Optimized time-dependent perturbation theory for pulse-driven quantum dynamics in atomic or molecular systems
D. Daems, S. Guérin, H. R. Jauslin, A. Keller, O. Atabek
Abstract
We present a time-dependent perturbative approach adapted to the treatment of intense pulsed interactions. We show there is a freedom in choosing secular terms and use it to optimize the accuracy of the approximation. We apply this formulation to a unitary superconvergent technique and improve the accuracy by several orders of magnitude with respect to the Magnus expansion.
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