CHC¶

class CHC(num_qubits=None, reps=1, ladder=False, excitations=None, entanglement='full', initial_state=None)[source]¶

Bases: qiskit.aqua.components.variational_forms.variational_form.VariationalForm

This trial wavefunction is the Compact Heuristic for Chemistry.

The trial wavefunction is as defined in Ollitrault Pauline J., Chemical science 11 (2020): 6842-6855. It aims at approximating the UCC Ansatz for a lower CNOT count.

Note

It is not particle number conserving and the accuracy of the approximation decreases with the number of excitations.

Parameters

num_qubits (Optional[int]) – number of qubits
reps (int) – number of replica of basic module
ladder (bool) – use ladder of CNOTs between to indices in the entangling block
excitations (Optional[List[List[int]]]) – indices corresponding to the excitations to include in the circuit
entanglement (Union[str, List[int]]) – physical connections between the qubits
initial_state (Union[QuantumCircuit, InitialState, None]) – an initial state to prepend to the variational form

Methods

`construct_circuit`	Construct the variational form, given its parameters.
`get_entangler_map`	returns entangler map
`validate_entangler_map`	validate entangler map

Attributes

num_parameters¶

Number of parameters of the variational form.

Returns: An integer indicating the number of parameters.
Return type: int

num_qubits¶

Number of qubits of the variational form.

Returns: An integer indicating the number of qubits.
Return type: int

parameter_bounds¶

Parameter bounds.

Returns: A list of pairs indicating the bounds, as (lower, upper). None indicates an unbounded parameter in the corresponding direction. If None is returned, problem is fully unbounded.
Return type: list

preferred_init_points¶

Return preferred init points.

If an initial state is provided then the variational form may provide back this set of parameters which when used on the variational form should result in the overall state being that defined by the initial state

setting¶

support_parameterized_circuit¶

Whether or not the sub-class support parameterized circuit.

Returns: indicate the sub-class support parameterized circuit
Return type: boolean