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Atomes de Rydberg et cavités : observation de la décohérence dans une mesure quantique

Abstract : We present the observation of the decoherence phenomenon, observed on a simple system, modelling an ideal quantum measurement. The experiment is based on the interaction of a circular Rydberg atom with a microwave field that contains a few photons stored in a superconducting cavity. It creates a quantum superposition involving field states with macroscopically distinct phases. The coherence of the state is tested by a second atom. We observe the transformation of an initially coherent superposition into a statistical mixture. This work represents an experimental contribution to the fundamental issue of the nonexistence of quantum superpositions at a macroscopic scale. Our results are in very good agreement with theory and support the interpretation of decoherence as being the result of the coupling between a system and its environment.
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Submitted on : Tuesday, March 7, 2006 - 1:23:28 PM
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  • HAL Id : tel-00011785, version 1


Jochen Dreyer. Atomes de Rydberg et cavités : observation de la décohérence dans une mesure quantique. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1997. Français. ⟨tel-00011785⟩



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