qiskit.aqua.components.eigs.EigsQPE

__init__(operator, iqft, num_time_slices=1, num_ancillae=1, expansion_mode='trotter', expansion_order=1, evo_time=None, negative_evals=False, ne_qfts=None)

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

construct_circuit(mode, register=None)

Construct the eigenvalues estimation using the PhaseEstimationCircuit

Parameters

• mode (str) – construction mode, ‘matrix’ not supported
• register (QuantumRegister) – the register to use for the quantum state

Returns

object for the constructed circuit

Return type

QuantumCircuit

Raises

ValueError – QPE is only possible as a circuit not as a matrix

construct_inverse(mode, circuit)

Construct the inverse eigenvalue estimation quantum circuit.

Parameters

• mode (str) – construction mode, ‘matrix’ not supported
• circuit (QuantumCircuit) – the quantum circuit to invert

Returns

object for of the inverted eigenvalue estimation

circuit.

Return type

QuantumCircuit

Raises

• NotImplementedError – not implemented for matrix mode
• ValueError – Circuit was not constructed beforehand

get_register_sizes()

get register sizes

get_scaling()

get scaling