Quantum correlations by four-wave mixing in an atomic vapor in a nonamplifying regime: Quantum beam splitter for photons

Quentin Glorieux, Luca Guidoni, Samuel Guibal, Jean-Pierre Likforman, and Thomas Coudreau
Phys. Rev. A 84, 053826 – Published 14 November 2011

Abstract

We study the generation of intensity quantum correlations using four-wave mixing in a rubidium vapor. The absence of cavities in these experiments allows to deal with several spatial modes simultaneously. In the standard amplifying configuration, we measure relative intensity squeezing up to 9.2 dB below the standard quantum limit. We also theoretically identify and experimentally demonstrate an original regime where, despite no overall amplification, quantum correlations are generated. In this regime, a four-wave mixing setup can play the role of a photonic beam splitter with nonclassical properties, that is, a device that splits a coherent state input into two quantum-correlated beams.

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  • Received 12 May 2011

DOI:https://doi.org/10.1103/PhysRevA.84.053826

©2011 American Physical Society

Authors & Affiliations

Quentin Glorieux*, Luca Guidoni, Samuel Guibal, Jean-Pierre Likforman, and Thomas Coudreau

  • Université Paris Diderot, Sorbonne Paris Cité, Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162 CNRS, F-75205 Paris, France

  • *quentin.glorieux@univ-paris-diderot.fr

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Issue

Vol. 84, Iss. 5 — November 2011

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