qiskit.chemistry.components.variational_forms.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)

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.

パラメータ

• 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 (Optional[InitialState]) – 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

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

パラメータ

• 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 (Optional[InitialState]) – 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

__init__(num_qubits, basis, degrees[, reps, …])	type num_qubits int
compute_excitation_lists(basis, degrees)	Compute the list with all possible excitation for given orders
construct_circuit(parameters[, q])	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(map_type, num_qubits[, offset])	returns entangler map
validate_entangler_map(entangler_map, num_qubits)	validate entangler map

Attributes

num_parameters	Number of parameters of the variational form.
num_qubits	Number of qubits of the variational form.
parameter_bounds	Parameter bounds.
preferred_init_points	Return preferred init points.
setting
support_parameterized_circuit	Whether or not the sub-class support parameterized circuit.

static compute_excitation_lists(basis, degrees)

Compute the list with all possible excitation for given orders

パラメータ

• 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])

戻り値の型

List[List[int]]

戻り値

List of excitation indexes in terms of modes and modals

例外

ValueError – If excitation degree is greater than size of basis

construct_circuit(parameters, q=None)

Construct the variational form, given its parameters.

パラメータ

• parameters (Union[ndarray, List[Parameter], ParameterVector]) – circuit parameters

• q (Optional[QuantumRegister]) – Quantum Register for the circuit.

戻り値の型

QuantumCircuit

戻り値

Quantum Circuit a quantum circuit with given parameters

例外

• ValueError – the number of parameters is incorrect.

• ValueError – if num_qubits has not been set and is still None

excitations_in_qubit_format()

Gives the list of excitation indexes in terms of qubit indexes rather

than in modes and modals

戻り値の型

List[List[int]]

戻り値

List of excitation indexes

static get_entangler_map(map_type, num_qubits, offset=0)

returns entangler map

property num_parameters

Number of parameters of the variational form.

戻り値

An integer indicating the number of parameters.

戻り値の型

int

property num_qubits

Number of qubits of the variational form.

戻り値

An integer indicating the number of qubits.

戻り値の型

int

property parameter_bounds

Parameter bounds.

戻り値

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.

戻り値の型

list

property 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

property setting

property support_parameterized_circuit

Whether or not the sub-class support parameterized circuit.

戻り値

indicate the sub-class support parameterized circuit

戻り値の型

boolean

static validate_entangler_map(entangler_map, num_qubits)

validate entangler map