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The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Biphoton Generation with an Optimized Wavefront for Free-Space Propagation by means of Adaptive Optics

Mattia Minozzi, Stefano Bonora, Alexander V. Sergienko, Giuseppe Vallone, Paolo Villoresi

Published Jan 1, 2013• 0 citations
Publisher

Abstract

The pump wavefront which generates photon pairs by spontaneous parametric down conversion is optimized using a feedback which optimize the coincidence count after propagation along a suitable path. The active element is a deformable mirror.
DOI
10.1364/qim.2013.w6.03

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We present an efficient method for optimizing the spatial profile of entangled-photon wave function produced in a spontaneous parametric down conversion process. A deformable mirror that modifies a wavefront of a 404 nm CW diode laser pump interacting with a nonlinear β-barium borate type-I crystal effectively controls the profile of the joint biphoton function. The use of a feedback signal extracted from the biphoton coincidence rate is used to achieve the optimal wavefront shape. The optimization of the two-photon coupling into two, single spatial modes for correlated detection is used for a practical demonstration of this physical principle.