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Your search keyword '"Kuzmin, Leonid S."' showing total 94 results
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94 results on '"Kuzmin, Leonid S."'

1. Single-photon detection with a Josephson junction coupled to a resonator

Author

Golubev, Dmitry S., Ilichev, Evgeni V., and Kuzmin, Leonid S.

Subjects
Condensed Matter - Superconductivity, Quantum Physics
Abstract

We use semiclassical formalism to optimize a microwave single photon detector based on switching events of a current biased Josephson junction coupled to a resonator. In order to detect very rare events, the average time between dark counts $\tau_{\rm dark}$ should be maximized taking into account that the switching time $\tau_{\rm sw}$ should be sufficiently small. We demonstrate that these times can be tuned in the wide range by changing the junction parameters, and the ratios $\tau_{\rm dark}/\tau_{\rm sw} \sim 10^9$ can be achieved. Therefore, a junction-resonator arrangement can be used for detecting extremely low photon fluxes, for instance for searching galactic axions., Comment: 11 pages, 3 figures

Published
2021
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2. Cold-electron bolometers for future mm and sub-mm sky surveys

Author

Salatino, Maria, de Bernardis, Paolo, Mahashabde, Sumedh, Kuzmin, Leonid S., and Masi, Silvia

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

Future sky surveys in the mm/sub-mm range, like the forthcoming balloon-borne missions LSPE, OLIMPO, SPIDER etc., will need detectors insensitive to cosmic rays (CRs) and with a NEP of the order of $10^{-17} \div 10^{-18}\,$W/sqrt(Hz). The Cold-Electron Bolometers (CEBs) technology is promising, having the required properties, since the absorber volume is extremely small and the electron system of the absorber is thermally insulated from the phonon system. We have developed an experimental setup to test the optical performance and the CRs insensitivity of CEBs, with the target of integrating them in the OLIMPO and LSPE focal planes., Comment: 6 figures

Published
2014
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3. Soliton scattering as a measurement tool for weak signals

Author

Soloviev, Igor I., Klenov, Nikolay V., Pankratov, Andrey L., Revin, Leonid S., Il'ichev, Evgeniy, and Kuzmin, Leonid S.

Subjects
Condensed Matter - Superconductivity
Abstract

We have considered relativistic soliton dynamics governed by the sine-Gordon equation and affected by short spatial inhomogeneities of the driving force and thermal noise. Developed analytical and numerical methods for calculation of soliton scattering at the inhomogeneities allowed us to examine the scattering as a measurement tool for sensitive detection of polarity of the inhomogeneities. We have considered the superconducting fluxonic ballistic detector as an example of the device in which the soliton scattering is utilized for quantum measurements of superconducting flux qubit. We optimized the soliton dynamics for the measurement process varying the starting and the stationary soliton velocity as well as configuration of the inhomogeneities. For experimentally relevant parameters we obtained the signal-to-noise ratio above 100 reflecting good practical usability of the measurement concept., Comment: 9 pages, 5 figures

Published
2014
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4. Dephasing of Cooper pairs and subgap electron transport in superconducting hybrids

Author

Semenov, Andrew G., Zaikin, Andrei D., and Kuzmin, Leonid S.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity
Abstract

We argue that electron-electron interactions fundamentally restrict the penetration length of Cooper pairs into a diffusive normal metal (N) from a superconductor (S). At low temperatures this Cooper pair dephasing length $L_\varphi$ remains finite and does not diverge at $T \to 0$. We evaluate the subgap conductance of NS hybrids in the presence of electron-electron interactions and demonstrate that this new length $L_\varphi$ can be directly extracted from conductance measurements in such structures., Comment: 5 pages, 4 figures

Published
2012
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5. Theory of a large thermoeffect in superconductors doped with magnetic impurities

Author

Kalenkov, Mikhail S., Zaikin, Andrei D., and Kuzmin, Leonid S.

Subjects
Condensed Matter - Superconductivity
Abstract

We argue that parametrically strong enhancement of a thermoelectric current can be observed in conventional superconductors doped by magnetic impurities. This effect is caused by violation of the symmetry between electron-like and hole-like excitations due to formation of subgap Andreev bound states in the vicinity of magnetic impurities. We develop a quantitative theory of this effect and demonstrate that it can be detected in modern experiments., Comment: 5 pages, 4 figures

Published
2012
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6. Drastically suppressing the error of ballistic readout of qubits

Author

Pankratov, Andrey L., Gordeeva, Anna V., and Kuzmin, Leonid S.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Disordered Systems and Neural Networks, Physics - Computational Physics, Physics - Data Analysis, Statistics and Probability
Abstract

The thermal jitter of transmission of magnetic flux quanta in long Josephson junctions is studied. While for large-to-critical damping and small values of bias current the physically obvious dependence of the jitter versus length $\sigma\sim\sqrt{L}$ is confirmed, for small damping starting from the experimentally relevant $\alpha=0.03$ and below strong deviation from $\sigma\sim\sqrt{L}$ is observed, up to nearly complete independence of the jitter versus length, which is exciting from fundamental point of view, but also intriguing from the point of view of possible applications., Comment: 4 pages, 6 figures

Published
2011
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7. Measurements of dichroic bow-tie antenna arrays with integrated cold-electron bolometers using YBCO oscillators

Author

Revin, Leonid S, primary, Pimanov, Dmitry A, additional, Chiginev, Alexander V, additional, Blagodatkin, Anton V, additional, Zbrozhek, Viktor O, additional, Samartsev, Andrey V, additional, Orlova, Anastasia N, additional, Masterov, Dmitry V, additional, Parafin, Alexey E, additional, Safonova, Victoria Yu, additional, Gordeeva, Anna V, additional, Pankratov, Andrey L, additional, Kuzmin, Leonid S, additional, Sidorenko, Anatolie S, additional, Masi, Silvia, additional, and de Bernardis, Paolo, additional

Published
2024
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13. Spectral Characteristics of the Double-Folded Slot Antennas with Cold-Electron Bolometers for the 220/240 GHz Channels of the LSPE Instrument

Author

Revin, Leonid S., primary, Pimanov, Dmitry A., additional, Blagodatkin, Anton V., additional, Gordeeva, Anna V., additional, Pankratov, Andrey L., additional, Chiginev, Alexander V., additional, Rakut’, Igor V., additional, Zbrozhek, Viktor O., additional, Kuzmin, Leonid S., additional, Masi, Silvia, additional, and de Bernardis, Paolo, additional

Published
2021
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40. Finline-integrated cold electron bolometer

Author

Otto, Ernst, primary, Tarasov, Mikhail, additional, Grimes, Paul K., additional, Kaurova, Natalia S., additional, Kuusisto, Hannes, additional, Kuzmin, Leonid S., additional, and Yassin, Ghassan, additional

Published
2010
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44. Submillimeter and millimeter wave sky mapping in the space project submillimetron.

Author

Gromov, Vladimir D., Kardashev, Nikolay S., and Kuzmin, Leonid S.

Subjects
SUBMILLIMETER astronomy, SPACE probes
Abstract

Submillimetron is an international project of the space telescope for astronomical studies at submillimeter and millimeter wavelengths using free-flying spacecraft and facilities of the Russian segment of the International Space Station. The payload is the 60-cm telescope cooled to liquid helium temperature with arrays of a novel type detector, Normal-metal Hot-Electron Bolometer (NHEB). The angular resolution is 1–10 arcmin, field of view-about 1 degree, detectors sensitivity-about 10[sup -18] W/Hz[sup 1/2], spectral region -0.2–2 mm. Parameters of the instrument and complementarity to other experiments including CMB measurements are discussed. © 2002 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2002

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