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Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides

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arxiv 2104.12500 v1 pith:NO2FAWBM submitted 2021-04-26 quant-ph physics.ins-detphysics.optics

Jan Philipp Höpker , Varun B. Verma , Maximilian Protte , Raimund Ricken , Viktor Quiring , Christof Eigner , Lena Ebers , Manfred Hammer
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Jens Foerstner Christine Silberhorn Richard P. Mirin Sae Woo Nam Tim J. Bartley
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classification quant-phphysics.ins-detphysics.optics
keywords detectiondetectorsefficiencyin-diffusedlithiumnanowireniobatesingle-photon
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We demonstrate the integration of amorphous tungsten silicide superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides. We show proof-of-principle detection of evanescently-coupled photons of 1550nm wavelength using bidirectional waveguide coupling for two orthogonal polarization directions. We investigate the internal detection efficiency as well as detector absorption using coupling-independent characterization measurements. Furthermore, we describe strategies to improve the yield and efficiency of these devices.

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