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Yagoubov, P.; Kroug, M.; Merkel, H.; Kollberg, E.; Schubert, J.; Hubers, H. W.; Svechnikov, S.; Voronov, B.; Gol'tsman, G.; Wang, Z. |
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Hot electron bolometric mixers based on NbN films deposited on MgO substrates |
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1999 |
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Inst. Phys. Conf. Ser. |
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Inst. Phys. Conf. Ser. |
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167 |
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687-690 |
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Barcelona, Spain |
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4th Europ. Conf. on Appl. Superconductivity, Inst. Phys. Conf. Ser. |
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297 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Gogidze, I. G.; Semenov, A. D.; Sergeev, A. V. |
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Title |
Processes of electron-phonon interaction in thin YBaCuO films |
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Journal Article |
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1991 |
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Phys. C: Supercond. |
Abbreviated Journal |
Phys. C: Supercond. |
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185-189 |
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1371-1372 |
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YBCO HTS detectors |
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The ultrafast voltage response of YBaCuO films to laser radiation is studied and compared with previously investigated quasiparicles response to radiation of submillimeter wavelength range. Voltage shift under the visible light radiation has two components. Picosecond response realized as suppression superconductivity by nonequilibrium excess quasiparticles, response time is determined by quasiparticles recombination rate. Nanosecond response is probably due to bolometric effect. |
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0921-4534 |
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1676 |
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Semenov, A.; Haas, P.; Ilin, K.; Hubers, H.; Siegel, M.; Engel, A.; Smirnov, A. |
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Energy resolution and sensitivity of a superconducting quantum detector |
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Journal Article |
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2007 |
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Phys. C: Supercond. |
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Phys. C: Supercond. |
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460-462 |
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1491-1492 |
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0921-4534 |
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535 |
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Seki, T.; Shibata, H.; Takesue, H.; Tokura, Y.; Imoto, N. |
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Comparison of timing jitter between NbN superconducting single-photon detector and avalanche photodiode |
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2010 |
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Phys. C |
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Phys. C |
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470 |
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20 |
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1534-1537 |
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SSPD; APD; jitter |
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We report the pulse-to-pulse timing jitter measurement of a niobium nitride (NbN) superconducting single-photon detector (SSPD) and an InGaAs avalanche photodiode (APD) at 1550-nm wavelength. A direct comparison of their timing jitter was performed by using the same experimental configuration to measure both detectors. The measured jitter of the SSPD and the APD are 75 and 84 ps at full-width at half-maximum (FWHM), and 138 and 384 ps at full-width at tenth-maximum (FWTM), respectively. The jitter of the SSPD remains small at FWTM while that of APD is wide. We also estimated the transmission distances and secure key generation rates for fiber-based quantum key distribution (QKD) which uses these detectors. The estimated transmission distances of the APD are 86 km and 107 km with respect to 1 ns and 100 ps time windows, respectively, and those of the SSPD are 125 km and 172 km with respect to 1 ns and 100 ps time windows, respectively. This estimation indicates the SSPDЃfs advantages for QKD compared to the APD. |
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RPLAB @ akorneev @ |
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613 |
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Gol'tsman, G. N.; Kouminov, P.; Goghidze, I.; Gershenzon, E. M. |
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Nonequilibrium kinetic inductive response of YBaCuO thin films to low-power laser pulses |
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1994 |
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Phys. C: Supercond. |
Abbreviated Journal |
Phys. C: Supercond. |
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235-240 |
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1979-1980 |
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YBCO HTS KID |
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Transient non-equilibrium kinetic inductive voltage response of YBaCuO thin films to 20 ps pulses of YAG:Nd laser radiation with 0.63 μm and 1.5 μm wavelength has been revealed. By increasing the sensitivity of 100 ps resolution time registration system and diminishing light intensity (fluence 0.1-1 μJ2/cm2) and transport current (density j≤105 A/cm2) we observed a perculiar bipolar signal form with nearly equal amplitudes of each sign. The integration of the kinetic inductive response over time gives the result which is qualitatively of the same form as the response in the resistive and normal states: nonequilibrium picosecond scale component followed by bolometric nanosecond. Nonequilibrium response is interpreted as suppression of order parameter by excess of quasiparticles followed by a change in resistance in the resistive state and kinetic inductance in superconductive state. |
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0921-4534 |
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1634 |
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