Sandbox
The quantum playground
Three qubits, a pile of gates, and no way to break anything permanently. Place gates and the state updates instantly — spheres, amplitudes, entanglement, all read live out of a real simulator. Nine puzzles on the right if you want direction.
Circuit
0 gates
Target qubit
Single-qubit gates
Two-qubit gates (control → target)
Circuit
State
amplitude of each basis state · colour shows phase
Measurement results
Each qubit on its own
q0
q1
q2
q0 entanglementnone
q1 entanglementnone
q2 entanglementnone
A short arrow means that qubit is entangled with the others. A vanished arrow means
it has no state of its own at all.
Puzzles
0 / 9
Pick a puzzle
Choose one below, or just experiment freely.
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