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Zolotov, P.; Divochiy, A.; Vakhtomin, Y.; Moshkova, M.; Morozov, P.; Seleznev, V.; Smirnov, K. |
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Photon-number-resolving SSPDs with system detection efficiency over 50% at telecom range |
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Conference Article |
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2018 |
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Proc. AIP Conf. |
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1936 |
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1 |
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020019 |
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NbN PNR SSPD, SNSPD |
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We used technology of making high-efficiency superconducting single-photon detectors as a basis for improvement of photon-number-resolving devices. By adding optical cavity and using an improved NbN superconducting film, we enhanced previously reported system detection efficiency at telecom range for such detectors. Our results show that implementation of optical cavity helps to develop four-section device with quantum efficiency over 50% at 1.55 µm. Performed experimental studies of detecting multi-photon optical pulses showed irregularities over defining multi-photon through single-photon quantum efficiency. |
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doi:10.1063/1.5025457 |
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1231 |
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Smirnov, K.; Moshkova, M.; Antipov, A.; Morozov, P.; Vakhtomin, Y. |
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Title |
The cascade switching of the photon number resolving superconducting single-photon detectors |
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Journal Article |
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Year |
2021 |
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IEEE Trans. Appl. Supercond. |
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IEEE Trans. Appl. Supercond. |
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31 |
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2 |
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1-4 |
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PNR SSPD, SNSPD |
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In this article, present the first detailed study of cascade switching in superconducting photon number resolving detectors. The detectors were made in the form of four parallel nanowires, coupled with the single-mode optical fiber and mounted into a closed-cycle refrigerator with a temperature of 2.1 K. We found out the value of additional false pulses (N cas.sw. ) appearing due to cascade switching and showed that it is possible to set up the detector bias current that corresponds to a high level of the detection efficiency and a low level of N cas.sw. simultaneously. We reached the detection efficiency of 60% and N cas.sw. = 0.3%. |
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1051-8223 |
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1796 |
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Divochiy, A.; Misiaszek, M.; Vakhtomin, Y.; Morozov, P.; Smirnov, K.; Zolotov, P.; Kolenderski, P. |
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Single photon detection system for visible and infrared spectrum range |
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Journal Article |
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2018 |
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Opt. Lett. |
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Opt. Lett. |
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43 |
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24 |
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6085-6088 |
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We demonstrate niobium nitride based superconducting single-photon detectors sensitive in the spectral range 452-2300 nm. The system performance was tested in a real-life experiment with correlated photons generated by means of spontaneous parametric downconversion, where one photon was in the visible range and the other was in the infrared range. We measured a signal to noise ratio as high as 4x10(4) in our detection setting. A photon detection efficiency as high as 64% at 1550 nm and 15% at 2300 nm was observed. |
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0146-9592 |
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https://arxiv.org/abs/1807.04273 |
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1227 |
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Moshkova, M.; Divochiy, A.; Morozov, P.; Vakhtomin, Y.; Antipov, A.; Zolotov, P.; Seleznev, V.; Ahmetov, M.; Smirnov, K. |
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High-performance superconducting photon-number-resolving detectors with 86% system efficiency at telecom range |
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Journal Article |
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2019 |
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J. Opt. Soc. Am. B |
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J. Opt. Soc. Am. B |
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36 |
Issue |
3 |
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B20 |
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NbN PNR SSPD, SNSPD |
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The use of improved fabrication technology, highly disordered NbN thin films, and intertwined section topology makes it possible to create high-performance photon-number-resolving superconducting single-photon detectors (PNR SSPDs) that are comparable to conventional single-element SSPDs at the telecom range. The developed four-section PNR SSPD has simultaneously an 86±3% system detection efficiency, 35 cps dark count rate, ∼2 ns dead time, and maximum 90 ps jitter. An investigation of the PNR SSPD’s detection efficiency for multiphoton events shows good uniformity across sections. As a result, such a PNR SSPD is a good candidate for retrieving the photon statistics for light sources and quantum key distribution systems. |
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0740-3224 |
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1225 |
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Zolotov, P.; Divochiy, A.; Vakhtomin, Y.; Seleznev, V.; Morozov, P.; Smirnov, K. |
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Title |
Superconducting single-photon detectors made of ultra-thin VN films |
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Conference Article |
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2018 |
Publication |
KnE Energy |
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KnE Energy |
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3 |
Issue |
3 |
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83-89 |
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We optimized technology of thin VN films deposition in order to study VN-based superconducting single-photon detectors. Investigation of the main VN film parameters showed that this material has lower resistivity compared to commonly used NbN. Fabricated from obtained films devices showed 100% intrinsic detection efficiency at 900 nm, at the temperature of 1.7 K starting with the bias current of 0.7·I |
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1230 |
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