Long-lived Quantum Coherence between Macroscopically Distinct States in Superradiance

Details Long-lived Quantum Coherence between Macroscopically Distinct States in Superradiance Long-lived Quantum Coherence between Macroscopically Distinct States in Superradiance

1999-03-11

arxiv.org/abs/quant-ph/9903040v1

Opt. Comm. {\bf 179}, 195 (2000)

Physics

Quantum Physics

4 pages of revtex

Scientific paper

10.1016/S0030-4018(99)00480-0

The dephasing influence of a dissipative environment reduces linear superpositions of macroscopically distinct quantum states (sometimes also called Schr\"odinger cat states) usually almost immediately to a statistical mixture. This process is called decoherence. Couplings to the environment with a certain symmetry can lead to slow decoherence. In this Letter we show that the collective coupling of a large number of two-level atoms to an electromagnetic field mode in a cavity that leads to the phenomena of superradiance has such a symmetry, at least approximately. We construct superpositions of macroscopically distinct quantum states decohering only on a classical time scale and propose an experiment in which the extraordinarily slow decoherence should be observable.

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