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RF-amplifier-free superconducting nanowire single-photon detector system

We used a superconducting nanowire single photon detector integrated with a current reservoir in a closed-cycle cryocooler to demonstrate RF-amplifier-free photon counting. By removing the RF amplifiers, we completely eliminated the capacitor-coupling effect, consequently increased the switching current from 48.5 μA to 50.5 μA and increased the device efficiency from 26% to 32%. The L/R time constant was reduced by a factor of 1.27.