Reconstruction of non-classical cavity field states with snapshots of their decoherence

Samuel Deléglise, Igor Dotsenko, Clément Sayrin, Julien Bernu, Michel Brune, Jean-Michel Raimond and Serge Haroche ()
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Samuel Deléglise: Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France
Igor Dotsenko: Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France
Clément Sayrin: Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France
Julien Bernu: Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France
Michel Brune: Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France
Jean-Michel Raimond: Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France
Serge Haroche: Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France

Nature, 2008, vol. 455, issue 7212, 510-514

Abstract: Quantum flicks The state of a microscopic system encodes its complete quantum description. Reconstructing the state of a set of trapped particles shielded from their environment is an important step for the investigation of the quantum–classical boundary. It is challenging to perform state reconstructions of trapped photons because cavities that can store light for very long times are required. Deléglise et al. report the complete reconstruction and pictorial representation of a variety of radiation states trapped in a cavity in which several photons survive long enough to be repeatedly measured. Some of the states show oscillations that are erased by decoherence. The paper shows movies of this process by reconstructing snapshots of quantum states at successive times. The reconstruction procedure is a useful tool for decoherence and quantum feedback studies of fields trapped in one or two cavities.

Date: 2008
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DOI: 10.1038/nature07288

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