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Smirnov K, Korneev A, Minaeva O, Divochij A, Rubtsova I, Antipov A, et al. Superconducting single-photon detector for near- and middle IR wavelength range. In: Proc. 16th Int. Crimean Microwave and Telecommunication Technology. Vol 2.; 2006. p. 684–5.
Abstract: Presented in this paper are the results of research of NbN-film superconducting single-photon detector. At 2 K temperature, quantum efficiency in the visible light (0.56 mum) reaches 30-40 %. With the wavelength increase quantum efficiency decreases and comes to 20% at 1.55 mum and 0.02% at 5.6 mum. Minimum dark counts rate is 2times10-4s-1. The jitter of detector is 35 ps. The detector was successfully implemented for integrated circuits non-invasive optical testing. It is also perspective for quantum cryptography systems
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Milostnaya I, Korneev A, Tarkhov M, Divochiy A, Minaeva O, Seleznev V, et al. Superconducting single photon nanowire detectors development for IR and THz applications. J Low Temp Phys. 2008;151(1-2):591–6.
Abstract: We present our progress in the development of superconducting single-photon detectors (SSPDs) based on meander-shaped nanowires made from few-nm-thick superconducting films. The SSPDs are operated at a temperature of 2–4.2 K (well below T c ) being biased with a current very close to the nanowire critical current at the operation temperature. To date, the material of choice for SSPDs is niobium nitride (NbN). Developed NbN SSPDs are capable of single photon counting in the range from VIS to mid-IR (up to 6 μm) with a record low dark counts rate and record-high counting rate. The use of a material with a low transition temperature should shift the detectors sensitivity towards longer wavelengths. We present state-of-the art NbN SSPDs as well as the results of our recent approach to expand the developed SSPD technology by the use of superconducting materials with lower T c , such as molybdenum rhenium (MoRe). MoRe SSPDs first were made and tested; a single photon response was obtained.
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Ryabchun S, Korneev A, Matvienko V, Smirnov K, Kouminov P, Seleznev V, et al. Superconducting single photon detectors array based on hot electron phenomena. In: Proc. 15th Int. Symp. Space Terahertz Technol.; 2004. p. 242–7.
Abstract: In this paper we propose to use time domain multiplexing for large format arrays of superconducting single photon detectors (SSPDs) of the terahertz, visible and infrared frequency ranges based on ultrathin superconducting NbN films. Effective realization of time domain multiplexing for SSPD arrays is possible due to a short electric pulse of the SSPD as response to radiation quantum absorption, picosecond jitter and extremely low noise equivalent power (NEP). We present experimental results of testing 2×2 arrays in the infrared waveband. The measured noise equivalent power in the infrared and expected for the terahertz waveband is 10 – 21 WHz -1/2 . The best quantum efficiency (QE) of SSPD is 50% at 1.3 µm wavelength.
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Ryabchun S, Smirnov A, Pentin I, Vakhtomin Y, Smirnov K, Kaurova N, et al. Superconducting single photon detector integrated with optical cavity. In: Proc. MLPLIT. Modern laser physics and laser-information technologies for science and manufacture; 2011. p. 143–5.
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Semenov AD, Hübers H-W, Gol’tsman GN, Smirnov K. Superconducting quantum detector for astronomy and X-ray spectroscopy. In: Pekola J, Ruggiero B, Silvestrini P, editors. Proc. Int. Workshop on Supercond. Nano-Electronics Devices. : Springer; 2002. p. 201–10.
Abstract: We propose the novel concept of ultra-sensitive energy-dispersive superconducting quantum detectors prospective for applications in astronomy and X-ray spectroscopy. Depending on the superconducting material and operation conditions, such detector may allow realizing background limited noise equivalent power 10−21 W Hz−1/2 in the terahertz range when exposed to 4-K background radiation or counting of 6-keV photon with almost 10—4 energy resolution. Planar layout and relatively simple technology favor integration of elementary detectors into a detector array.
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Korneev A, Divochiy A, Marsili F, Bitauld D, Fiore A, Seleznev V, et al. Superconducting photon number resolving counter for near infrared applications. In: Tománek P, Senderáková D, Hrabovský M, editors. Proc. SPIE. Vol 7138. Spie; 2008. 713828 (1 to 5).
Abstract: We present a novel concept of photon number resolving detector based on 120-nm-wide superconducting stripes made of 4-nm-thick NbN film and connected in parallel (PNR-SSPD). The detector consisting of 5 strips demonstrate a capability to resolve up to 4 photons absorbed simultaneously with the single-photon quantum efficiency of 2.5% and negligibly low dark count rate.
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Korneev A, Divochiy A, Tarkhov M, Minaeva O, Seleznev V, Kaurova N, et al. Superconducting NbN-nanowire single-photon detectors capable of photon number resolving. In: Supercond. News Forum.; 2008.
Abstract: We present our latest generation of ultra-fast superconducting NbN single-photon detectors (SSPD) capable of photon-number resolving (PNR). The novel SSPDs combine 10 μm x 10 μm active area with low kinetic inductance and PNR capability. That resulted in significantly reduced photoresponse pulse duration, allowing for GHz counting rates. The detector’s response magnitude is directly proportional to the number of incident photons, which makes this feature easy to use. We present experimental data on the performance of the PNR SSPDs. These detectors are perfectly suited for fibreless free-space telecommunications, as well as for ultra-fast quantum cryptography and quantum computing.
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Verevkin A, Xu Y, Zheng X, Williams C, Sobolewski R, Okunev O, et al. Superconducting NbN-based ultrafast hot-electron single-photon detector for infrared range. In: Proc. 12th Int. Symp. Space Terahertz Technol.; 2001. p. 462–8.
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Chulkova G, Milostnaya I, Korneev A, Minaeva O, Rubtsova I, Voronov B, et al. Superconducting nanostructures for counting of single photons in the infrared range. In: Proc. 2-nd CAOL. Vol 2.; 2005. p. 100–3.
Abstract: We present our studies on ultrafast superconducting single-photon detectors (SSPDs) based on ultrathin NbN nanostructures. Our SSPDs are patterned by electron beam lithography from 4-nm thick NbN film into meander-shaped strips covering square area of 10/spl times/10 /spl mu/m/sup 2/. The advances in the fabrication technology allowed us to produce highly uniform 100-120-nm-wide strips with meander filling factor close to 0.6. The detectors exploit a combined detection mechanism, where upon a single-photon absorption, an avalanche of excited hot electrons and the biasing supercurrent, jointly produce a picosecond voltage transient response across the superconducting nanostrip. The SSPDs are typically operated at 4.2 K, but they have shown that their sensitivity in the infrared radiation range can be significantly improved by lowering the operating temperature from 4.2 K to 2 K. When operated at 2 K, the SSPD quantum efficiency (QE) for visible light photons reaches 30-40%, which is the saturation value limited by optical absorption of our 4-nm-thick NbN film. For 1.55 /spl mu/m photons, QE was /spl sim/20% and decreases exponentially with the increase of the optical wavelength, but even at the wavelength of 6 /spl mu/m the detector remains sensitive to single photons and exhibits QE of about 10/sup -2/%. The dark (false) count rate at 2 K is as low as 2 /spl times/ 10/sup -4/ s/sup -1/, what makes our detector essentially a background-limited sensor. The very low dark-count rate results in the noise equivalent power (NEP) as low as 10/sup -18/ WHz/sup -1/2/ for the mid-infrared range (6 /spl mu/m). Further improvement of the SSPD performance in the mid-infrared range can be obtained by substituting NbN for the other, lower-T/sub c/ superconductors with the narrow superconducting gap and low quasiparticle diffusivity. The use of such materials will shift the cutoff wavelength towards the values even longer than 6 /spl mu/m.
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Gol'tsman G, Korneev A, Minaeva O, Rubtsova I, Milostnaya I, Chulkova G, et al. Superconducting nanostructured detectors capable of single-photon counting in the THz range. In: Proc. 16th Int. Symp. Space Terahertz Technol.; 2005. p. 555–7.
Abstract: We present the results of the NbN superconducting single-photon detector sensitivity measurement in the visible to mid-IR range. For visible and near IR light (0.56 — 1.3μm wavelengths) the detector exhibits 30% quantum efficiency saturation value limited by the NbN film absorption and extremely low level of dark counts (2x10 -4 s -1). The detector manifested single-photon counting up to 6 μm wavelength with the quantum efficiency reaching 10 -2 % at 5.6 μm and 3 K temperature.
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