DCXGate#

class qiskit.circuit.library.DCXGate[source]#

Bases : Gate

Double-CNOT gate.

A 2-qubit Clifford gate consisting of two back-to-back CNOTs with alternate controls.

Can be applied to a QuantumCircuit with the dcx() method.

          ┌───┐
q_0: ──■─── X ├
     ┌─┮─┐└─┬─┘
q_1: ─ X ├──■──
     └───┘

This is a classical logic gate, equivalent to a CNOT-SWAP (CNS) sequence, and locally equivalent to an iSWAP.

\[\begin{split}DCX\ q_0, q_1 = \begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & 0 & 0 & 1 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \end{pmatrix}\end{split}\]

Create new DCX gate.

Attributes

condition_bits#

Get Clbits in condition.

decompositions#

Get the decompositions of the instruction from the SessionEquivalenceLibrary.

definition#

Return definition in terms of other basic gates.

duration#

Get the duration.

label#

Return instruction label

name#

Return the name.

num_clbits#

Return the number of clbits.

num_qubits#

Return the number of qubits.

params#

return instruction params.

unit#

Get the time unit of duration.