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Korneev A, Semenov A, Vodolazov D, Gol’tsman GN, Sobolewski R. Physics and operation of superconducting single-photon devices. In: Wördenweber R, Moshchalkov V, Bending S, Tafuri F, editors. Superconductors at the Nanoscale. De Gruyter; 2017. p. 279–308.
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Zhang J, Verevkin A, Slysz W, Chulkova G, Korneev A, Lipatov A, et al. Time-resolved characterization of NbN superconducting single-photon optical detectors. In: Armitage JC, editor. Proc. SPIE. Vol 10313. SPIE; 2017. 103130F (1 to 3).
Abstract: NbN superconducting single-photon detectors (SSPDs) are very promising devices for their picosecond response time, high intrinsic quantum efficiency, and high signal-to-noise ratio within the radiation wavelength from ultraviolet to near infrared (0.4 gm to 3 gm) [1-3]. The single photon counting property of NbN SSPDs have been investigated thoroughly and a model of hotspot formation has been introduced to explain the physics of the photon- counting mechanism [4-6]. At high incident flux density (many-photon pulses), there are, of course, a large number of hotspots simultaneously formed in the superconducting stripe. If these hotspots overlap with each other across the width w of the stripe, a resistive barrier is formed instantly and a voltage signal can be generated. We assume here that the stripe thickness d is less than the electron diffusion length, so the hotspot region can be considered uniform. On the other hand, when the photon flux is so low that on average only one hotspot is formed across w at a given time, the formation of the resistive barrier will be realized only when the supercurrent at sidewalks surpasses the critical current (jr) of the superconducting stripe [1]. In the latter situation, the formation of the resistive barrier is associated with the phase-slip center (PSC) development. The effect of PSCs on the suppression of superconductivity in nanowires has been discussed very recently [8, 9] and is the subject of great interest.
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Komrakova S, Javadzade J, Vorobyov V, Bolshedvorskii S, Soshenko V, Akimov A, et al. On-chip controlled placement of nanodiamonds with a nitrogen-vacancy color centers (NV). In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051046 (1 to 4).
Abstract: Here we studied the fabrication technique of a kilopixel array of nanodiamonds with a nitrogen-vacancy color centers (NV) on top of the chip and measured the second-order correlation function deep, clearly demonstrated the presence of single-photon sources. The controlled position of nanodiamonds, determined from the measurement of second-order correlation fiction, was realize, as well as the yield of optimized technique equals 12.5% is shown.
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An P, Kovalyuk V, Golikov A, Zubkova E, Ferrari S, Korneev A, et al. Experimental optimisation of O-ring resonator Q-factor for on-chip spontaneous four wave mixing. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051047.
Abstract: In this paper we experimentally studied the influence of geometrical parameters of the planar O-ring resonators on its Q-factor and losses. We systematically changed the gap between the bus waveguide and the ring, as well as the width of the ring. We found the highest Q = 5×105 for gap 2.0 μm and the ring width 2 μm. This work is important for further on-chip SFWM applications since the generation rate of the biphoton field strongly depends on the quality factor as Q3
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Golikov A, Kovalyuk V, An P, Zubkova E, Ferrari S, Pernice W, et al. Silicon nitride nanophotonic circuit for on-chip spontaneous four-wave mixing. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051051.
Abstract: Here we present an integrated nanophotonic circuit for on-chip spontaneous four-wave mixing. The fabricated device includes an O-ring resonator, a Bragg noch-filter as well as a nine-channel arrayed waveguide gratings (AWG) operated in the C-band wavelength range (1550 nm). The measured optical losses of the device (-6.8 dB) as well as a high Q-factor (> 1.2×105) shows a good potential for realizing the spontaneous four-wave mixing on the silicon nitride chip.
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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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Korneev A, Kovalyuk V, An P, Golikov A, Zubkova E, Ferrari S, et al. Superconducting single-photon detector for integrated waveguide spectrometer. In: EPJ Web Conf. Vol 190.; 2018. 04009.
Abstract: We present our recent achievements in the development of an on-chip spectrometer consisting of arrayed waveguide grating made of Si3N4 waveguides and NbN superconducting single-photon detector.
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