Non-conditioned generation of Schroedinger cat states in a cavity

Details Non-conditioned generation of Schroedinger cat states in a cavity Non-conditioned generation of Schroedinger cat states in a cavity

2004-06-21

arxiv.org/abs/quant-ph/0406152v3

J. Mod. Opt. 52(11), 1557 (2005)

Physics

Quantum Physics

REVTeX4, 8 pages, 7 figures, link to an external animation file

Scientific paper

10.1080/09500340500058116

We investigate the dynamics of a two-level atom in a cavity filled with a nonlinear medium. We show that the atom-field detuning $\delta$ and the nonlinear parameter $\chi^{(3)}$ may be combined to yield a periodic dynamics and allowing the generation of almost exact superpositions of coherent states ({\sl Schr\"odinger} cats). By analysing the atomic inversion and the field purity, we verify that any initial atom-field state is recovered at each revival time, and that a coherent field interacting with an excited atom evolves to a superposition of coherent states at each collapse time. We show that a mixed field state (statistical mixture of two coherent states) evolves towards a pure field state ({\sl Schr\"odinger} cat) as well. We discuss the validity of those results by using the field fidelity and the {\sl Wigner} function.

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