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Author | Smirnov, K.; Divochiy, A.; Vakhtomin, Y.; Morozov, P.; Zolotov, P.; Antipov, A.; Seleznev, V. | ||||
Title | NbN single-photon detectors with saturated dependence of quantum efficiency | Type | Journal Article | ||
Year | 2018 | Publication | Supercond. Sci. Technol. | Abbreviated Journal | Supercond. Sci. Technol. |
Volume | 31 | Issue | 3 | Pages | 035011 (1 to 8) |
Keywords | NbN SSPD, SNSPD | ||||
Abstract | The possibility of creating NbN superconducting single-photon detectors with saturated dependence of quantum efficiency (QE) versus normalized bias current was investigated. It was shown that the saturation increases for the detectors based on finer films with a lower value of Rs300/Rs20. The decreasing of Rs300/Rs20 was related to the increasing influence of quantum corrections to conductivity of superconductors and, in turn, to the decrease of the electron diffusion coefficient. The best samples have a constant value of system QE 94% at Ib/Ic ~ 0.8 and wavelength 1310 nm. | ||||
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ISSN | 0953-2048 | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | Serial | 1232 | |||
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Author | Smirnov, K. V.; Divochiy, A. V.; Vakhtomin, Y. B.; Sidorova, M. V.; Karpova, U. V.; Morozov, P. V.; Seleznev, V. A.; Zotova, A. N.; Vodolazov, D. Y. | ||||
Title | Rise time of voltage pulses in NbN superconducting single photon detectors | Type | Journal Article | ||
Year | 2016 | Publication | Appl. Phys. Lett. | Abbreviated Journal | Appl. Phys. Lett. |
Volume | 109 | Issue | 5 | Pages | 052601 |
Keywords | SSPD, SNSPD | ||||
Abstract | We have found experimentally that the rise time of voltage pulse in NbN superconducting single photon detectors increases nonlinearly with increasing the length of the detector L. The effect is connected with dependence of resistance of the detector Rn, which appears after photon absorption, on its kinetic inductance Lk and, hence, on the length of the detector. This conclusion is confirmed by our calculations in the framework of two temperature model. D.Yu.V. acknowledges the support from the Russian Foundation for Basic Research (Project No. 15-42-02365). K.V.S. acknowledges the financial support from the Ministry of Education and Science of the Russian Federation (Contract No. 3.2655.2014/K). |
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ISSN | 0003-6951 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1236 | |||
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Author | Sidorova, M.; Semenov, Alexej D.; Hübers, H.-W.; Ilin, K.; Siegel, M.; Charaev, I.; Moshkova, M.; Kaurova, N.; Goltsman, G. N.; Zhang, X.; Schilling, A. | ||||
Title | Electron energy relaxation in disordered superconducting NbN films | Type | Journal Article | ||
Year | 2020 | Publication | Phys. Rev. B | Abbreviated Journal | Phys. Rev. B |
Volume | 102 | Issue | 5 | Pages | 054501 (1 to 15) |
Keywords | NbN SSPD, SNSPD, HEB, bandwidth, relaxation time | ||||
Abstract | We report on the inelastic-scattering rate of electrons on phonons and relaxation of electron energy studied by means of magnetoconductance, and photoresponse, respectively, in a series of strongly disordered superconducting NbN films. The studied films with thicknesses in the range from 3 to 33 nm are characterized by different Ioffe-Regel parameters but an almost constant product qTl (qT is the wave vector of thermal phonons and l is the elastic mean free path of electrons). In the temperature range 14–30 K, the electron-phonon scattering rates obey temperature dependencies close to the power law 1/τe−ph∼Tn with the exponents n≈3.2–3.8. We found that in this temperature range τe−ph and n of studied films vary weakly with the thickness and square resistance. At 10 K electron-phonon scattering times are in the range 11.9–17.5 ps. The data extracted from magnetoconductance measurements were used to describe the experimental photoresponse with the two-temperature model. For thick films, the photoresponse is reasonably well described without fitting parameters, however, for thinner films, the fit requires a smaller heat capacity of phonons. We attribute this finding to the reduced density of phonon states in thin films at low temperatures. We also show that the estimated Debye temperature in the studied NbN films is noticeably smaller than in bulk material. | ||||
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ISSN | 2469-9950 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1266 | |||
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Author | Shcherbatenko, M. L.; Elezov, M. S.; Goltsman, G. N.; Sych, D. V. | ||||
Title | Sub-shot-noise-limited fiber-optic quantum receiver | Type | Journal Article | ||
Year | 2020 | Publication | Phys. Rev. A | Abbreviated Journal | Phys. Rev. A |
Volume | 101 | Issue | 3 | Pages | 032306 (1 to 5) |
Keywords | SSPD mixer, SNSPD | ||||
Abstract | We experimentally demonstrate a quantum receiver based on the Kennedy scheme for discrimination between two phase-modulated weak coherent states. The receiver is assembled entirely from standard fiber-optic elements and operates at a conventional telecom wavelength of 1.55 μm. The local oscillator and the signal are transmitted through different optical fibers, and the displaced signal is measured with a high-efficiency superconducting nanowire single-photon detector. We show the discrimination error rate is two times below that of a shot-noise-limited receiver with the same system detection efficiency. | ||||
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ISSN | 2469-9926 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1268 | |||
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Author | Elezov, M.; Ozhegov, R.; Goltsman, G.; Makarov, V. | ||||
Title | Countermeasure against bright-light attack on superconducting nanowire single-photon detector in quantum key distribution | Type | Journal Article | ||
Year | 2019 | Publication | Opt. Express | Abbreviated Journal | Opt. Express |
Volume | 27 | Issue | 21 | Pages | 30979-30988 |
Keywords | SSPD, SNSPD | ||||
Abstract | We present an active anti-latching system for superconducting nanowire single-photon detectors. We experimentally test it against a bright-light attack, previously used to compromise security of quantum key distribution. Although our system detects continuous blinding, the detector is shown to be partially blindable and controllable by specially tailored sequences of bright pulses. Improvements to the countermeasure are suggested. | ||||
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Language | English | Summary Language | Original Title | ||
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Series Volume | Series Issue | Edition | |||
ISSN | 1094-4087 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | PMID:31684339 | Approved | no | ||
Call Number | Serial | 1275 | |||
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Author | Korneeva, Y. P.; Vodolazov, D. Y.; Semenov, A. V.; Florya, I. N.; Simonov, N.; Baeva, E.; Korneev, A. A.; Goltsman, G. N.; Klapwijk, T. M. | ||||
Title | Optical single-photon detection in micrometer-scale NbN bridges | Type | Journal Article | ||
Year | 2018 | Publication | Phys. Rev. Applied | Abbreviated Journal | Phys. Rev. Applied |
Volume | 9 | Issue | 6 | Pages | 064037 (1 to 13) |
Keywords | NbN SSPD, SNSPD | ||||
Abstract | We demonstrate experimentally that single-photon detection can be achieved in micrometer-wide NbN bridges, with widths ranging from 0.53 to 5.15 μm and for photon wavelengths of 408 to 1550 nm. The microbridges are biased with a dc current close to the experimental critical current, which is estimated to be about 50% of the theoretically expected depairing current. These results offer an alternative to the standard superconducting single-photon detectors, based on nanometer-scale nanowires implemented in a long meandering structure. The results are consistent with improved theoretical modeling based on the theory of nonequilibrium superconductivity, including the vortex-assisted mechanism of initial dissipation. | ||||
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ISSN | 2331-7019 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1303 | |||
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Author | Korneev, A.; Korneeva, Y.; Florya, I.; Semenov, A.; Goltsman, G. | ||||
Title | Photon switching statistics in multistrip superconducting single-photon detectors | Type | Journal Article | ||
Year | 2018 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | IEEE Trans. Appl. Supercond. |
Volume | 28 | Issue | 7 | Pages | 1-4 |
Keywords | SSPD, SNSPD | ||||
Abstract | We study photon count statistics in superconducting single-photon detectors consisting of up to 70 narrow superconducting strips connected in parallel. Using interarrival time analysis, we demonstrate that our samples are operated in the “arm-trigger” regime and require up to seven subsequently absorbed photons to form a resistive state in the whole sample. We also performed numerical simulation of the light and dark count rates versus detector bias current, which are in good agreement with the experimental results. | ||||
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Series Volume | Series Issue | Edition | |||
ISSN | 1051-8223 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1304 | |||
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Author | Sidorova, M. V.; Kozorezov, A. G.; Semenov, A. V.; Korneeva, Y. P.; Mikhailov, M. Y.; Devizenko, A. Y.; Korneev, A. A.; Chulkova, G. M.; Goltsman, G. N. | ||||
Title | Nonbolometric bottleneck in electron-phonon relaxation in ultrathin WSi films | Type | Journal Article | ||
Year | 2018 | Publication | Phys. Rev. B | Abbreviated Journal | Phys. Rev. B |
Volume | 97 | Issue | 18 | Pages | 184512 (1 to 13) |
Keywords | WSi films, diffusion constant, SSPD, SNSPD | ||||
Abstract | We developed the model of the internal phonon bottleneck to describe the energy exchange between the acoustically soft ultrathin metal film and acoustically rigid substrate. Discriminating phonons in the film into two groups, escaping and nonescaping, we show that electrons and nonescaping phonons may form a unified subsystem, which is cooled down only due to interactions with escaping phonons, either due to direct phonon conversion or indirect sequential interaction with an electronic system. Using an amplitude-modulated absorption of the sub-THz radiation technique, we studied electron-phonon relaxation in ultrathin disordered films of tungsten silicide. We found an experimental proof of the internal phonon bottleneck. The experiment and simulation based on the proposed model agree well, resulting in τe−ph∼140–190 ps at TC=3.4K, supporting the results of earlier measurements by independent techniques. | ||||
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ISSN | 2469-9950 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1305 | |||
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Author | Florya, I. N.; Korneeva, Y. P.; Mikhailov, M. Y.; Devizenko, A. Y.; Korneev, A. A.; Goltsman, G. N. | ||||
Title | Photon counting statistics of superconducting single-photon detectors made of a three-layer WSi film | Type | Journal Article | ||
Year | 2018 | Publication | Low Temp. Phys. | Abbreviated Journal | Low Temp. Phys. |
Volume | 44 | Issue | 3 | Pages | 221-225 |
Keywords | WSi SSPD, SNSPD | ||||
Abstract | Superconducting nanowire single-photon detectors (SNSPD) are used in quantum optics when record-breaking time resolution, high speed, and exceptionally low levels of dark counts (false readings) are required. Their detection efficiency is limited, however, by the absorption coefficient of the ultrathin superconducting film for the detected radiation. One possible way of increasing the detector absorption without limiting its broadband response is to make a detector in the form of several vertically stacked layers and connect them in parallel. For the first time we have studied single-photon detection in a multilayer structure consisting of three superconducting layers of amorphous tungsten silicide (WSi) separated by thin layers of amorphous silicon. Two operating modes of the detector are illustrated: an avalanche regime and an arm-trigger regime. A shift in these modes occurs at currents of ∼0.5–0.6 times the critical current of the detector. This work was supported by technical task No. 88 for scientific research at the National Research University “Higher School of Economics,” Grant No. 14.V25.31.0007 from the Ministry of Education and Science of Russia, and the work of G. N. Goltsman was supported by task No. 3.7328.2017/VU of the Ministry of Education and Science of Russia. |
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Series Volume | Series Issue | Edition | |||
ISSN | 1063-777X | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1310 | |||
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Author | Vodolazov, D. Y.; Korneeva, Y. P.; Semenov, A. V.; Korneev, A. A.; Goltsman, G. N. | ||||
Title | Vortex-assisted mechanism of photon counting in a superconducting nanowire single-photon detector revealed by external magnetic field | Type | Journal Article | ||
Year | 2015 | Publication | Phys. Rev. B | Abbreviated Journal | Phys. Rev. B |
Volume | 92 | Issue | 10 | Pages | 104503 (1 to 9) |
Keywords | SSPD, SNSPD | ||||
Abstract | We use an external magnetic field to probe the detection mechanism of a superconducting nanowire single-photon detector. We argue that the hot belt model (which assumes partial suppression of the superconducting order parameter Δ across the whole width of the superconducting nanowire after absorption of the photon) does not explain observed weak-field dependence of the photon count rate (PCR) for photons with λ=450nm and noticeable decrease of PCR (with increasing the magnetic field) in a range of the currents for photons with wavelengths λ=450–1200nm. Found experimental results for all studied wavelengths can be explained by the vortex hot spot model (which assumes partial suppression of Δ in the area with size smaller than the width of the nanowire) if one takes into account nucleation and entrance of the vortices to the photon induced hot spot and their pinning by the hot spot with relatively large size and strongly suppressed Δ. | ||||
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Series Volume | Series Issue | Edition | |||
ISSN | 1098-0121 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1343 | |||
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Author | Korneeva, Y.; Sidorova, M.; Semenov, A.; Krasnosvobodtsev, S.; Mitsen, K.; Korneev, A.; Chulkova, G.; Goltsman, G. | ||||
Title | Comparison of hot-spot formation in NbC and NbN single-photon detectors | Type | Journal Article | ||
Year | 2016 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | IEEE Trans. Appl. Supercond. |
Volume | 26 | Issue | 3 | Pages | 1-4 |
Keywords | NbC, NbN SSPD, SNSPD | ||||
Abstract | We report an experimental investigation of the hot-spot evolution in superconducting single-photon detectors made of disordered superconducting materials with different diffusivity and energy downconversion time values, i.e., 33-nm-thick NbN and 23-nm-thick NbC films. We have demonstrated that, in NbC film, only 405-nm photons produce sufficiently large hot spot to trigger a single-photon response. The dependence of detection efficiency on bias current for 405-nm photons in NbC is similar to that for 3400-nm photons in NbN. In NbC, large diffusivity and downconversion time result in 1-D critical current suppression profile compared with the usual 2-D profile in NbN. | ||||
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Series Volume | Series Issue | Edition | |||
ISSN | 1051-8223 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1348 | |||
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Author | Lusche, R.; Semenov, A.; Korneeva, Y.; Trifonov, A.; Korneev, A.; Gol'tsman, G.; Hübers, H.-W. | ||||
Title | Effect of magnetic field on the photon detection in thin superconducting meander structures | Type | Journal Article | ||
Year | 2014 | Publication | Phys. Rev. B | Abbreviated Journal | Phys. Rev. B |
Volume | 89 | Issue | 10 | Pages | 104513 (1 to 7) |
Keywords | NbN SSPD, SNSPD | ||||
Abstract | We have studied the influence of an externally applied magnetic field on the photon and dark count rates of meander-type niobium nitride superconducting nanowire single-photon detectors. Measurements have been performed at a temperature of 4.2 K, and magnetic fields up to 250 mT have been applied perpendicularly to the meander plane. While photon count rates are field independent at weak applied fields, they show a strong dependence at fields starting from approximately ±25 mT. This behavior, as well as the magnetic field dependence of the dark count rates, is in good agreement with the recent theoretical model of vortex-assisted photon detection and spontaneous vortex crossing in narrow superconducting lines. However, the local reduction of the superconducting free energy due to photon absorption, which is the fitting parameter in the model, increases much slower with the photon energy than the model predicts. Furthermore, changes in the free-energy during photon counts and dark counts depend differently on the current that flows through the meander. This indicates that photon counts and dark counts occur in different parts of the meander. | ||||
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Series Volume | Series Issue | Edition | |||
ISSN | 1098-0121 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1367 | |||
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Author | Lusche, R.; Semenov, A.; Il'in, K.; Korneeva, Y.; Trifonov, A.; Korneev, A.; Hubers, H.; Siegel, M.; Gol'tsman, G. | ||||
Title | Effect of the wire width and magnetic field on the intrinsic detection efficiency of superconducting nanowire single-photon detectors | Type | Journal Article | ||
Year | 2013 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | IEEE Trans. Appl. Supercond. |
Volume | 23 | Issue | 3 | Pages | 2200205-2200205 |
Keywords | SSPD, SNSPD | ||||
Abstract | We present thorough measurements of the intrinsic detection efficiency in the wavelength range from 350 to 2500 nm for meander-type TaN and NbN superconducting nanowire single-photon detectors with different widths of the nanowire. The width varied from 70 nm to 130 nm. The open-beam configuration allowed us to accurately normalize measured spectra and to extract the intrinsic detection efficiency. For detectors from both materials the intrinsic detection efficiency at short wavelengths amounts at 100% and gradually decreases at wavelengths larger than the specific cut-off wavelengths, which decreases with the width of the nanowire. Furthermore, we show that applying weak magnetic fields perpendicular to the meander plane decreases the smallest detectable photon flux. | ||||
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Series Volume | Series Issue | Edition | |||
ISSN | 1051-8223 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1376 | |||
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Author | Sclafani, M.; Marksteiner, M.; Keir, F. M. L.; Divochiy, A.; Korneev, A.; Semenov, A.; Gol'tsman, G.; Arndt, M. | ||||
Title | Sensitivity of a superconducting nanowire detector for single ions at low energy | Type | Journal Article | ||
Year | 2012 | Publication | Nanotechnol. | Abbreviated Journal | Nanotechnol. |
Volume | 23 | Issue | 6 | Pages | 065501 (1 to 5) |
Keywords | NbN SSPD, SNSPD, superconducting single ion detector, SSID, SNSID | ||||
Abstract | We report on the characterization of a superconducting nanowire detector for ions at low kinetic energies. We measure the absolute single-particle detection efficiency eta and trace its increase with energy up to eta = 100%. We discuss the influence of noble gas adsorbates on the cryogenic surface and analyze their relevance for the detection of slow massive particles. We apply a recent model for the hot-spot formation to the incidence of atomic ions at energies between 0.2 and 1 keV. We suggest how the differences observed for photons and atoms or molecules can be related to the surface condition of the detector and we propose that the restoration of proper surface conditions may open a new avenue for SSPD-based optical spectroscopy on molecules and nanoparticles. | ||||
Address | Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna, Vienna, Austria | ||||
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Language | English | Summary Language | Original Title | ||
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Series Volume | Series Issue | Edition | |||
ISSN | 0957-4484 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | PMID:22248823 | Approved | no | ||
Call Number | Serial | 1380 | |||
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Author | Maingault, L.; Tarkhov, M.; Florya, I.; Semenov, A.; Espiau de Lamaëstre, R.; Cavalier, P.; Gol’tsman, G.; Poizat, J.-P.; Villégier, J.-C. | ||||
Title | Spectral dependency of superconducting single photon detectors | Type | Journal Article | ||
Year | 2010 | Publication | J. Appl. Phys. | Abbreviated Journal | J. Appl. Phys. |
Volume | 107 | Issue | 11 | Pages | 116103 (1 to 3) |
Keywords | NbN SSPD, SNSPD | ||||
Abstract | We investigate the effect of varying both incoming optical wavelength and width of NbN nanowires on the superconducting single photon detectors (SSPD) detection efficiency. The SSPD are current biased close to critical value and temperature fixed at 4.2 K, far from transition. The experimental results are found to verify with a good accuracy predictions based on the “hot spot model,” whose size scales with the absorbed photon energy. With larger optical power inducing multiphoton detection regime, the same scaling law remains valid, up to the three-photon regime. We demonstrate the validity of applying a limited number of measurements and using such a simple model to reasonably predict any SSPD behavior among a collection of nanowire device widths at different photon wavelengths. These results set the basis for designing efficient single photon detectors operating in the infrared (2–5 μm range). This work was supported by European projects FP6 STREP “SINPHONIA” (Contract No. NMP4-CT-2005-16433) and IP “QAP” (Contract No. 15848). |
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Series Volume | Series Issue | Edition | |||
ISSN | 0021-8979 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1392 | |||
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