SKRYN: A fast semismooth-Krylov–Newton method for controlling Ising spin systems

Abstract The modeling and control of Ising spin systems is of fundamental importance in NMR spectroscopy applications. In this paper, two computer packages, ReHaG and SKRYN, are presented. Their purpose is to set-up and solve quantum optimal control problems governed by the Liouville master equation modeling Ising spin- 1 2 systems with pointwise control constraints. In particular, the MATLAB package ReHaG allows to compute a real matrix representation of the master equation. The MATLAB package SKRYN ... Title of program: SKRYN, ReHaG Catalogue Id: AEVN_v1_0 Nature of problem Set-up and solution of quantum Ising spin-½ optimal control problems, for NMR spectroscopy applications. Versions of this program held in the CPC repository in Mendeley Data AEVN_v1_0; SKRYN, ReHaG; 10.1016/j.cpc.2015.01.006 AEVN_v1_0; SKRYN, ReHaG; 10.1016/j.cpc.2015.01.006 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)