Low-noise macroscopic twin beams

Timur Sh. Iskhakov, Vladyslav C. Usenko, Radim Filip, Maria V. Chekhova, and Gerd Leuchs
Phys. Rev. A 93, 043849 – Published 26 April 2016

Abstract

Applying a multiphoton-subtraction technique to the two-color macroscopic squeezed vacuum state of light generated via high-gain parametric down-conversion we conditionally prepare a different state of light: bright multimode low-noise twin beams. A lower noise in the sum of the photon numbers opens a possibility to encode information into this variable while keeping the nonclassical character of the state. The obtained results demonstrate up to eightfold suppression of noise in each beam while preserving and even moderately improving the nonclassical photon-number correlations between the beams. The prepared low-noise macroscopic state, containing up to 2000 photons per mode, is not among the Gaussian states achievable through nonlinear optical processes. Apart from that, we suggest a method for measuring quantum efficiency, which is based on the Fano factor measurement. The proposed technique substantially improves the usefulness of twin beams for quantum communication and metrology.

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  • Received 27 August 2014
  • Revised 5 May 2015

DOI:https://doi.org/10.1103/PhysRevA.93.043849

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Timur Sh. Iskhakov1,*, Vladyslav C. Usenko2,3, Radim Filip2, Maria V. Chekhova1,4,5, and Gerd Leuchs1,5

  • 1Max Planck Institute for the Science of Light, Günther-Scharowsky-Strasse 1/Bau 24, 91058 Erlangen, Germany
  • 2Department of Optics, Palacký University, 17, Listopadu 50, 772 00 Olomouc, Czech Republic
  • 3Bogolyubov Institute for Theoretical Physics, Metrolohichna Street 14-b, 03680 Kiev, Ukraine
  • 4Department of Physics, M. V. Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
  • 5University of Erlangen-Nürnberg, Staudtstrasse 7/B2, 91058 Erlangen, Germany

  • *Present address: Technical University of Denmark, Department of Physics, Fysikvej 309, 2800 Kgs. Lyngby, Denmark; tiskha@gmail.com

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Issue

Vol. 93, Iss. 4 — April 2016

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