Circuit Composer

Build a circuit

1. Open Circuit Composer.
2. Select Load example circuit and choose Bell State, or drag gates from the palette onto the circuit.
3. Use the toolbar to add or remove qubits and classical bits.
4. Edit gate parameters when the gate requires them.
5. Inspect the QASM editor and the Probabilities panel as you change the circuit.

The visual circuit and QASM editor stay in sync for supported circuits. Resolve parsing errors before using the circuit. Use Undo or Redo to revise an edit. Clear circuit asks for confirmation before it resets the circuit.

For circuits with conditional gates, the probability panel warns that its simulation shows unconditional results only.

The toolbar shows the circuit’s gate count and depth. The probability preview is a simulator result, separate from a submitted hardware job.

The Bell State example shows the circuit, QASM, and simulated probabilities together.

Run on a device

1. Select Run.
2. Optionally enter a job name.
3. Set the number of Shots.
4. Search for a device and review its provider, qubit count, type, and status.
5. Review the displayed cost estimate or usage-based pricing notice.
6. Select Run on for the chosen device.
7. After submission, select View in Quantum Jobs to follow the job.

Review shots and device availability before selecting a device and submitting a job.

The device picker lists QASM-compatible devices and disables selections the circuit cannot use. A device may be unavailable because it has too few qubits or does not accept submissions in its current state.

For devices with usage-based pricing, the final cost is calculated after the job runs. A probability preview does not submit a hardware job or guarantee its result.

Use the Composer Feedback button to open a support request with the Circuit Composer subject prefilled.

Watch the Composer flow

2× speed; stops before submitting a job.