually, step through gate-by-gate with live Bloch sphere feedback, and watch superposition, interference, and entanglement emerge in real time.
- Drag-and-drop gate composition
- Live Bloch sphere state tracking
- Step mode with guided explanations
- Mid-circuit probes for amplitude and phase
- Shareable circuits via URL
Cryostat Studio
Engineer a dilution refrigerator from the ground up — place components across thermal stages, route signal chains, and run physics-based thermal simulations.
- Interactive 3D cryostat visualization
- Real-time thermal simulation engine
- Signal chain routing and validation
- Production-grade preset architectures
- Component catalog with real specs
Ready to go deeper?
Explore structured lessons covering states, measurement, operators, gates, interference, and entanglement — each with formulas, intuition, and links to the simulator.