This program implements the BerryIter algorithm in ref to compute the evolution of a 2 state quantum system under a time-dependent Hamiltonian.

Ref:Quantum phase corrections from adiabatic iteration. (1987). Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 414(1846), 31–46. https://doi.org/10.1098/rspa.1987.0131