Extra phase noise from thermal fluctuations in nonlinear optical crystals

J. E. S. César, A. S. Coelho, K. N. Cassemiro, A. S. Villar, M. Lassen, P. Nussenzveig, and M. Martinelli
Phys. Rev. A 79, 063816 – Published 11 June 2009

Abstract

We show theoretically and experimentally that scattered light by thermal phonons inside a second-order nonlinear crystal is the source of additional phase noise observed in optical parametric oscillators. This additional phase noise reduces the quantum correlations and has hitherto hindered the direct production of multipartite entanglement in a single nonlinear optical system. We cooled the nonlinear crystal and observed a reduction in the extra noise. Our treatment of this noise can be successfully applied to different systems in the literature.

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  • Received 25 March 2009

DOI:https://doi.org/10.1103/PhysRevA.79.063816

©2009 American Physical Society

Authors & Affiliations

J. E. S. César1, A. S. Coelho1, K. N. Cassemiro2, A. S. Villar3, M. Lassen4, P. Nussenzveig1, and M. Martinelli1

  • 1Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, 05315-970 São Paulo, SP, Brazil
  • 2Max Planck Junior Research Group, Günther Scharowskystr. 1/Bau 24, 91058 Erlangen, Germany
  • 3Max Planck Institute for the Science of Light, University of Erlangen-Nuremberg, Staudtstr. 7/B2, 91058 Erlangen, Germany
  • 4Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kgs. Lyngby, Denmark

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Issue

Vol. 79, Iss. 6 — June 2009

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