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IterativePhaseEstimation

class IterativePhaseEstimation(num_iterations, quantum_instance=None, sampler=None)[source]

Bases: PhaseEstimator

Run the Iterative quantum phase estimation (QPE) algorithm.

Given a unitary circuit and a circuit preparing an eigenstate, return the phase of the eigenvalue as a number in \([0,1)\) using the iterative phase estimation algorithm.

[1]: Dobsicek et al. (2006), Arbitrary accuracy iterative phase estimation algorithm as a two

qubit benchmark, arxiv/quant-ph/0610214

Parameters
  • num_iterations (int) -- The number of iterations (rounds) of the phase estimation to run.

  • quantum_instance (QuantumInstance | Backend | None) -- Pending deprecation: The quantum instance on which the circuit will be run.

  • sampler (BaseSampler | None) -- The sampler primitive on which the circuit will be sampled.

Raises
  • ValueError -- if num_iterations is not greater than zero.

  • AlgorithmError -- If neither sampler nor quantum instance is provided.

Methods

construct_circuit

Construct the kth iteration Quantum Phase Estimation circuit.

estimate

Estimate the eigenphase of the input unitary and initial-state pair.