EvolvedOperatorAnsatz¶

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

Bases: qiskit.circuit.library.n_local.n_local.NLocal

The evolved operator ansatz.

Parameters

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.

Return type: List[AncillaQubit]

calibrations¶

Return calibration dictionary.

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

Return type: dict

clbits¶

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

Return type: List[Clbit]

data¶

entanglement¶

Get the entanglement strategy.

Return type: 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]]]]
Returns: The entanglement strategy, see get_entangler_map() for more detail on how the format is interpreted.

entanglement_blocks¶

The blocks in the entanglement layers.

Return type: List[Instruction]
Returns: The blocks in the entanglement layers.

evolution¶

The evolution converter used to compute the evolution.

Returns: The evolution converter used to compute the evolution.
Return type: EvolutionBase

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

global_phase¶

Return the global phase of the circuit in radians.

Return type: Union[ParameterExpression, float]

header = 'OPENQASM 2.0;'¶

initial_state¶

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

Return type: QuantumCircuit
Returns: The initial state.

insert_barriers¶

If barriers are inserted in between the layers or not.

Return type: bool
Returns: True, if barriers are inserted in between the layers, False if not.

instances = 2308¶

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.

Return type: dict

num_ancillas¶

Return the number of ancilla qubits.

Return type: int

num_clbits¶

Return number of classical bits.

Return type: int

num_layers¶

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

Return type: int
Returns: The number of layers in the circuit.

num_parameters¶

Return type: 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.

Return type: int
Returns: The number of parameters originally available in the circuit.

Note

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

num_qubits¶

Return type: 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.

Return type: List[int]
Returns: List of integers representing instruction start times. The index corresponds to the index of instruction in QuantumCircuit.data.
Raises: AttributeError – When circuit is not scheduled.

operators¶

The operators that are evolved in this circuit.

Returns: The operators to be evolved (and circuits) contained in this ansatz.
Return type: list

ordered_parameters¶

The parameters used in the underlying circuit.

This includes float values and duplicates.

Examples

>>> # 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])]

Return type: List[Parameter]
Returns: The parameters objects used in the circuit.

parameter_bounds¶

The parameter bounds for the unbound parameters in the circuit.

Return type: Optional[List[Tuple[float, float]]]
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.

parameters¶

Return type: 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.

Return type: List[Qubit]

reps¶

The number of times rotation and entanglement block are repeated.

Return type: int
Returns: The number of repetitions.

rotation_blocks¶

The blocks in the rotation layers.

Return type: List[Instruction]
Returns: The blocks in the rotation layers.