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Nonlinear Optics

Photon Statistics Analysis of Entangled Photon Pairs via Biexciton Resonant Hyper-Parametric Scattering

Yasufumi YAMAMOTO, Goro Oohata, K. Mizoguchi

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We have investigated the quantum statistics of entangled photon pairs generated from biexcitons in CuCl single crystals via resonant hyper-parametric scattering. The generation of multi-photon pairs has been first observed under the high excitation power.
DOI
10.1364/nlo.2013.nw1a.6

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We have investigated the polarization entanglement between photon pairs generated from a biexciton in a CuCl single crystal via resonant hyperparametric scattering. The pulses of a high repetition pump are seen to provide improved statistical accuracy and the ability to test Bell's inequality. Our results clearly violate the inequality and thus manifest the quantum entanglement and nonlocality of the photon pairs. We also analyzed the quantum state of our photon pairs using quantum state tomography.
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We have constructed a theoretical framework of biexciton-resonant hyperparametric scattering for pursuit of high-power and high-quality generation of entangled-photon pairs. Our framework is applicable to the nano-to-bulk crossover regime where the center-of-mass motions of excitons and biexcitons are confined and material surroundings and the polarization correlation of generated photons can be considered. We have analyzed the generation of ultraviolet entangled photons from CuCl film with and without dielectric microcavity and revealed that in the nano-to-bulk crossover regime we generally get a high performance from the viewpoint of statistical accuracy and the generation efficiency can be enhanced by the optical cavity while maintaining the high performance. The nano-to-bulk crossover regime has a variety of degrees of freedom to control the entangled-photon generation, and the scattering spectra explicitly reflect quantized exciton-photon coupled modes in finite structures.