The orbital angular momentum spectrum of photons generated via parametric down-conversion

Clara I. Osorio; Gabriel Molina-Terriza; Juan P. Torres

doi:10.1117/12.734066

25 September 2007 The orbital angular momentum spectrum of photons generated via parametric down-conversion

Clara I. Osorio, Gabriel Molina-Terriza, Juan P. Torres

Proceedings Volume 6710, Quantum Communications and Quantum Imaging V; 67100D (2007) https://doi.org/10.1117/12.734066
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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.

Citation Download Citation

Clara I. Osorio, Gabriel Molina-Terriza, and Juan P. Torres "The orbital angular momentum spectrum of photons generated via parametric down-conversion", Proc. SPIE 6710, Quantum Communications and Quantum Imaging V, 67100D (25 September 2007); https://doi.org/10.1117/12.734066

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KEYWORDS

Photons

Nonlinear crystals

Crystals

Polarization

Wave propagation

Phase matching

Quantum information

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