quantax.operator.sigma_x

quantax.operator.sigma_x(*index) → Operator

\(\sigma^x\) operator for spin and fermion systems.

For spin systems,

\[\begin{split}\sigma^x = \begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}\end{split}\]

Parameters:

index – Site to act on, as a flat index or lattice coordinates; see the module docstring for the convention.