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Over the past two decades, the fast development of superconducting nanowire single photon detector (SNSPD) has made them the detector of choice for modern stringent quantum optics experiments. SNSPD offers remarkably high efficiencies, approching unity efficiency, a few pico-second time resolution, and gigahertz counting rates. The recovery time τ of the SNSPD is one of the key parameters influencing its efficiency at high photon fluxes. Here we report on preliminary results of controlling the response speed of the SNSPD by introducing a tunable resistor RS in the electric circuit.
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