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Theses

Transparence induite électromagnétiquement et mémoire quantique dans une vapeur de césium

Abstract : This thesis is devoted to the physical implementation of a quantum memory using electromagnetically induced transparency (EIT) in cesium vapor as well as a source of squeezed vacuum at 852 nm.
A light-matter interface based on EIT has been implemented and its performance characterized by the storage and retrieval of coherent states. The process is coherent and has no excess noise. The performance of the system has been assessed in terms of fidelity and also using the T-V diagram.
The EIT process using the D2 line of a cesium vapor has been studied, both theoretically and experimentally, and has shown the combined effect of the hyperfine structure and the Doppler broadening on the effective transparency of the medium.
In order to store non-classical states of light in the memory, a squeezed vacuum source at 852 nm has been implemented and the output characteristics analyzed by quantum tomography. The source is based on an optical parametric oscillator operated below threshold.
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https://tel.archives-ouvertes.fr/tel-00424144
Contributor : Jérémie Ortalo <>
Submitted on : Wednesday, October 14, 2009 - 11:43:14 AM
Last modification on : Thursday, December 10, 2020 - 12:37:16 PM
Long-term archiving on: : Wednesday, June 16, 2010 - 12:44:37 AM

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  • HAL Id : tel-00424144, version 1

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Jérémie Ortalo. Transparence induite électromagnétiquement et mémoire quantique dans une vapeur de césium. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00424144⟩

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