SwapGate

class qiskit.circuit.library.SwapGate(label=None)

Bases: Gate

The SWAP gate.

This is a symmetric and Clifford gate.

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

Circuit symbol:

q_0: ─X─
      │
q_1: ─X─

Matrix Representation:

\begin{split}SWAP = \begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 0 & 1 \end{pmatrix}\end{split}

The gate is equivalent to a state swap and is a classical logic gate.

|a, b\rangle \rightarrow |b, a\rangle

Create new SWAP gate.

Attributes

Get Clbits in condition.

Get the decompositions of the instruction from the SessionEquivalenceLibrary.

Return definition in terms of other basic gates.

Get the duration.

Return instruction label

Return the name.

Return the number of clbits.

Return the number of qubits.

return instruction params.

Get the time unit of duration.

control(num_ctrl_qubits=1, label=None, ctrl_state=None)

Return a (multi-)controlled-SWAP gate.

One control returns a CSWAP (Fredkin) gate.

Parameters

num_ctrl_qubits (int) – number of control qubits.
label (str or None) – An optional label for the gate [Default: None]
ctrl_state (int orstr or None) – control state expressed as integer, string (e.g. ‘110’), or None. If None, use all 1s.

Returns

controlled version of this gate.

Return type

ControlledGate

inverse()

Return inverse Swap gate (itself).

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