Generation of polarization-entangled photons using type-II doubly periodically poled lithium niobate waveguides

Krishna Thyagarajan (1, 2) , J. Lugani (2) , S. Ghosh (2) , K. Sinha (3) , Anthony Martin (1) , Daniel Barry Ostrowsky (1) , Olivier Alibart (1) , Sébastien Tanzilli (1)

1 LPMC - Laboratoire de physique de la matière condensée
2 IIT Guwahati - Indian Institute of Technology Guwahati
3 University of Maryland [College Park]

In this paper, we address the issue of the generation of nondegenerate cross-polarization-entangled photon pairs using type-II periodically poled lithium niobate. We show that, by an appropriate engineering of the quasi-phase-matching grating, it is possible to simultaneously satisfy the conditions for two spontaneous parametric down-conversion processes, namely, ordinary pump photon down conversion to either extraordinary signal and ordinary idler paired photons or to ordinary signal and extraordinary idler paired photons. In contrast to single type-II phase matching, these two processes, when enabled together, can lead to the direct production of cross-polarization-entangled states for nondegenerate signal and idler wavelengths. Such a scheme should be of great interest in applications requiring polarization-entangled nondegenerate paired photons with, for instance, one of the entangled photons at an appropriate wavelength being used for local operation or for quantum storage in an atomic ensemble and the other one at the typical wavelength of 1550 nm for propagation through an optical fiber.

Mots clés: Entanglement production and manipulation; Quantum communication; Nonlinear optics; Integrated optics

Domaines: Autre [cond-mat.other]

Krishna Thyagarajan, J. Lugani, S. Ghosh, K. Sinha, Anthony Martin, et al.. Generation of polarization-entangled photons using type-II doubly periodically poled lithium niobate waveguides. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2009, 80 (5), pp.052321.1-052321.8. ⟨hal-00441066⟩