# Ngce.m

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Numerical generalised cumulant expansion route to the relaxation superoperator to second order, which is equivalent to Redfield theory.

## Contents

## Syntax

R=ngce(H,dt)

## Arguments

H - a cell array of spin Hamiltonian commutation superoperators obtained from an MD trajectory

dt - time step of the MD trajectory, seconds

## Outputs

R - laboratory frame relaxation superoperator

## Notes

The trajectory must be at least five times longer than the longest correlation time expected in the system.

## See also

relaxation.m, lindbladian.m, magpump.m

*Version 2.2, authors: Ilya Kuprov*