# P¶

Module: pennylane

class P(wires)[source]

The momentum quadrature observable $$\hat{p}$$.

When used with the expval() function, the momentum expectation value $$\braket{\hat{p}}$$ is returned. This corresponds to the mean displacement in the phase space along the $$p$$ axis.

Details:

• Number of wires: 1

• Number of parameters: 0

• Observable order: 1st order in the quadrature operators

• Heisenberg representation:

$d = [0, 0, 1]$
Parameters: wires (Sequence[int] or int) – the wire the operation acts on