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Author | Korneeva, Yuliya; Florya, Irina; Vdovichev, Sergey; Moshkova, Mariya; Simonov, Nikita; Kaurova, Natalia; Korneev, Alexander; Goltsman, Gregory | ||||
Title | Comparison of hot-spot formation in NbN and MoN thin superconducting films after photon absorption | Type | Conference Article | ||
Year | 2017 | Publication | IEEE Transactions on Applied Superconductivity | Abbreviated Journal | IEEE Transactions on Applied Superconductiv |
Volume | 27 | Issue | 4 | Pages | 5 |
Keywords | Thin film devices, Superconducitng photoncounting devices, Nanowire single-photon detectors | ||||
Abstract | In superconducting single-photon detectors SSPD the efficiency of local suppression of superconductivity and hotspot formation is controlled by diffusivity and electron-phonon interaction time. Here we selected a material, 3.6-nm-thick MoNx film, which features diffusivity close to those of NbN traditionally used for SSPD fabrication, but with electron-phonon interaction time an order of magnitude larger. In MoNx detectors we study the dependence of detection efficiency on bias current, photon energy, and strip width and compare it with NbN SSPD. We observe non-linear current-energy dependence in MoNx SSPD and more pronounced plateaus in dependences of detection efficiency on bias current which we attribute to longer electronphonon interaction time. |
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Notes | Approved | no | |||
Call Number | RPLAB @ kovalyuk @ | Serial | 1114 | ||
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Author | Elezov, M. S.; Ozhegov, R. V.; Goltsman, G. N.; Makarov, V. | ||||
Title | Development of the experimental setup for investigation of latching of superconducting single-photon detector caused by blinding attack on the quantum key distribution system | Type | Conference Article | ||
Year | 2017 | Publication | EPJ Web of Conferences | Abbreviated Journal | EPJ Web of Conferences |
Volume | 132 | Issue | 2 | Pages | 2 |
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Abstract | Recently bright-light control of the SSPD has been demonstrated. This attack employed a “backdoor†in the detector biasing scheme. Under bright-light illumination, SSPD becomes resistive and remains “latched†in the resistive state even when the light is switched off. While the SSPD is latched, Eve can simulate SSPD single-photon response by sending strong light pulses, thus deceiving Bob. We developed the experimental setup for investigation of a dependence on latching threshold of SSPD on optical pulse length and peak power. By knowing latching threshold it is possible to understand essential requirements for development countermeasures against blinding attack on quantum key distribution system with SSPDs. |
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Notes | Approved | no | |||
Call Number | RPLAB @ kovalyuk @ | Serial | 1116 | ||
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Author | Seleznev, V. A.; Divochiy, A. V.; Vakhtomin, Y. B.; Morozov, P. V.; Zolotov, P. I.; Vasil'ev, D. D.; Moiseev, K. M.; Malevannaya, E. I.; Smirnov, K. V. | ||||
Title | Superconducting detector of IR single-photons based on thin WSi films | Type | Conference Article | ||
Year | 2016 | Publication | J. Phys.: Conf. Ser. | Abbreviated Journal | J. Phys.: Conf. Ser. |
Volume | 737 | Issue | Pages | 012032 | |
Keywords | WSi SSPD, SNSPD, NEP | ||||
Abstract | We have developed the deposition technology of WSi thin films 4 to 9 nm thick with high temperature values of superconducting transition (Tc~4 K). Based on deposed films there were produced nanostructures with indicative planar sizes ~100 nm, and the research revealed that even on nanoscale the films possess of high critical temperature values of the superconducting transition (Tc~3.3-3.7 K) which certifies high quality and homogeneity of the films created. The first experiments on creating superconducting single-photon detectors showed that the detectors' SDE (system detection efficiency) with increasing bias current (I b) reaches a constant value of ~30% (for X=1.55 micron) defined by infrared radiation absorption by the superconducting structure. To enhance radiation absorption by the superconductor there were created detectors with cavity structures which demonstrated a practically constant value of quantum efficiency >65% for bias currents Ib>0.6-Ic. The minimal dark counts level (DC) made 1 s-1 limited with background noise. Hence WSi is the most promising material for creating single-photon detectors with record SDE/DC ratio and noise equivalent power (NEP). | ||||
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ISSN | 1742-6588 | ISBN | Medium | ||
Area | Expedition | Conference ![]() |
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Notes | Approved | no | |||
Call Number | Serial | 1235 | |||
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Author | Goltsman, G. N.; Samartsev, V. V.; Vinogradov, E. A.; Naumov, A. V.; Karimullin, K. R. | ||||
Title | New generation of superconducting nanowire single-photon detectors | Type | Conference Article | ||
Year | 2015 | Publication | EPJ Web of Conferences | Abbreviated Journal | EPJ Web of Conferences |
Volume | 103 | Issue | Pages | 01006 (1 to 2) | |
Keywords | SSPD, SNSPD | ||||
Abstract | We present an overview of recent results for new generation of infrared and optical superconducting nanowire single-photon detectors (SNSPDs) that has already demonstrated a performance that makes them devices-of-choice for many applications. SNSPDs provide high efficiency for detecting individual photons while keeping dark counts and timing jitter minimal. Besides superior detection performance over a broad optical bandwidth, SNSPDs are also compatible with an integrated optical platform as a crucial requirement for applications in emerging quantum photonic technologies. By embedding SNSPDs in nanophotonic circuits we realize waveguide integrated single photon detectors which unite all desirable detector properties in a single device. | ||||
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ISSN | 2100-014X | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | Serial | 1349 | |||
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Author | Florya, I. N.; Korneeva, Y. P.; Sidorova, M. V.; Golikov, A. D.; Gaiduchenko, I. A.; Fedorov, G. E.; Korneev, A. A.; Voronov, B. M.; Goltsman, G. N.; Samartsev, V. V.; Vinogradov, E. A.; Naumov, A. V.; Karimullin, K. R. | ||||
Title | Energy relaxtation and hot spot formation in superconducting single photon detectors SSPDs | Type | Conference Article | ||
Year | 2015 | Publication | EPJ Web of Conferences | Abbreviated Journal | EPJ Web of Conferences |
Volume | 103 | Issue | Pages | 10004 (1 to 2) | |
Keywords | SSPD, SNSPD | ||||
Abstract | We have studied the mechanism of energy relaxation and resistive state formation after absorption of a single photon for different wavelengths and materials of single photon detectors. Our results are in good agreement with the hot spot model. | ||||
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ISSN | 2100-014X | ISBN | Medium | ||
Area | Expedition | Conference ![]() |
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Notes | Approved | no | |||
Call Number | Serial | 1351 | |||
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