Build a circuit.
Test a prediction.
Prepare up to four qubits, apply gates, choose a measurement basis, and draw actual finite-shot samples from the ideal state-vector model.
UP TO 4 QUBITS
Model boundary. This is a classical, in-browser simulator of ideal unitary gates. It is not quantum hardware and does not include noise, mid-circuit measurement, or error correction. You can export OpenQASM 2 to run elsewhere; check the target device support and bit-order convention first.
Compose operations
No gates yet. Add an operation or load a prepared circuit.
The selected Pauli basis is applied to every qubit.
Read the result
One point describes the pure state up to a global phase. Z-basis probabilities depend on its vertical coordinate.
1P 1.000Counts will appear here after a run. Repeating the same circuit can produce different samples.
Predict first. Run second.
- Write the state you expect after each gate.
- Predict a measurement distribution in the selected basis.
- Run shots and compare the finite sample to your prediction.
Make a claim you can test.
The advanced track covers uncertainty, controls, and a complete circuit capstone.