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Theses

Génération et caractérisation d'états intriqués en variables continues

Abstract : This thesis studies, both theoretically and experimentally, quantum correlations in the continuous variables regime.
The problem of characterizing these correlations is widely approached, especially for Gaussian states. The formalism of covariance matrices is developed, for it is particularly well adapted to this study. The different existing criteria are listed.
The main experimental device of this thesis is a self-phase-locked Optical Parametric Oscillator. The criteria enable to characterize the entanglement amount of the beams it generates. Below threshold, the empty beams present a separability of 0.33 and the system apparently violates the Heisenberg inequality by 58%. Above threshold, the obtained bright beams are also strongly non classical: the separability is 0.6 and the Heisenberg inequality is apparently violated by 24%.
An original application of this device is proposed: it is theoretically shown that a self-phase-locked two-crystal OPO produces two polarization entangled beams, which should make easier light-matter entanglement transfer.
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https://tel.archives-ouvertes.fr/tel-00265679
Contributor : Gaëlle Keller <>
Submitted on : Wednesday, March 26, 2008 - 8:29:32 AM
Last modification on : Thursday, December 10, 2020 - 12:36:31 PM
Long-term archiving on: : Tuesday, September 21, 2010 - 3:46:41 PM

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  • HAL Id : tel-00265679, version 2

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Gaëlle Keller. Génération et caractérisation d'états intriqués en variables continues. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00265679v2⟩

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