Figure 4

Histogram of temporal variations in the latency between the arrival of a photon at the nanowire and a corresponding electrical detector output pulse (jitter measurement) for an SNSPD with a detector length of 30 µm and a 110 nm wide nanowire. A fit to the data with a Gaussian function reveals a FWHM of \(\left( {27.8 \pm 0.1} \right) {\text{ps}}\). Inset: Dependence of the FWHM jitter value on bias current for several SNSPDs with varying geometry, resulting in different detector critical currents. Each device was biased at 90% of the experimental critical current. A fit to the data reveals a \(1/I_{{{\text{bias}}}}\)-dependence of the jitter, indicating a large contribution from the electrical readout circuit.