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Proceedings Paper

Photocount measurements as a tool for investigation of non-classical properties of twin beams
Author(s): Jan Peřina; Ondřej Haderka; Jaromír Křepelka; Martin Hamar; Václav Michálek; Maria Bondani; Alessia Allevi; Alessandra Andreoni
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Paper Abstract

Joint signal-idler photoelectron distributions of twin beams have been measured recently in two distinct regimes: either the mean number of photon pairs per one pump pulse is lower that the number of independent modes or vice versa. Exploiting a microscopic quantum theory for joint quasi-distributions in parametric down-conversion based on the model of superposition of signal and noise we characterize properties of twin beams in terms of quasidistributions using experimental data. In parallel to the microscopic model, joint signal-idler photon-number distribution is reconstructed using the method of maximum likelihood. Negative values as well as oscillating behavior in quantum region are characteristic for the joint signal-idler quasi-distributions of integrated intensities. The larger the mean number of photon pairs per mode the weaker the quantum features are. However, they survive even in the mesoscopic regime, i.e. when tens of photon pairs per mode are present on average. Also the conditional and difference photon-number distributions are shown to be sub-Poissonian and sub-shot-noise, respectively. Violation of classical inequalities for photon-number distributions is discussed.

Paper Details

Date Published: 20 November 2008
PDF: 6 pages
Proc. SPIE 7141, 16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 714104 (20 November 2008); doi: 10.1117/12.822349
Show Author Affiliations
Jan Peřina, Palacký Univ. (Czech Republic)
Ondřej Haderka, Palacký Univ. (Czech Republic)
Jaromír Křepelka, Palacký Univ. (Czech Republic)
Martin Hamar, Palacký Univ. (Czech Republic)
Václav Michálek, Palacký Univ. (Czech Republic)
Maria Bondani, National Lab. for Ultrafast and Ultraintense Optical Science, CNR-INFM (Italy)
Alessia Allevi, Univ. of Insubria, CNR-INFM (Italy)
Alessandra Andreoni, Univ. of Insubria, CNR-INFM (Italy)


Published in SPIE Proceedings Vol. 7141:
16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics
Agnieszka Popiolek-Masajada; Elzbieta Jankowska; Waclaw Urbanczyk, Editor(s)

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