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

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...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2011-11, Vol.84 (5), Article 053826
Main Authors: Glorieux, Quentin, Guidoni, Luca, Guibal, Samuel, Likforman, Jean-Pierre, Coudreau, Thomas
Format: Article
Language:English
Subjects:
AMPLIFICATION
ATOMIC AND MOLECULAR PHYSICS
ATOMS
BEAM SPLITTING
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CORRELATIONS
EIGENSTATES
FREQUENCY MIXING
PHOTONS
QUANTUM MECHANICS
RUBIDIUM
VAPORS
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Summary: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.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.84.053826