Double-Λ microscopic model for entangled light generation by four-wave mixing

Q. Glorieux, R. Dubessy, S. Guibal, L. Guidoni, J.-P. Likforman, T. Coudreau, and E. Arimondo
Phys. Rev. A 82, 033819 – Published 17 September 2010

Abstract

Motivated by recent experiments, we study four-wave-mixing in an atomic double-Λ system driven by a far-detuned pump. Using the Heisenberg-Langevin formalism, and based on the microscopic properties of the medium, we calculate the classical and quantum properties of seed and conjugate beams beyond the linear amplifier approximation. A continuous-variable approach gives us access to relative-intensity noise spectra that can be directly compared with experiments. Restricting ourselves to the cold-atom regime, we predict the generation of quantum-correlated beams with a relative-intensity noise spectrum well below the standard quantum limit (down to 6 dB). Moreover, entanglement between seed and conjugate beams measured by an inseparability down to 0.25 is expected. This work opens the way to the generation of entangled beams by four-wave mixing in a cold-atom sample.

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  • Received 9 July 2010

DOI:https://doi.org/10.1103/PhysRevA.82.033819

©2010 American Physical Society

Authors & Affiliations

Q. Glorieux*, R. Dubessy, S. Guibal, L. Guidoni, J.-P. Likforman, and T. Coudreau

  • Laboratoire Matériaux et Phénomènes Quantiques, Unité Mixte de Recherche 7162, Université Paris-Diderot CNRS 10, rue A. Domon et L. Duquet, FR-75013 Paris, France

E. Arimondo

  • Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche, Dipartimento di Fisica E. Fermi, Università di Pisa, Largo Pontecorvo 3, IT-56127 Pisa, Italy

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

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Issue

Vol. 82, Iss. 3 — September 2010

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