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.
@article{arxiv.2104.12500,
title = {Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides},
author = {Jan Philipp Höpker and Varun B. Verma and Maximilian Protte and Raimund Ricken and Viktor Quiring and Christof Eigner and Lena Ebers and Manfred Hammer and Jens Foerstner and Christine Silberhorn and Richard P. Mirin and Sae Woo Nam and Tim J. Bartley},
journal= {arXiv preprint arXiv:2104.12500},
year = {2021}
}