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Interface quantique atomes-champ en régime de variables continues

Abstract : This work is devoted to the study of the coupling between the electromagnetic field and the collective spin of an atomic ensemble, from a quantum point of view.
We have generated squeezed states of the light by non-linear interaction with cold cesium atoms inside a cavity, behaving as a Kerr medium.
Using Electromagnetically Induced Transparency (EIT) in a Cs vapour, we have then demonstrated experimentaly that the quantum state of a light beam can be mapped into the long lived Zeeman coherences of an atomic ground state. Two non-commuting variables carried by light are simultaneously stored and subsequentely read-out, with no noise added. We have compared the case where a tunable single sideband is stored independently of the other one to the case where the two symmetrical sidebands are stored using the same EIT transparency window.
Finally, two protocols are proposed to generate directely spin squeezing and light entaglement via non linearities arising near the CPT situations or by Raman-based quantum non-demolition measurements of an atomic-alignement.
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https://tel.archives-ouvertes.fr/tel-00315360
Contributor : Jean Cviklinski <>
Submitted on : Thursday, August 28, 2008 - 11:37:09 AM
Last modification on : Thursday, December 10, 2020 - 12:39:04 PM
Long-term archiving on: : Friday, October 5, 2012 - 11:54:29 AM

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  • HAL Id : tel-00315360, version 1

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Jean Cviklinski. Interface quantique atomes-champ en régime de variables continues. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00315360⟩

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