quantax.operator.sigma_z

quantax.operator.sigma_z(*index) → Operator

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

For spin systems,

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

Parameters:

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