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Détection non destructive d'un atome unique par interaction dispersive avec un champ mésoscopique dans une cavité

Abstract : The detection of qubit states is an essential element in the realization of a quantum information experiment. In our system, the quantum bit is coded in the internal energy states of a circular Rydberg two-level atom. In this thesis we present a novel technique for the non-demolition state-sensitive detection of Rydberg atoms, based on the dispersive interaction of an atom with a microwave mesoscopic field contained in a high-quality superconducting cavity. The state-dependent atomic index of refraction shifts the field phase, and an homodyne procedure translates the information from the field phase to the intensity. The final field intensity is read out by a mesoscopic atomic sample. This technique is non-destructive, since the detection procedure does not ionize the atom, which is simply projected in the measured internal state. The technique, in addition, entangles the energy state of an atom to the excitation level of a many atoms sample, making it possible to create coherent superpositions of mesoscopic atomic states, which opens new perspectives for decoherence tests. We present the principle of the technique and numerous experimental results, as well as possible schemes of application.
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https://tel.archives-ouvertes.fr/tel-00007691
Contributor : Paolo Maioli <>
Submitted on : Thursday, December 9, 2004 - 9:47:33 AM
Last modification on : Wednesday, December 9, 2020 - 3:13:50 PM
Long-term archiving on: : Friday, April 2, 2010 - 9:45:12 PM

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  • HAL Id : tel-00007691, version 1

Citation

Paolo Maioli. Détection non destructive d'un atome unique par interaction dispersive avec un champ mésoscopique dans une cavité. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00007691⟩

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