EigsQPE¶

class EigsQPE(operator, iqft, num_time_slices=1, num_ancillae=1, expansion_mode='trotter', expansion_order=1, evo_time=None, negative_evals=False, ne_qfts=None)[source]¶

Bases: qiskit.aqua.components.eigs.eigs.Eigenvalues

Eigenvalues using Quantum Phase Estimation.

Specifically, this class is based on PhaseEstimationCircuit with no measurements and has additional handling of negative eigenvalues, e.g. for HHL. It depends on the QFT class.

Parameters

operator (LegacyBaseOperator) – The Hamiltonian Operator object
iqft (QuantumCircuit) – The Inverse Quantum Fourier Transform circuit
num_time_slices (int) – The number of time slices, has a minimum value of 1.
num_ancillae (int) – The number of ancillary qubits to use for the measurement, has a minimum value of 1.
expansion_mode (str) – The expansion mode (‘trotter’ | ‘suzuki’)
expansion_order (int) – The suzuki expansion order, has a minimum value of 1.
evo_time (Optional[float]) – An optional evolution time which should scale the eigenvalue onto the range $(0,1]$ (or $(-0.5,0.5]$ for negative eigenvalues). Defaults to None in which case a suitably estimated evolution time is internally computed.
negative_evals (bool) – Set True to indicate negative eigenvalues need to be handled
ne_qfts (Optional[List]) – The QFT and IQFT circuits for handling negative eigenvalues

Methods

`construct_circuit`	Construct the eigenvalues estimation using the PhaseEstimationCircuit
`construct_inverse`	Construct the inverse eigenvalue estimation quantum circuit.
`get_register_sizes`	get register sizes
`get_scaling`	get scaling