Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides
Jan Philipp H\"opker, Varun B. Verma, Maximilian Protte, Raimund, Ricken, Viktor Quiring, Christof Eigner, Lena Ebers, Manfred Hammer, Jens, Foerstner, Christine Silberhorn, Richard P. Mirin, Sae Woo Nam, and Tim J., Bartley
TL;DR
This paper demonstrates integrated superconducting nanowire single-photon detectors on lithium niobate waveguides, enabling efficient photon detection for quantum photonics applications.
Contribution
It introduces the integration of tungsten silicide superconducting nanowires on lithium niobate waveguides and explores their detection capabilities and optimization strategies.
Findings
Proof-of-principle detection at 1550nm wavelength
Bidirectional waveguide coupling for orthogonal polarizations
Strategies for improving device yield and efficiency
Abstract
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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