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Generation of Counterpropagating Path-Entangled Photon Pairs in a Single Periodic Waveguide

 
: Saravi, S.; Pertsch, T.; Setzpfandt, F.

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Physical review letters 118 (2017), No.18, Art.183603
ISSN: 0031-9007
ISSN: 1079-7114
English
Journal Article
Fraunhofer IOF ()

Abstract
We propose the use of nonlinear periodic waveguides for direct and fully integrated generation of counterpropagating photon pairs by spontaneous parametric down-conversion. Using the unique properties of Bloch modes in such periodic structures, we furthermore show that two counterpropagating phase-matching conditions can be fulfilled simultaneously, allowing for the generation of path-entangled Bell states in a single periodic waveguide. To demonstrate the feasibility of our proposal, we design a photonic crystal slab waveguide made of lithium niobate and numerically demonstrate Bell-state generation.

: http://publica.fraunhofer.de/documents/N-509737.html