Timing jitter in photon detection by straight superconducting nanowires: Effect of magnetic field and photon flux
arXiv:1806.07183 · doi:10.1103/PhysRevB.98.134504
Abstract
We studied the effect of the external magnetic field and photon flux on timing jitter in photon detection by straight superconducting NbN nanowires. At two wavelengths 800 and 1560 nm, statistical distribution in the appearance time of the photon count exhibits Gaussian shape at small times and exponential tail at large times. The characteristic exponential time is larger for photons with smaller energy and increases with external magnetic field while variations in the Gaussian part of the distribution are less pronounced. Increasing photon flux drives the nanowire from quantum detection mode to the bolometric mode that averages out fluctuations of the total number of nonequilibrium electrons created by the photon and drastically reduces jitter. The difference between Gaussian parts of distributions for these two modes provides the measure for the electron-number fluctuations. Corresponding standard deviation increases with the photon energy. We show that the two-dimensional hot-spot detection model explains qualitatively the effect of magnetic field.
References in corpus (18)
- Geometry-dependent critical currents in superconducting nanocircuits
- Single-photon detectors combining ultra-high efficiency, detection-rates, and timing resolution
- Theory of single photon detection by 'dirty' current-carrying superconducting strip based on the kinetic equation approach
- Current Assisted, Thermally Activated Flux Liberation in Ultrathin Nanopatterned NbN Superconducting Meander Structures
- Vortex-assisted photon counts and their magnetic field dependence in single-photon detectors
- Photon detection by current-carrying superconducting film: A time-dependent Ginzburg-Landau approach
- Superconducting nanowire detector jitters limited by detector geometry
- High-detection efficiency and low-timing jitter with amorphous superconducting nanowire single-photon detectors
- Fano fluctuations in superconducting nanowire single-photon detectors
- Vortex assisted mechanism of photon counting in superconducting nanowire single photon detector revealed by external magnetic field
- Geometry-induced reduction of the critical current in superconducting nanowires
- Physical mechanisms of timing jitter in photon detection by current carrying superconducting nanowires
- Detection Mechanism in SNSPD: Numerical Results of a Conceptually Simple, Yet Powerful Detection Model
- Intrinsic detection efficiency of superconducting single photon detector in the modified hot spot model
- Microwave dynamics of high aspect ratio superconducting nanowires studied using self-resonance
- Asymmetry in the effect of magnetic field on photon detection and dark counts in bended nanostrips
- Enhancement of superconductivity in NbN nanowires by negative electron-beam lithography with positive resist
- Temporary cooling of quasiparticles and delay in voltage response of superconducting bridges after abrupt switching on the supercritical current