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Reset dynamics and latching in niobium superconducting nanowire single-photon detectors

Annunziatella, Anthony J. and Quaranta, Orlando and Santavicca, Daniel F. and Casaburi, Alessandro and Frunzio, Luigi and Ejrnaes, Mikkel and Rooks, Michael J. and Cristiano, Roberto and Pagano, Sergio and Frydman, Aviad and Prober, Daniel E. (2010) Reset dynamics and latching in niobium superconducting nanowire single-photon detectors. Journal of Applied Physics, 108 (8). Art. No. 084507. ISSN 0021-8979. doi:10.1063/1.3498809.

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We study the reset dynamics of niobium(Nb)superconductingnanowire 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. We compare our results to studies of reset and latching in niobium nitride SNSPDs.

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Additional Information:© 2010 American Institute of Physics. �Received 29 June 2010; accepted 30 August 2010; published online 22 October 2010�. This work was supported by NSF under Grant Nos. ECS-0622035 and DMR-0907082 and an NSF Graduate Research Fellowship to one of us (A.J.A.).
Group:Keck Institute for Space Studies
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NSF Graduate Research FellowshipUNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:20160311-134645367
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65308
Deposited By: Colette Connor
Deposited On:14 Mar 2016 21:13
Last Modified:10 Nov 2021 23:43

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