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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Anisotropically high entanglement of biphotons

Mikhail Vladimirovich Fedorov, S. P. Kulik, Ekaterina V. Moreva, Stanislav S. Straupe, P. A. Volkov, Maxim A. Efremov

Published Jun 1, 2007• 0 citations
Publisher

Abstract

Biphoton states arising in the process of spontaneous parametric down-conversion (SPDC) are entangled with respect to continuous variables, momentum or coordinates. We discuss some novel and unexpected features of biphoton wave packets.
DOI
10.1109/cleoe-iqec.2007.4386905

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We investigate theoretically the strong anisotropy in the wave packet distribution of biphoton pairs generated via spontaneous parametric down-conversion (SPDC) process with biaxial crystals. From the angle relationship in biaxial crystals, we deduce the wave function of type I SPDC by considering the longitudinal detuning under paraxial approximation. Taking BiB3O6 (BIBO) as an example, we numerically simulate the single-particle and coincidence distributions in two observation planes under the optimum phase-matching scheme. In contrast to uniaxial crystals, a stronger anisotropy effect and a higher entanglement of the photon pair states are obtained, which are attributed to the complex structure of biaxial crystals. These results are important for the generation of highly entangled biphoton pairs, especially for multi-photon pairs generation.