EvolvedOperatorAnsatz¶

class EvolvedOperatorAnsatz(operators=None, reps=1, evolution=None, insert_barriers=False, name='EvolvedOps', parameter_prefix='t', initial_state=None)[source]¶

Bases : NLocal

The evolved operator ansatz.

Paramètres

operators (Optional[Union[OperatorBase, QuantumCircuit, list]) – The operators to evolve. If a circuit is passed, we assume it implements an already evolved operator and thus the circuit is not evolved again. Can be a single operator (circuit) or a list of operators (and circuits).
reps (int) – The number of times to repeat the evolved operators.
evolution (Optional[EvolutionBase]) – An opflow converter object to construct the evolution. Defaults to Trotterization.
insert_barriers (bool) – Whether to insert barriers in between each evolution.
name (str) – The name of the circuit.
parameter_prefix (Union[str, List[str]]) – Set the names of the circuit parameters. If a string, the same prefix will be used for each parameters. Can also be a list to specify a prefix per operator.
initial_state (Optional[QuantumCircuit]) – A QuantumCircuit object to prepend to the circuit.

Attributes

ancillas¶

Returns a list of ancilla bits in the order that the registers were added.

Type renvoyé: List[AncillaQubit]

calibrations¶

Return calibration dictionary.

The custom pulse definition of a given gate is of the form {'gate_name': {(qubits, params): schedule}}

Type renvoyé: dict

clbits¶

Returns a list of classical bits in the order that the registers were added.

Type renvoyé: List[Clbit]

data¶

entanglement¶

Get the entanglement strategy.

Type renvoyé: Union[str, List[str], List[List[str]], List[int], List[List[int]], List[List[List[int]]], List[List[List[List[int]]]], Callable[[int], str], Callable[[int], List[List[int]]]]
Renvoie: The entanglement strategy, see get_entangler_map() for more detail on how the format is interpreted.

entanglement_blocks¶

The blocks in the entanglement layers.

Type renvoyé: List[Instruction]
Renvoie: The blocks in the entanglement layers.

evolution¶

The evolution converter used to compute the evolution.

Renvoie: The evolution converter used to compute the evolution.
Type renvoyé: EvolutionBase

extension_lib = 'include "qelib1.inc";'¶

global_phase¶

Return the global phase of the circuit in radians.

Type renvoyé: Union[ParameterExpression, float]

header = 'OPENQASM 2.0;'¶

initial_state¶

Return the initial state that is added in front of the n-local circuit.

Type renvoyé: QuantumCircuit
Renvoie: The initial state.

insert_barriers¶

If barriers are inserted in between the layers or not.

Type renvoyé: bool
Renvoie: True, if barriers are inserted in between the layers, False if not.

instances = 2016¶

metadata¶

The user provided metadata associated with the circuit

The metadata for the circuit is a user provided dict of metadata for the circuit. It will not be used to influence the execution or operation of the circuit, but it is expected to be passed between all transforms of the circuit (ie transpilation) and that providers will associate any circuit metadata with the results it returns from execution of that circuit.

Type renvoyé: dict

num_ancillas¶

Return the number of ancilla qubits.

Type renvoyé: int

num_clbits¶

Return number of classical bits.

Type renvoyé: int

num_layers¶

Return the number of layers in the n-local circuit.

Type renvoyé: int
Renvoie: The number of layers in the circuit.

num_parameters¶

Type renvoyé: int

num_parameters_settable¶

The number of total parameters that can be set to distinct values.

This does not change when the parameters are bound or exchanged for same parameters, and therefore is different from num_parameters which counts the number of unique Parameter objects currently in the circuit.

Type renvoyé: int
Renvoie: The number of parameters originally available in the circuit.

Note

This quantity does not require the circuit to be built yet.

num_qubits¶

Type renvoyé: int

op_start_times¶

Return a list of operation start times.

This attribute is enabled once one of scheduling analysis passes runs on the quantum circuit.

Type renvoyé: List[int]
Renvoie: List of integers representing instruction start times. The index corresponds to the index of instruction in QuantumCircuit.data.
Lève: AttributeError – When circuit is not scheduled.

operators¶

The operators that are evolved in this circuit.

Renvoie: The operators to be evolved (and circuits) contained in this ansatz.
Type renvoyé: list

ordered_parameters¶

The parameters used in the underlying circuit.

This includes float values and duplicates.

Exemples

>>> # prepare circuit ...
>>> print(nlocal)
     ┌───────┐┌──────────┐┌──────────┐┌──────────┐
q_0: ┤ Ry(1) ├┤ Ry(θ[1]) ├┤ Ry(θ[1]) ├┤ Ry(θ[3]) ├
     └───────┘└──────────┘└──────────┘└──────────┘
>>> nlocal.parameters
{Parameter(θ[1]), Parameter(θ[3])}
>>> nlocal.ordered_parameters
[1, Parameter(θ[1]), Parameter(θ[1]), Parameter(θ[3])]

Type renvoyé: List[Parameter]
Renvoie: The parameters objects used in the circuit.

parameter_bounds¶

The parameter bounds for the unbound parameters in the circuit.

Type renvoyé: Optional[List[Tuple[float, float]]]
Renvoie: 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.

parameters¶

Type renvoyé: ParameterView

preferred_init_points¶: Getter of preferred initial points based on the given initial state.

prefix = 'circuit'¶

qregs¶: A list of the quantum registers associated with the circuit.

qubits¶

Returns a list of quantum bits in the order that the registers were added.

Type renvoyé: List[Qubit]

reps¶

The number of times rotation and entanglement block are repeated.

Type renvoyé: int
Renvoie: The number of repetitions.

rotation_blocks¶

The blocks in the rotation layers.

Type renvoyé: List[Instruction]
Renvoie: The blocks in the rotation layers.