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Suspended Spot-Size Converters for Scalable Single-Photon Devices

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arxiv 1906.09311 v1 pith:2M4H5V5W submitted 2019-06-21 physics.app-ph physics.opticsquant-ph

Suspended Spot-Size Converters for Scalable Single-Photon Devices

classification physics.app-ph physics.opticsquant-ph
keywords quantumconvertercouplingefficientepoxyphotonsscalablesingle
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report on the realization of a highly efficient optical spot-size converter for the end-face coupling of single photons from GaAs-based nanophotonic waveguides with embedded quantum dots. The converter is realized using an inverted taper and an epoxy polymer overlay providing a 1.3~$\mu$m output mode field diameter. We demonstrate the collection of single photons from a quantum dot into a lensed fiber with a rate of 5.84$\pm0.01$~MHz and estimate a chip-to-fiber coupling efficiency of $\sim48$~\%. The stability and compatibility with cryogenic temperatures make the epoxy waveguides a promising material to realize efficient and scalable interconnects between heterogeneous quantum photonic integrated circuits.

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