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Smirnov E, Golikov A, Zolotov P, Kovalyuk V, Lobino M, Voronov B, et al. Superconducting nanowire single-photon detector on lithium niobate. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051025.
Abstract: We demonstrate superconducting niobium nitride nanowires folded on top of lithium niobate substrate. We report of 6% system detection efficiency at 20 s−1 dark count rate at telecommunication wavelength (1550 nm). Our results shown great potential for the use of NbN nanowires in the field of linear and nonlinear integrated quantum photonics.
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Zubkova E, An P, Kovalyuk V, Korneev A, Ferrari S, Pernice W, et al. Optimization of contra-directional coupler based on silicon nitride Bragg rib waveguide. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051048.
Abstract: We report on the development and fabrication of a contra-directional coupler based on the Bragg waveguide on Si3N4 platform. Transmitted and reflected by the contra-directional coupler spectra were measured. The reflected spectra exactly matches the one notched by the main channel of the coupler. Losses are about 3dB, coupling to the directing branch of the coupler is practically lossless. FWHM of the transmitted (reflected) spectra is 3.46 nm.
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Prokhodtsov A, An P, Kovalyuk V, Zubkova E, Golikov A, Korneev A, et al. Optimization of on-chip photonic delay lines for telecom wavelengths. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051052.
Abstract: In this work, we experimentally studied optical delay lines on silicon nitride platform for telecomm wavelength (1550 nm). We modeled the group delay time and fabricated spiral optical delay lines with different waveguide widths and radii as well as measured their transmission. For the half etched rib waveguides we achieved the losses in the range of 3 dB/cm.
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Kovalyuk V, Kahl O, Ferrari S, Vetter A, Lewes-Malandrakis G, Nebel C, et al. On-chip single-photon spectrometer for visible and infrared wavelength range. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051045.
Abstract: Here we show our latest progress in the field of a single-photon spectrometer for the visible and infrared wavelengths ranges implementation. We consider three different on-chip approaches: a coherent spectrometer with a low power of the heterodyne, a coherent spectrometer with a high power of the heterodyne, and an eight-channel single-photon spectrometer for direct detection. Along with high efficiency, spectrometers show high detection efficiency and temporal resolution through the use of waveguide integrated superconducting nanowire single-photon detectors.
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Moshkova M, Morozov P, Divochiy A, Vakhtomin Y, Smirnov K. Large active area superconducting single photon detector. In: J. Phys.: Conf. Ser. Vol 1410.; 2019. 012139.
Abstract: We present development of large active area superconducting single-photon detectors well coupled with standard 50 μm-core multi-mode fiber. The sensitive area of the SSPD is patterned using the photon-number-resolving design and occupies an area of 40×40 μm2. Using this approach, we have obtained excellent specifications: system detection efficiency of 47% measured using a 900 nm laser and low dark count rate of 100 cps. The main advantages of the approach presented are a very short dead time of the detector of 22 ns and FWHM jitter value of about 130 ps.
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Zolotov PI, Divochiy AV, Vakhtomin YB, Lubenchenko AV, Morozov PV, Shurkaeva IV, et al. Influence of sputtering parameters on the main characteristics of ultra-thin vanadium nitride films. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051030.
Abstract: We researched the relation between deposition and ultra-thin VN films parameters. To conduct the experimental study we varied substrate temperature, Ar and N2 partial pressures and deposition rate. The study allowed us to obtain the films with close to the bulk values transition temperatures and implement such samples in order to fabricate superconducting single-photon detectors.
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Romanov NR, Zolotov PI, Vakhtomin YB, Divochiy AV, Smirnov KV. Electron diffusivity measurements of VN superconducting single-photon detectors. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051032.
Abstract: The research of ultrathin vanadium nitride (VN) films as a promising candidate for superconducting single-photon detectors (SSPD) is presented. The electron diffusivity measurements are performed for such devices. Devices that were fabricated out from 9.9 nm films had diffusivity coefficient of 0.41 cm2/s and from 5.4 nm – 0.54 cm2/s. Obtained values are similar to other typical SSPD materials. The diffusivity that increases along with decreasing of the film thickness is expected to allow fabrication of the devices with improved characteristics. Fabricated VN SSPDs showed prominent single-photon response in the range 0.9-1.55 µm.
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Zolotov PI, Divochiy AV, Vakhtomin YB, Morozov PV, Seleznev VA, Smirnov KV. Development of high-effective superconducting single-photon detectors aimed for mid-IR spectrum range. In: J. Phys.: Conf. Ser. Vol 917.; 2017. 062037.
Abstract: We report on development of superconducting single-photon detectors (SSPD) with high intrinsic quantum efficiency in the wavelength range 1.31 – 3.3 μm. By optimization of the NbN film thickness and its compound, we managed to improve detection efficiency of the detectors in the range up to 3.3 μm. Optimized devices showed intrinsic quantum efficiencies as high as 10% at mid-IR range.
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Simonov NO, Korneeva YP, Korneev AA, Goltsman GN. Enhance of the superconducting properties of the NbN/Au bilayer bridges. In: J. Phys.: Conf. Ser. Vol 1695.; 2020. 012132 (1 to 4).
Abstract: We experimentally demonstrate strong temperature dependence of the critical current of the superconducting 600-nm-wide and 5-μm-long bridge made of NbN/Au bilayer. The result is achieved due to the proximity effect realized between the highly disordered superconducting NbN layer and low resistive normal-metal Au layer.
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Elezov MS, Shcherbatenko ML, Sych DV, Goltsman GN. Development of control method for an optimal quantum receiver. In: J. Phys.: Conf. Ser. Vol 1695.; 2020. 012126.
Abstract: We propose a method for optimal displacement controlling of an optimal quantum receiver for registrations a binary coherent signal. An optimal receiver is able to distinguish between two phase-modulated states of a coherent signal. The optimal receiver controlling method can be used later in practice in various physical implementations of the optimal receiver.
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