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Frontiers in Optics

Generation of polarization entangled photons from type-II domain engineered PPLN waveguides

Krishnan Thyagarajan, Kanu Sinha, Jasleen Lugani, Sankalpa Ghosh, Olivier Alibart, Daniel B. Ostrowsky, Sébastien Tanzilli

Published Jan 1, 2009• 0 citations
Publisher

Abstract

We propose a new scheme of domain engineering in Lithium Niobate for generating non degenerate polarization entangled photon pairs by simultaneously satisfying the conditions for two different SPDC processes.
DOI
10.1364/fio.2009.fwj2

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We develop and demonstrate a source of polarization-entangled photon pairs using spontaneous parametric down-conversion (SPDC) in domain-engineered, periodically poled lithium niobate (PPLN) at telecom wavelengths. Pumped at 775 nm, this domain-engineered type-II SPDC source produces non-degenerate signal and idler pairs at 1530 nm and 1569 nm. Because of birefringence, the photon pair with horizontally polarized signal and vertically polarized idler has a different phasematching condition than the pair with vertically polarized signal and horizontally polarized idler. Using phase-modulation of the domain structure, we produced a crystal that can simultaneously generate both states in a distributed fashion throughout a single crystal. Performing SPDC using this aperiodically poled crystal, we observed polarization entanglement visibility above 93%. We compare the phase-modulated crystal to other aperiodic structures, including dual-periodically-poled and interlaced biperiodic structures.