Abstract
We show the proof-of-principle detection of light at 1550 nm coupled evanescently from a titanium in-diffused lithium niobate waveguide to a superconducting transition edge sensor. The coupling efficiency strongly depends on the polarization, the overlap between the evanescent field, and the detector structure. We experimentally demonstrate polarization sensitivity of this coupling as well as photon-number resolution of the integrated detector. The combination of transition edge sensors and lithium niobate waveguides can open the field for a variety of new quantum optics experiments.
Highlights
Integrated photonic circuits are widely used to realize compact and complex quantum optics experiments
We report on the first proof-of-principle evanescent single-photon detection with a transition edge sensor on a lithium niobate waveguide
The detection efficiency can be significantly increased by changing the detector and/or waveguide geometry
Summary
Integrated photonic circuits are widely used to realize compact and complex quantum optics experiments They enable scalable creation and processing of quantum states which can be used in communication, computation, and simulation protocols to potentially outperform classical systems.. In an in-line geometry, nondetected (and nonscattered) photons remain inside the waveguide; this geometry potentially allows for further processing of undetected photons.15 On platforms such as silicon or III-V semiconductor waveguides, the integration of superconducting nanowire single photon detectors (SNSPDs) or transition edge sensors (TESs) has been realized. We report on the first proof-of-principle evanescent single-photon detection with a transition edge sensor on a lithium niobate waveguide. This completes the toolbox for integrated quantum optics on this platform, adding integrated detection. IV, we show our experimental results including photon-number resolution up to six photons, system detection efficiency measurements for both polarizations, and first results for the energy resolution and decay time
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