UVCC

class UVCC(num_qubits, basis, degrees, reps=1, excitations=None, initial_state=None, qubit_mapping='direct', num_time_slices=1, shallow_circuit_concat=True)

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

This trial wavefunction is a Unitary Vibrational Coupled-Cluster Single and Double excitations variational form. For more information, see Ollitrault Pauline J., Chemical science 11 (2020): 6842-6855.

Parameters

• num_qubits (int) – number of qubits

• basis (List[int]) – Is a list defining the number of modals per mode. E.g. for a 3 modes system with 4 modals per mode basis = [4,4,4]

• degrees (List[int]) – degree of excitation to be included (for single and double excitations degrees=[0,1])

• reps (int) – number of replica of basic module

• excitations (Optional[List[List[List[int]]]]) – The excitations to be included in the circuit. If not provided the default is to compute all singles and doubles.

• initial_state (Union[QuantumCircuit, InitialState, None]) – An initial state object.

• qubit_mapping (str) – the qubits mapping type. Only ‘direct’ is supported at the moment.

• num_time_slices (int) – parameters for dynamics.

• shallow_circuit_concat (bool) – indicate whether to use shallow (cheap) mode for circuit concatenation

Methods

compute_excitation_lists	Compute the list with all possible excitation for given orders
construct_circuit	Construct the variational form, given its parameters.
excitations_in_qubit_format	Gives the list of excitation indexes in terms of qubit indexes rather
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