Nanophotonic circuitry and superconducting nanowires have been successfully combined for detecting single photons, propagating in an integrated photonic circuit, with high efficiency and low noise and timing uncertainty. Waveguide-integrated superconducting nanowire single-photon detectors (SNSPDs) can nowadays be engineered to achieve subnanosecond recovery times and can potentially be adopted for applications requiring Gcps count rates. However, particular attention shall be paid to such an extreme count rate regime since artifacts in the detector functionality emerge. In particular, a count-rate dependent detection efficiency has been encountered that can compromise the accuracy of quantum detector tomography experiments. Here, we investigate the response of waveguide-integrated SNSPDs at high photon flux and identify the presence of parasitic currents due to the accumulation of charge in the readout electronics to cause the above-mentioned artifact in the detection efficiency. Our approach allows us to determine the maximum photon count rate at which the detector can be operated without adverse effects. Our findings are particularly important to avoid artifacts when applying SNSPDs for quantum tomography.
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2 September 2019
Research Article|
September 06 2019
Analysis of the detection response of waveguide-integrated superconducting nanowire single-photon detectors at high count rate Available to Purchase
Simone Ferrari;
Simone Ferrari
a)
1
Institute of Physics, University of Münster
, Münster 48149, Germany
2
Münster Nanofabrication Facility (MNF), University of Münster
, Münster 48149, Germany
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Vadim Kovalyuk;
Vadim Kovalyuk
3
Department of Physics, Moscow State Pedagogical University
, Moscow 119992, Russia
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Andreas Vetter
;
Andreas Vetter
4
Institute of Nanotechnology (INT), Karlsruhe Institute of Technology
, 76344 Eggenstein-Leopoldshafen, Germany
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Changhyoup Lee;
Changhyoup Lee
5
Institute of Theoretical Solid State Physics (TFP), Karlsruhe Institute of Technology
, 76131 Karlsruhe, Germany
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Carsten Rockstuhl;
Carsten Rockstuhl
4
Institute of Nanotechnology (INT), Karlsruhe Institute of Technology
, 76344 Eggenstein-Leopoldshafen, Germany
5
Institute of Theoretical Solid State Physics (TFP), Karlsruhe Institute of Technology
, 76131 Karlsruhe, Germany
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Alexander Semenov;
Alexander Semenov
3
Department of Physics, Moscow State Pedagogical University
, Moscow 119992, Russia
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Gregory Gol'tsman;
Gregory Gol'tsman
3
Department of Physics, Moscow State Pedagogical University
, Moscow 119992, Russia
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Wolfram Pernice
Wolfram Pernice
1
Institute of Physics, University of Münster
, Münster 48149, Germany
2
Münster Nanofabrication Facility (MNF), University of Münster
, Münster 48149, Germany
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Simone Ferrari
1,2,a)
Vadim Kovalyuk
3
Andreas Vetter
4
Changhyoup Lee
5
Carsten Rockstuhl
4,5
Alexander Semenov
3
Gregory Gol'tsman
3
Wolfram Pernice
1,2
1
Institute of Physics, University of Münster
, Münster 48149, Germany
2
Münster Nanofabrication Facility (MNF), University of Münster
, Münster 48149, Germany
3
Department of Physics, Moscow State Pedagogical University
, Moscow 119992, Russia
4
Institute of Nanotechnology (INT), Karlsruhe Institute of Technology
, 76344 Eggenstein-Leopoldshafen, Germany
5
Institute of Theoretical Solid State Physics (TFP), Karlsruhe Institute of Technology
, 76131 Karlsruhe, Germany
a)
Electronic mail: [email protected]
Appl. Phys. Lett. 115, 101104 (2019)
Article history
Received:
June 07 2019
Accepted:
August 19 2019
Citation
Simone Ferrari, Vadim Kovalyuk, Andreas Vetter, Changhyoup Lee, Carsten Rockstuhl, Alexander Semenov, Gregory Gol'tsman, Wolfram Pernice; Analysis of the detection response of waveguide-integrated superconducting nanowire single-photon detectors at high count rate. Appl. Phys. Lett. 2 September 2019; 115 (10): 101104. https://doi.org/10.1063/1.5113652
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