# qiskit.circuit.EquivalenceLibrary¶

class EquivalenceLibrary(*, base=None)[ソース]

A library providing a one-way mapping of Gates to their equivalent implementations as QuantumCircuits.

Create a new equivalence library.

パラメータ

base (Optional[EquivalenceLibrary]) – Base equivalence library to will be referenced if an entry is not found in this library.

__init__(*, base=None)[ソース]

Create a new equivalence library.

パラメータ

base (Optional[EquivalenceLibrary]) – Base equivalence library to will be referenced if an entry is not found in this library.

Methods

 __init__(*[, base]) Create a new equivalence library. add_equivalence(gate, equivalent_circuit) Add a new equivalence to the library. draw([filename]) Draws the equivalence relations available in the library. get_entry(gate) Gets the set of QuantumCircuits circuits from the library which equivalently implement the given Gate. has_entry(gate) Check if a library contains any decompositions for gate. set_entry(gate, entry) Set the equivalence record for a Gate.
add_equivalence(gate, equivalent_circuit)[ソース]

Add a new equivalence to the library. Future queries for the Gate will include the given circuit, in addition to all existing equivalences (including those from base).

Parameterized Gates (those including qiskit.circuit.Parameters in their Gate.params) can be marked equivalent to parameterized circuits, provided the parameters match.

パラメータ
• gate (Gate) – A Gate instance.

• equivalent_circuit (QuantumCircuit) – A circuit equivalently implementing the given Gate.

draw(filename=None)[ソース]

Draws the equivalence relations available in the library.

パラメータ

filename (str) – An optional path to write the output image to if specified this method will return None.

Drawn equivalence library as an

IPython SVG if in a jupyter notebook, or as a PIL.Image otherwise.

PIL.Image or IPython.display.SVG

ImportError – when pydot or pillow are not installed.

get_entry(gate)[ソース]

Gets the set of QuantumCircuits circuits from the library which equivalently implement the given Gate.

Parameterized circuits will have their parameters replaced with the corresponding entries from Gate.params.

パラメータ

gate (Gate) – A Gate instance.

A list of equivalent QuantumCircuits. If empty,

library contains no known decompositions of Gate.

Returned circuits will be ordered according to their insertion in the library, from earliest to latest, from top to base. The ordering of the StandardEquivalenceLibrary will not generally be consistent across Qiskit versions.

List[QuantumCircuit]

has_entry(gate)[ソース]

Check if a library contains any decompositions for gate.

パラメータ

gate (Gate) – A Gate instance.

True if gate has a known decomposition in the library.

False otherwise.

Bool

set_entry(gate, entry)[ソース]

Set the equivalence record for a Gate. Future queries for the Gate will return only the circuits provided.

Parameterized Gates (those including qiskit.circuit.Parameters in their Gate.params) can be marked equivalent to parameterized circuits, provided the parameters match.

パラメータ
• gate (Gate) – A Gate instance.

• entry (List['QuantumCircuit']) – A list of QuantumCircuits, each equivalently implementing the given Gate.