Physics – Condensed Matter – Superconductivity
Scientific paper
2010-08-05
J. Appl. Phys. 108, 084507 (2010)
Physics
Condensed Matter
Superconductivity
Scientific paper
We study the reset dynamics of niobium (Nb) superconducting nanowire single-photon detectors (SNSPDs) using experimental measurements and numerical simulations. The numerical simulations of the detection dynamics agree well with experimental measurements, using independently determined parameters in the simulations. We find that if the photon-induced hotspot cools too slowly, the device will latch into a dc resistive state. To avoid latching, the time for the hotspot to cool must be short compared to the inductive time constant that governs the resetting of the current in the device after hotspot formation. From simulations of the energy relaxation process, we find that the hotspot cooling time is determined primarily by the temperature-dependent electron-phonon inelastic time. Latching prevents reset and precludes subsequent photon detection. Fast resetting to the superconducting state is therefore essential, and we demonstrate experimentally how this is achieved.
Annunziata Anthony J.
Casaburi Alessandro
Cristiano Roberto
Ejrnaes Mikkel
Frunzio Luigi
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