Experimental characterization of the Gaussian state of squeezed light obtained via single-passage through an atomic vapor

We show that the description of light in terms of Stokes operators in combination with the assumption of Gaussian statistics results in a dramatic simplification of the experimental study of fluctuations in the light transmitted through an atomic vapor: no local oscillator is required, the detected...

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Bibliographic Details
Published in:arXiv.org 2015-05
Main Authors: Valente, P, Auyuanet, A, Barreiro, S, Failache, H, Lezama, A
Format: Article
Language:English
Subjects:
Entanglement
Laser beams
Light
Light beams
Operators (mathematics)
Vapors
Variations
Online Access:Get full text
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Summary:We show that the description of light in terms of Stokes operators in combination with the assumption of Gaussian statistics results in a dramatic simplification of the experimental study of fluctuations in the light transmitted through an atomic vapor: no local oscillator is required, the detected quadrature is easily selected by a wave-plate angle and the complete noise ellipsis reconstruction is obtained via matrix diagonalization. We provide empirical support for the assumption of Gaussian statistics in quasi-resonant light transmitted through an \(^{87}\)Rb vapor cell and we illustrate the suggested approach by studying the evolution of the fluctuation ellipsis as a function of laser detuning. Applying the method to two light beams obtained by parting squeezed light in a beamsplitter, we have measured entanglement and quantum discord.
ISSN:2331-8422
DOI:10.48550/arxiv.1504.03904