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Tunable generation of entangled photons in a nonlinear directional coupler

  • The on-chip integration of quantum light sources has enabled the realization of complex quantum photonic circuits. However, for the practical implementation of such circuits in quantum information applications, it is crucial to develop sources delivering entangled quantum photon states with on-demand tunability. Here we propose and experimentally demonstrate the concept of a widely tunable quantum light source based on spontaneous parametric down-conversion in a simple nonlinear directional coupler. We show that spatial photon-pair correlations and entanglement can be reconfigured on-demand by tuning the phase difference between the pump beams and the phase mismatch inside the structure. We experimentally demonstrate the generation of split states, robust N00N states, various intermediate regimes and biphoton steering on a single chip. Furthermore we theoretically investigate other regimes allowing all-optically tunable generation of all Bell states and flexible control of path-energy entanglement. Such wide-range capabilities of a structure comprised of just two coupled nonlinear waveguides are attributed to the intricate interplay between linear coupling and nonlinear phase matching. This scheme provides an important advance towards the realization of reconfigurable quantum circuitry.

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Metadaten
Author:Frank SetzpfandtORCiD, Alexander S. SolntsevORCiD, James TitchenerORCiD, Che Wen Wu, Chunle Xiong, Roland SchiekORCiD, Thomas PertschORCiD, Dragomir N. NeshevORCiD, Andrey A. Sukhorukov
DOI:https://doi.org/10.1002/lpor.201500216
Parent Title (English):Laser & Photonics Reviews
Publisher:WILEY-VCH
Document Type:Article
Language:English
Year of first Publication:2016
Release Date:2022/04/06
Tag:ARRAYS; GATES; PAIR GENERATION; WAVE; directional coupler; entanglement; nonlinearity; photon pairs; waveguides
Volume:10
Issue:1
First Page:131
Last Page:136
Institutes:Fakultät Elektro- und Informationstechnik
research focus:Information und Kommunikation
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG