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Phys Rev Lett. 2005 Jan 14;94(1):010401. Epub 2005 Jan 3.

Rabi oscillations revival induced by time reversal: a test of mesoscopic quantum coherence.

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  • 1Laboratoire Kastler Brossel, DĂ©partement de Physique de l'Ecole Normale SupĂ©rieure, 24 rue Lhomond, F-75231 Paris Cedex 05, France.


Using an echo technique proposed by Morigi et al., we have time-reversed the atom-field interaction in a cavity quantum electrodynamics experiment. The collapse of the atomic Rabi oscillation in a coherent field is reversed, resulting in an induced revival signal. The amplitude of this "echo" is sensitive to nonunitary decoherence processes. Its observation demonstrates the existence of a mesoscopic quantum superposition of field states in the cavity between the collapse and the revival times.

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