Direct generation of entangled photon pairs in nonlinear optical waveguides

Álvaro Rodríguez Echarri, Joel D. Cox, F. Javier García De Abajo*

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Entangled photons are pivotal elements in emerging quantum information technologies. While several schemes are available for the production of entangled photons, they typically require the assistance of cumbersome optical elements to couple them to other components involved in logic operations. Here, we introduce a scheme by which entangled photon pairs are directly generated as guided mode states in optical waveguides. The scheme relies on the intrinsic nonlinearity of the waveguide material, circumventing the use of bulky optical components and their associated phase-matching constraints. Specifically, we consider an optical waveguide under normal illumination, so that photon down-conversion can take place to excite waveguide states with opposite momentum in a spectral region populated by only two accessible modes. By additionally configuring the external illumination to interfere different incident directions, we can produce maximally entangled photon-pair states, directly generated as waveguide modes with conversion efficiencies that are competitive with respect to existing macroscopic schemes. These results should find application in the design of more efficient and compact quantum optics devices.

Udgave nummer5
Sider (fra-til)1021-1032
StatusUdgivet - 1. feb. 2022

Bibliografisk note

Funding Information:
Research funding: This work has been supported in part by ERC (Advanced Grant 789 104-eNANO), the Spanish MICINN (PID2020-112625GB-I00 and SEV2015-0522), the Catalan CERCA Program, the Generalitat de Catalunya, the European Social Fund (L’FSE inverteix en el teu futur)-FEDER. J. D. C. is a Sapere Aude research leader supported by Independent Research Fund Denmark (grant no. 0165-00051B). The Center for Nano Optics is financially supported by the University of Southern Denmark (SDU 2020 funding).

Publisher Copyright:
© 2022 Álvaro Rodríguez Echarri et al., published by De Gruyter, Berlin/Boston 2022.


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