We propose a new biasing concept for superconducting nanowire single photon detectors (SNSPD).
It features the frequency-voltage relation of a Josephson junction to generate a bias supply with quantum precision.
The quantum bias concept is characterized by a very low resistor and a frequency controlled noise-free quantum voltage source. In the first experiments, we intentionally slow down the time constant by using a very small bias resistor. We obtain an intrinsic time constant of about 100μs. Corresponding to this time constant, the generated current pulses for the Josephson junction through the SNSPD cause in time-average a constant bias current.
The SNSPD as well as the Josephson junction are based on superconducting thin film technology and can be fabricated in general on the same substrate.
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