Decoherence-induced geometric phase in a multilevel atomic system

Details Decoherence-induced geometric phase in a multilevel atomic system Decoherence-induced geometric phase in a multilevel atomic system

2006-12-24

arxiv.org/abs/quant-ph/0612201v1

J. Phys. B 40, S127 (2007) (special issue on "Dynamical Control of Entanglement and Decoherence by Field-Matter Interactions")

Physics

Quantum Physics

9 pages, 12 figures

Scientific paper

We consider the STIRAP process in a three-level atom. Viewed as a closed system, no geometric phase is acquired. But in the presence of spontaneous emission and/or collisional relaxation we show numerically that a non-vanishing, purely real, geometric phase is acquired during STIRAP, whose magnitude grows with the decay rates. Rather than viewing this decoherence-induced geometric phase as a nuisance, it can be considered an example of "beneficial decoherence": the environment provides a mechanism for the generation of geometric phases which would otherwise require an extra experimental control knob.

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