# p_superop.m

From Spinach Documentation Wiki

Sided product superoperator in the spherical tensor basis set. Returns superoperators corresponding to right or left multiplication of a density matrix by a user-specified operator.

## Syntax

A=p_superop(spin_system,opspec,side)

## Arguments

opspec - Spinach operator specification described in Sections 2.1 and 3.3 of the following paper: http://dx.doi.org/10.1016/j.jmr.2010.11.008 side - 'left' or 'right' causes the function to return a product superoperator corresponding to a product from that side; 'comm' or 'acomm' results in commutation and anticommuta- tion superoperator respectively.

## Outputs

A - a three-column array of row indices (first column), column indices (second column) and values (third column).

## Notes

- This is a very general function to which direct calls are not usually required - please use the much friendlier operator.m function.
- The superoperator is returned in XYZ sparse format, which is different from Matlab's CSC format.

## See also

operator.m, state.m, unit_oper.m, mprealloc.m, hamiltonian.m, relaxation.m, kinetics.m

*Version 2.4, authors: Ilya Kuprov, Hannah Hogben*.