C贸digo fuente para qiskit.circuit.library.standard_gates.dcx

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"""Double-CNOT gate."""

from qiskit.circuit.gate import Gate
from qiskit.circuit.quantumregister import QuantumRegister
from qiskit.circuit._utils import with_gate_array


[documentos]@with_gate_array([[1, 0, 0, 0], [0, 0, 0, 1], [0, 1, 0, 0], [0, 0, 1, 0]]) class DCXGate(Gate): r"""Double-CNOT gate. A 2-qubit Clifford gate consisting of two back-to-back CNOTs with alternate controls. Can be applied to a :class:`~qiskit.circuit.QuantumCircuit` with the :meth:`~qiskit.circuit.QuantumCircuit.dcx` method. .. parsed-literal:: 鈹屸攢鈹鈹鈹 q_0: 鈹鈹鈻犫攢鈹鈹 X 鈹 鈹屸攢鈹粹攢鈹愨敂鈹鈹攢鈹 q_1: 鈹 X 鈹溾攢鈹鈻犫攢鈹 鈹斺攢鈹鈹鈹 This is a classical logic gate, equivalent to a CNOT-SWAP (CNS) sequence, and locally equivalent to an iSWAP. .. math:: DCX\ q_0, q_1 = \begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & 0 & 0 & 1 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \end{pmatrix} """ def __init__(self): """Create new DCX gate.""" super().__init__("dcx", 2, []) def _define(self): """ gate dcx a, b { cx a, b; cx b, a; } """ # pylint: disable=cyclic-import from qiskit.circuit.quantumcircuit import QuantumCircuit from .x import CXGate q = QuantumRegister(2, "q") qc = QuantumCircuit(q, name=self.name) rules = [(CXGate(), [q[0], q[1]], []), (CXGate(), [q[1], q[0]], [])] for instr, qargs, cargs in rules: qc._append(instr, qargs, cargs) self.definition = qc