SwapGate

class SwapGate(label=None)

Bases: qiskit.circuit.gate.Gate

The SWAP gate.

This is a symmetric and Clifford gate.

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.

Methods Defined Here

SwapGate.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 or str 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

SwapGate.inverse()

Return inverse Swap gate (itself).

Get the decompositions of the instruction from the SessionEquivalenceLibrary.

Return definition in terms of other basic gates.

Get the duration.

Return instruction label

Return type

str

return instruction params.

Get the time unit of duration.

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