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Oscillations de Rabi induites par un renversement du temps : un test de la cohérence d'une superposition quantique mésoscopique

Abstract : Cavity quantum electrodynamic studies an atom in interaction with a mode of the field. In resonance with a coherent mesoscopic field (quantum Rabi oscillation), the atom modifies deeply the field. It becomes entangled with two states with the same amplitude, but with different phases, creating a quantum mesoscopic superposition and implying collapse and revival of Rabi oscillation.
We present an experimental investigation of the intrication using circular Rydberg atoms and a superconducting micro-wave cavity. To know the field, we have developed a measure of the Q-function, applied to different states: one photon Fock state and coherent states. We have measured the distance between the two components created by Rabi oscillation. Unlike revival of Rabi oscillation, this measurement does not prove anything about coherence. We thus induced revival by a transformation of the state of the atom, similar to time reversal transformation, and obtained a proof of the creation of mesoscopic quantum superposition.
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Contributor : Tristan Meunier <>
Submitted on : Monday, January 9, 2006 - 6:16:29 PM
Last modification on : Wednesday, December 23, 2020 - 11:28:06 AM
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  • HAL Id : tel-00011329, version 1

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Tristan Meunier. Oscillations de Rabi induites par un renversement du temps : un test de la cohérence d'une superposition quantique mésoscopique. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00011329⟩

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