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Entanglement of a Mesoscopic Field with an Atom induced by Photon Graininess in a Cavity
Auffeves A., Maioli P., Meunier T., Gleyzes S., Nogues G. et al
http://hal.archives-ouvertes.fr/hal-00000528
Physique/Physique Quantique
Entanglement of a Mesoscopic Field with an Atom induced by Photon Graininess in a Cavity
Alexia Auffeves1, Paolo Maioli1, Tristan Meunier ()1, Sébastien Gleyzes1, Gilles Nogues ()1, Michel Brune1, Jean-Michel Raimond1, Serge Haroche1, 2
1 :  LKB (Lhomond) - Laboratoire Kastler Brossel
http://www.lkb.ens.fr
CNRS : UMR8552 – Université Pierre et Marie Curie (UPMC) - Paris VI – École normale supérieure [ENS] - Paris
24 rue Lhomond, F-75231 Paris CEDEX 05
France
2 :  PCC - Physique Corpusculaire et Cosmologie - Collège de France
CNRS : UMR7553 – IN2P3 – Université Paris VII - Paris Diderot
11, place Marcelin Berthelot - 75231 Paris Cedex 05
France
NPSC
We observe that a mesoscopic field made of several tens of microwave photons exhibits quantum features when interacting with a single Rydberg atom in a high-Q cavity. The field is split into two components whose phases differ by an angle inversely proportional to the square root of the average photon number. The field and the atomic dipole are phase-entangled. These manifestations of photon graininess vanish at the classical limit. This experiment opens the way to studies of large Schrödinger cat states at the quantum-classical boundary.
Anglais

03.65.-w, 03.67.Mn, 42.50.Dv

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