Mesures QND en electrodynamique quantique en cavite : production et decoherence d'etats de Fock ; effet Zenon quantique

Abstract : We have implemented a Quantum Non Demolition measurement of the photon number of a field stored in a cavity of damping time T=0.13s. We send circular Rydberg atoms in the cavity. A dispersive interaction shifts the atomic frequency linearly in the photon number. This light-shift is detected by atomic Ramsey interferometry. The cavity damping time is long enough to observe the quantum jumps induced by relaxation. By a statistical analysis of the different trajectories, we carry out a partial tomography of this process responsible for the decoherence of the Fock states |n> within a time T/n. The projection of the initially coherent field onto a Fock state during a measurement completely blurs the field phase simultaneously. This back-action can freeze the coherent growth of the field by quantum Zeno effect.
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Julien Bernu. Mesures QND en electrodynamique quantique en cavite : production et decoherence d'etats de Fock ; effet Zenon quantique. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00351299⟩

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