Due to the constantly increasing demand for single photon detection at telecom wavelengths, superconducting micron-scale bridges (SMSPDs) are attracting attention as a feasible alternative to superconducting nanowire superconducting detectors (SNSPDs). Simple geometry, combined with tunable wavelength response and compatibility with affordable, large-scale fabrication processes, make SMSPDs an alternative to conventional single photon detectors.
SMSPDs exhibit short recovery times and good temporal resolution, enabling integration into photonic circuits where high response rate is essential for reliable operation. We realized 2 µm wide NbTiN microbridge single photon detector integrated with a SiO2/TiO2 Bragg resonator, for the telecom C-band. Furthermore, we correlate the microbridge geometry with observed behavior to validate the quality of fabricated structures and monitor its effect on detector performance.
KEYWORDS: Superconductors, Single photon detectors, Sensors, Single photon, Signal to noise ratio, Telecommunications, Superconducting detectors, Signal detection, Quantum efficiency, Picosecond phenomena
We report a single photon detector based on NbTiN microbridges, suitable for operation within telecommunication wavelengths. We observed an excellent signal-to-noise ratio of the readout signal while the corresponding jitter contributed by electrical noise was measured to be less than 10 ps. Routing the current through a parallel electrical connection to set the microbridge back to the superconducting state after photon absorption enabled us to overcome the hysteresis of the state transition. Our approach combines facile fabrication of fast microscale detectors with efficient current redistribution mechanism, enabling prospective applications in quantum photonics which requires accurate estimation of photon arrival events.
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