The effect of magnetic field on the intrinsic detection efficiency of superconducting single-photon detectors
arXiv:1410.8683 · doi:10.1063/1.4914182
Abstract
We experimentally investigate the effect of a magnetic field on photon detection in superconducting single-photon detectors. At low fields, the effect of a magnetic field is through the direct modification of the quasiparticle density of states of the superconductor, and magnetic field and bias current are interchangable, as is expected for homogeneous dirty-limit superconductors. At the field where a first vortex enters the detector, the effect of the magnetic field is reduced, up until the point where the critical current of the detector starts to be determined by flux flow. From this field on, increasing the magnetic field does not alter the detection of photons anymore, whereas it does still change the rate of dark counts. This result points at an intrinsic difference in dark and light counts, and also shows that no enhancement of the intrinsic detection efficiency of a straight SSPD wire is achievable in a magnetic field.
References in corpus (10)
- Superconducting nanowire single-photon detectors: physics and applications
- Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
- Vortex-induced dissipation in narrow current-biased thin-film superconducting strips
- Strongly disordered TiN and NbTiN s-wave superconductors probed by microwave electrodynamics
- 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
- Magnetic-field dependence of count rates in superconducting thin-film TaN single-photon detectors
- Current dependence of the 'red' boundary of superconducting single photon detectors in the modified hot spot model
- Anomalous response of superconducting titanium nitride resonators to terahertz radiation
- The effect of magnetic field on the intrinsic detection efficiency of superconducting single-photon detectors