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Proceedings Paper

The orbital angular momentum spectrum of photons generated via parametric down-conversion
Author(s): Clara I. Osorio; Gabriel Molina-Terriza; Juan P. Torres
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Paper Abstract

The generation of paired photons entangled in orbital angular momentum (OAM), provides a new degree of freedom that is increasingly being used as a source of quantum states. Elucidation of the OAM spectrum of OAM spectrum of the generated photons is of paramount importance, since quantum information applications require the ability to generate arbitrary entangled states with the appropriate OAM correlations. Here we discuss the OAM spectrum of the photon generated via SPDC in two complementary scenarios. On one hand, we should consider the whole geometry of the nonlinear process, taking into account azimuthal variations of the nonlinear coefficient or the phase matching conditions. On the other hand, all relevant experiments reported to date detect only a small section of the full down-conversion cone. In this scenario, the measured OAM correlations depend of the emission angle of the photons and the strength of the Poynting vector walk-off. We will present experiments in SPDC where this dependence is clearly revealed.

Paper Details

Date Published: 25 September 2007
PDF: 11 pages
Proc. SPIE 6710, Quantum Communications and Quantum Imaging V, 67100D (25 September 2007); doi: 10.1117/12.734066
Show Author Affiliations
Clara I. Osorio, ICFO-Institut de Ciencies Fotoniques (Spain)
Gabriel Molina-Terriza, ICFO-Institut de Ciencies Fotoniques (Spain)
ICREA-Institucio Catalana de Recerca I Estudis Avancats (Spain)
Juan P. Torres, ICFO-Institut de Ciencies Fotoniques (Spain)
Univ. Politecnica de Catalunya (Spain)

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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