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Superconducting nanowires are widely used as sensitive single photondetectors with wide spectral coverage and high timing resolution. We describe ademonstration of an array of DC biased superconducting nanowire single photondetectors read out with a microwave multiplexing circuit. In this design, eachindividual nanowire is part of a resonant LC circuit where the inductance isdominated by the kinetic inductance of the nanowire. The circuit also containstwo parallel plate capacitors, one of them is in parallel with the inductor andthe other is coupled to a microwave transmission line which carries the signalsto a cryogenic low noise amplifier. All of the nanowires are connected viaresistors to a single DC bias line that enables the nanowires to be currentbiased close to their critical current. When a photon hits a nanowire itcreates a normal hot spot which produces a voltage pulse across the LC circuit.This pulse rings down at the resonant frequency of the LC circuit over a timeperiod that is fixed by the quality factor. We present measurements of an arrayof these devices and an evaluation of their performance in terms of frequencyand time response.

Demonstration of microwave multiplexed readout of DC biased superconducting nanowire detectors