Aspects of Two-Level Systems under External Time Dependent Fields

Details Aspects of Two-Level Systems under External Time Dependent Fields Aspects of Two-Level Systems under External Time Dependent Fields

2001-12-03

arxiv.org/abs/quant-ph/0112016v1

J.Phys.A35:175,2002

Physics

Quantum Physics

To appear in J. Phys. A. Mathematical and General

Scientific paper

10.1088/0305-4470/35/1/501

The dynamics of two-level systems in time-dependent backgrounds is under consideration. We present some new exact solutions in special backgrounds decaying in time. On the other hand, following ideas of Feynman, Vernon and Hellwarth, we discuss in detail the possibility to reduce the quantum dynamics to a classical Hamiltonian system. This, in particular, opens the possibility to directly apply powerful methods of classical mechanics (e.g. KAM methods) to study the quantum system. Following such an approach, we draw conclusions of relevance for ``quantum chaos'' when the external background is periodic or quasi-periodic in time.

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