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Author Bell, M.; Sergeev, A.; Mitin, V.; Bird, J.; Verevkin, A.; Gol'tsman, G.
Title One-dimensional resistive states in quasi-two-dimensional superconductors Type Journal Article
Year 2007 Publication arXiv:0709.0709v1 [cond-mat.supr-con] Abbreviated Journal
Volume Issue Pages 1-11
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Abstract We investigate competition between one- and two-dimensional topological excitations – phase slips and vortices – in formation of resistive states in quasi-two-dimensional superconductors in a wide temperature range below the mean-field transition temperature T(C0). The widths w = 100 nm of our ultrathin NbN samples is substantially larger than the Ginzburg-Landau coherence length ξ = 4nm and the fluctuation resistivity above T(C0) has a two-dimensional character. However, our data shows that the resistivity below T(C0) is produced by one-dimensional excitations, – thermally activated phase slip strips (PSSs) overlapping the sample cross-section. We also determine the scaling phase diagram, which shows that even in wider samples the PSS contribution dominates over vortices in a substantial region of current/temperature variations. Measuring the resistivity within seven orders of magnitude, we find that the quantum phase slips can only be essential below this level.
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Call Number (down) RPLAB @ atomics90 @ Serial 948
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Author Gao, J. R.; Hajenius, M.; Yang, Z. Q.; Baselmans, J. J. A.; Khosropanah, P.; Barends, R.; Klapwijk, T. M.
Title Terahertz superconducting hot electron bolometer heterodyne receivers Type Journal Article
Year 2007 Publication IEEE Trans. Appl. Supercond. Abbreviated Journal
Volume 17 Issue 2 Pages 252-258
Keywords HEB, mixer, direct detection effect
Abstract We highlight the progress on NbN hot electron bolometer (HEB) mixers achieved through fruitful collaboration between SRON Netherlands Institute for Space Research and Delft University of Technology, the Netherlands. This includes the best receiver noise temperatures of 700 K at 1.63 THz using a twin-slot antenna mixer and 1050 K at 2.84 THz using a spiral antenna coupled HEB mixer. The mixers are based on thin NbN films on Si and fabricated with a new contact-process and-structure. By reducing their areas HEB mixers have shown an LO power requirement as low as 30 nW. Those small HEB mixers have demonstrated equivalent sensitivity as those with large areas provided the direct detection effect due to broadband radiation is removed. To manifest that a HEB based heterodyne receiver can in practice be used at arbitrary frequencies above 2 THz, we demonstrate a 2.8 THz receiver using a THz quantum cascade laser (QCL) as local oscillator.
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ISSN 1051-8223 ISBN Medium
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Call Number (down) RPLAB @ asmirn @ Serial 557
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Author Takesue, Hiroki; Nam, Sae Woo; Zhang, Qiang; Hadfield, Robert H.; Honjo, Toshimori; Tamaki, Kiyoshi; Yamamoto, Yoshihisa
Title Quantum key distribution over a 40-dB channel loss using superconducting single-photon detectors Type Journal Article
Year 2007 Publication Nature Photonics Abbreviated Journal Nat. Photon.
Volume 1 Issue Pages 343-348
Keywords quantum cryptography, SSPD, QKD, DSP
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Call Number (down) RPLAB @ akorneev @ Serial 609
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Author Finkel, M. I.; Maslennikov, S. N.; Gol'tsman, G. N.
Title The concept of the receiving complex for the “Millimetron” space radio telescope Type Journal Article
Year 2007 Publication Radiophys. Quant. Electron. Abbreviated Journal Radiophys. Quant. Electron.
Volume 50 Issue 10-11 Pages 837-846
Keywords HEB, applications, Millimetron, VLBI
Abstract We consider the current status of research in the development of a submillimeter and far-infrared receiving instrument and propose promising solutions for the receivers of the spaceborne telescope “Millimetron,” which allow one to realize comprehensively the opportunities given by this international project administrated by the Astrospace Center of the P. N. Lebedev Physical Institute of the Russian Academy of Sciences.
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ISSN 0033-8443 ISBN Medium
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Call Number (down) Serial 411
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Author Semenov, A.; Haas, P.; Ilin, K.; Hubers, H.; Siegel, M.; Engel, A.; Smirnov, A.
Title Energy resolution and sensitivity of a superconducting quantum detector Type Journal Article
Year 2007 Publication Phys. C: Supercond. Abbreviated Journal Phys. C: Supercond.
Volume 460-462 Issue Pages 1491-1492
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ISSN 0921-4534 ISBN Medium
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Notes Approved no
Call Number (down) Serial 535
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