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 Double-Slit Experiment
Fire particles through two slits and watch the pattern form on the screen. Then turn on a detector that reveals which slit each particle went through — and watch the pattern change. This one experiment captures the heart 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 pattern shows the quantum amplitude — the quantity that determines where particles are likely to land. When the detector reveals which slit a particle used, the amplitudes from the two slits can no longer combine, and the interference pattern 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 quantum state update in real time. Watch the Bloch sphere rotate. Understand why measurement changes the state.
See the real hardware
Real qubits need signal cables routed through multiple cooling stages. Explore a full 3D cryostat and see where each component fits.
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 gates to build circuits
- See how each gate changes the qubit's state
- Walk through the circuit one gate at a time
- Inspect the quantum state at any point in the circuit
- Share 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.
- Explore the cryostat in interactive 3D
- Simulate heat flow to verify your design works
- Route cables between stages and check your design
- Start from production-grade preset designs
- Browse real component specs and placement rules
Ready to go deeper?
Twelve lessons covering states, measurement, gates, interference, and entanglement. Each one gives you a plain-language idea, the precise version, a formula, and a link to try it in the simulator.