qiskit.algorithms.PhaseEstimation.estimate

PhaseEstimation.estimate(unitary=None, state_preparation=None, pe_circuit=None, num_unitary_qubits=None)

Build a phase estimation circuit and run the corresponding algorithm.

Parameters

• unitary (Optional[QuantumCircuit]) – The circuit representing the unitary operator whose eigenvalues (via phase) will be measured.

• state_preparation (Optional[QuantumCircuit]) – The circuit that prepares the state whose eigenphase will be measured. If this parameter is omitted, no preparation circuit will be run and input state will be the all-zero state in the computational basis.

Return type

PhaseEstimationResult

Returns

An instance of qiskit.algorithms.phase_estimator_result.PhaseEstimationResult.