Module: pennylane

class X(wires)[source]

The position quadrature observable \(\hat{x}\).

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


  • Number of wires: 1

  • Number of parameters: 0

  • Observable order: 1st order in the quadrature operators

  • Heisenberg representation:

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