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)[código fonte]¶

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.

Parâmetros

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

__init__(num_qubits, basis, degrees, reps=1, excitations=None, initial_state=None, qubit_mapping='direct', num_time_slices=1, shallow_circuit_concat=True)[código fonte]¶

Parâmetros

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

`__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)[código fonte]¶

Compute the list with all possible excitation for given orders

Parâmetros

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])

Tipo de retorno

List[List[int]]

Retorna

List of excitation indexes in terms of modes and modals

Levanta

ValueError – If excitation degree is greater than size of basis

construct_circuit(parameters, q=None)[código fonte]¶

Construct the variational form, given its parameters.

Parâmetros

parameters (Union[ndarray, List[Parameter], ParameterVector]) – circuit parameters
q (Optional[QuantumRegister]) – Quantum Register for the circuit.

Tipo de retorno

QuantumCircuit

Retorna

Quantum Circuit a quantum circuit with given parameters

Levanta

ValueError – the number of parameters is incorrect.
ValueError – if num_qubits has not been set and is still None

excitations_in_qubit_format()[código fonte]¶

Gives the list of excitation indexes in terms of qubit indexes rather: than in modes and modals

Tipo de retorno: List[List[int]]
Retorna: 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.

Retorna: An integer indicating the number of parameters.
Tipo de retorno: int

property num_qubits¶

Number of qubits of the variational form.

Retorna: An integer indicating the number of qubits.
Tipo de retorno: int

property parameter_bounds¶

Parameter bounds.

Retorna: 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.
Tipo de retorno: 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.

Retorna: indicate the sub-class support parameterized circuit
Tipo de retorno: boolean

static validate_entangler_map(entangler_map, num_qubits)¶: validate entangler map