PT Journal AU Vodolazov, DY Manova, NN Korneeva, YP Korneev, AA TI Timing jitter in NbN superconducting microstrip single-photon detector SO Phys. Rev. Applied JI Phys. Rev. Applied PY 2020 BP 044041 (1 to 8) VL 14 IS 4 DI 10.1103/PhysRevApplied.14.044041 DE NbN SSPD; SNSPD AB We experimentally study timing jitter of single-photon detection by NbN superconducting strips with width w ranging from 190 nm to 3μm. We find that timing jitter of both narrow (190 nm) and micron-wide strips is about 40 ps at currents where internal detection efficiency η saturates and it is close to our instrumental jitter. We also calculate intrinsic timing jitter in wide strips using the modified time-dependent Ginzburg-Landau equation coupled with a two-temperature model. We find that with increasing width the intrinsic timing jitter increases and the effect is most considerable at currents where a rapid growth of η changes to saturation. We relate it with complicated vortex and antivortex dynamics, which depends on a photon’s absorption site across the strip and its width. The model also predicts that at current close to depairing current the intrinsic timing jitter of a wide strip could be about ℏ/kBTc (Tc is a critical temperature of superconductor), i.e., the same as for a narrow strip. ER