On the quantum (in)stability in cavity QED

Details On the quantum (in)stability in cavity QED On the quantum (in)stability in cavity QED

2005-04-25

arxiv.org/abs/quant-ph/0504180v1

S.V. Prants and M.Yu. Uleysky. Quantum stability in cavity QED. JETP Letters. V.82 N12 748-752 (2005) [Pis'ma ZETP. V.82. Is.1

Physics

Quantum Physics

Scientific paper

10.1134/1.2175242

The stability and instability of quantum motion is studied in the context of cavity quantum electrodynamics (QED). It is shown that the Jaynes-Cummings dynamics can be unstable in the regime of chaotic walking of an atom in the quantized field of a standing wave in the absence of any other interaction with environment. This quantum instability manifests itself in strong variations of quantum purity and entropy and in exponential sensitivity of fidelity of quantum states to small variations in the atom-field detuning. It is quantified in terms of the respective classical maximal Lyapunov exponent that can be estimated in appropriate in-out experiments.

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