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Proceedings Paper

Nonclassical mesoscopic twin-beam of light
Author(s): M. Bondani; A. Allevi; G. Zambra; M. G. A. Paris; A. Andreoni; J. Peřina; J. Křepelka; J. Peřina
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Paper Abstract

We demonstrate, by direct measurement of the number of photons in signal and idler, that the twin-beam of light produced by ps-pulsed spontaneous parametric downconversion is endowed with sub-shot-noise photon-number correlations in a mesoscopic intensity regime (more than 1000 detected photons). The noise reduction, calculated from the variance of the difference in the numbers of detected-photons, resulted to be 3.25 dB below the shot-noise level. From experimental data we can recover joint photon-number distribution and a negative-valued joint signal-idler quasi-distributions of integrated intensities, which demonstrates the nonclassical character of the generated field.

Paper Details

Date Published: 25 September 2007
PDF: 7 pages
Proc. SPIE 6710, Quantum Communications and Quantum Imaging V, 671004 (25 September 2007); doi: 10.1117/12.732466
Show Author Affiliations
M. Bondani, CNR-INFM (Italy)
A. Allevi, CNR-INFM-CNISM, Univ. degli Studi dell'Insubria (Italy)
G. Zambra, Univ. degli Studi dell'Insubria (Italy)
Univ. degli Studi di Milano (Italy)
M. G. A. Paris, Univ. degli Studi di Milano (Italy)
A. Andreoni, CNR-INFM-CNISM, Univ. degli Studi dell'Insubria (Italy)
J. Peřina, Palacký Univ. (Czech Republic)
Joint Lab. of Optics, Palacký Univ. and Institute of Physics (Czech Republic)
J. Křepelka, Joint Lab. of Optics, Palacký Univ. and Institute of Physics (Czech Republic)
J. Peřina, Joint Lab. of Optics, Palacký Univ. and Institute of Physics (Czech Republic)


Published in SPIE Proceedings Vol. 6710:
Quantum Communications and Quantum Imaging V
Ronald E. Meyers; Yanhua Shih; Keith S. Deacon, Editor(s)

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