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Author Казаков, А. Ю.; Кардакова, А. И.; Селиверстов, С. В.; Горшков, К. Н.; Дивочий, А. В.; Финкель, М. И.; Корнеев, А. А.; Вахтомин, Ю. Б. url  openurl
  Title Возможность применения сверхпроводниковых материалов в качестве отражающего покрытия холодного зеркала телескопа субмиллиметрового диапазона Type Journal Article
  Year 2012 Publication Совр. проб. науки и обр. Abbreviated Journal Совр. проб. науки и обр.  
  Volume Issue 3 Pages 1-5  
  Keywords radio telescope, superconducting coating  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) russian Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2070-7428 ISBN Medium  
  Area Expedition Conference  
  Notes УДК 520.272.2 Approved no  
  Call Number RPLAB @ sasha @ казаковвозможность Serial 1030  
Permanent link to this record
 
 
Author Семенов, А. В.; Корнеев, А. А.; Лобанов, Ю. В.; Корнеева, Ю. П.; Рябчун, С. А.; Лаврова, О. С.; Третьяков, И. В.; Флоря, И. Н.; Силаев, М. А.; Кинев, Н. В.; Ковалюк, В. В.; Смирнов, К. В.; Гольцман, Г. Н. url  openurl
  Title Поляризация электромагнитной волны вблизи фокуса зеркала и системы зеркал в субтерагерцовом диапазоне частот Type Journal Article
  Year 2012 Publication Современные проблемы науки и образования Abbreviated Journal  
  Volume Issue 2 Pages  
  Keywords sub-terahertz radio telescope  
  Abstract Рассмотрено влияние оптической системы телескопа на поляризацию принимаемого электромагнитного сигнала. Описано изменение поляризации луча при отражении от произвольно ориентированной поверхности зеркала. Учтены искажения поляризации, обусловленные как отклонением лучей от первоначального направления, так и различием в коэффициентах отражения для разных поляризаций в случае неидеального отражения. В рамках метода Френеля получены оценочные формулы, дающие отношение амплитуд поля с исходной поляризацией и с поляризацией, перпендикулярной исходной, вблизи фокальной точки оптической системы. Формулы выведены для нескольких практически важных случаев, в том числе для параболического зеркала и системы двух зеркал. Оценена верхняя граница поляризационных искажений в пределах кружка Эйри. Полученные оценки согласуются с результатами численного расчёта для двухзеркального радиотелескопа субтерагерцового диапазона.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Russian Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes 9 страниц; УДК 535-47 Approved no  
  Call Number Serial 1819  
Permanent link to this record
 
 
Author Казаков, А. Ю.; Селиверстов, С. В.; Дивочий, А. В.; Смирнов, К. В.; Финкель, М. И.; Вахтомин, Ю. Б. url  openurl
  Title Возможность применения сверхпроводниковых материалов в качестве отражающего покрытия зеркала телескопа, предназначенного для наблюдений анизотропии реликтового излучения Type Journal Article
  Year 2012 Publication Преподаватель ХХI век Abbreviated Journal  
  Volume Issue 3 Pages 221-224  
  Keywords submillimeter radio telescope  
  Abstract В статье исследуется возможность использования сверхпроводящего материала в качестве отражающего слоя зеркала субмиллиметрового телескопа, охлажденного до криогенных температур и предназначенного для наблюдений реликтового излучения. Для нескольких сверхпроводниковых материалов вычислен диапазон частот, в котором флуктуации теплового излучения покрытия меньше флуктуаций источника. Показана перспективность применения покрытия из Nb3Ge.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Russian Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1820  
Permanent link to this record
 
 
Author Семенов, А. В.; Корнеев, А. А.; Лобанов, Ю. В.; Корнеева, Ю. П.; Рябчун, С. А.; Третьяков, И. В.; Флоря, И. Н.; Смирнов, А. В.; Ковалюк, В. В.; Смирнов, К. В.; Гольцман, Г. Н. url  openurl
  Title Оценка поляризационных искажений, вносимых оптической системой радиотелескопа миллиметрового диапазона Type Journal Article
  Year 2012 Publication Преподаватель ХХI век Abbreviated Journal  
  Volume Issue 4 Pages 230-236  
  Keywords millimeter radio telescope  
  Abstract В статье рассмотрена поляризация электромагнитного поля вблизи фокальной точки телескопической системы. Оценена верхняя граница поляризационных искажений, вносимых отражающими поверхностями, в том числе с учетом неидеальности отражения.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Russian Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1821  
Permanent link to this record
 
 
Author Семенов, А. В.; Корнеев, А. А.; Смирнов, А. В.; Смирнов, К. В.; Ожегов, Р. В.; Окунев, О. В.; Гольцман, Г. Н.; Девятов, И. А. url  openurl
  Title Линейные по мощности поглощаемого излучения поправки к спектральным функциям «грязного» сверхпроводника и отклик сверхпроводниковых детекторов Type Journal Article
  Year 2012 Publication Преподаватель ХХI век Abbreviated Journal  
  Volume Issue 3 Pages 216-220  
  Keywords dirty superconductor film  
  Abstract В статье развит метод расчета малых поправок к спектральным функциям пленки «грязного» сверхпроводника, возникающих под действием поглощаемой мощности электромагнитного излучения. Метод пригоден в случае спектральных функций произвольного вида, что позволяет применять его для расчета отклика сверхпроводниковых детекторов излучения различного типа.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Russian Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1822  
Permanent link to this record
 
 
Author Корнеева, Ю. П.; Трифонов, А. В.; Вахтомин, Ю. Б.; Смирнов, К. В.; Корнеев, А. А.; Рябчун, С. А.; Третьяков, И. В.; Гольцман, Г. Н. url  openurl
  Title Расчет согласующего оптического резонатора для сверхпроводникового нанополоскового детектора Type Journal Article
  Year 2012 Publication Преподаватель ХХI век Abbreviated Journal  
  Volume Issue 3 Pages 225-227  
  Keywords SSPD, SNSPD  
  Abstract В статье произведен расчет резонатора, предназначенного для согласования сверхпроводникового нанополоскового однофотонного детектора с оптическим сигналом. Показано, что для детектора, выполненного из пленки с типичным сопротивлением квадрата 500 Ом и коэффициентом заполнения 0.5 коэффициент согласования с излучением, поляризованным параллельно полоскам детектора, достигает величины около 60%.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Russian Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1823  
Permanent link to this record
 
 
Author Semenov, A. V.; Devyatov, I. A.; Korneev, A. A.; Smirnov, K. V.; Goltsman, G. N.; Melnikov, A. P. url  openurl
  Title Derivation of expression for thermodynamic potential of “dirty” superconductor Type Journal Article
  Year 2012 Publication Rus. J. Radio Electron. Abbreviated Journal Rus. J. Radio Electron.  
  Volume Issue 4 Pages  
  Keywords dirty superconductor, Usadel theory, thermodynamic potential  
  Abstract We derive a formula for thermodynamic potential of dirty superconductor which express it via isotropic quasiclassical Green functions of Usadel theory. Our result allows unify description of dynamic processes and fluctuations in superconducting nano-electronic devices.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Russian Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes 7 pages Approved no  
  Call Number Serial 1824  
Permanent link to this record
 
 
Author Смирнов, А. В.; Карманцов, М. С.; Смирнов, К. В.; Вахтомин, Ю. Б.; Мастеров, Д. В.; Тархов, М. А.; Павлов, С. А.; Парафин, А. Е. url  openurl
  Title Терагерцовый отклик болометров на основе тонких пленок YBCO Type Journal Article
  Year 2012 Publication ЖТФ Abbreviated Journal ЖТФ  
  Volume 82 Issue 12 Pages 108-111  
  Keywords YBCO HEB NEP  
  Abstract Представлены первые результаты измерения болометрического отклика высокотемпературных сверхпроводниковых детекторов на основе тонких пленок YBCO на электромагнитное излучение с частотой 2.5 THz. Минимальное значение оптической мощности, эквивалентной шуму созданных детекторов, составило 3.5· 10-9 W/sqrt(Hz)sqrt. Обсуждена возможность дальнейшего увеличения чувствительности исследуемых детекторов.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Russian Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1825  
Permanent link to this record
 
 
Author Чулкова, Галина Меркурьевна; Семёнов, Александр Владимирович; Тархов, Михаил Александрович; Гольцман, Григорий Наумович; Корнеев, Александр Александрович; Смирнов, Константин Владимирович url  openurl
  Title О возможности использования PNR-SNPD в системах телекоммуникационной связи Type Journal Article
  Year 2012 Publication Преподаватель ХХI век Abbreviated Journal  
  Volume Issue 2 Pages 244-246  
  Keywords PNR SSPD, SNSPD, SNPD  
  Abstract Рассмотрена возможность применения сверхпроводникового нанополоскового детектора, разрешающего число фотонов (Photon-Number Resolving Superconducting Nanowire Photon Detector, PNR-SNPD), в качестве датчика приёмных модулей телекоммуникационных линий. Оценена мощность оптического импульса, необходимая для достижения приемлемо низкой доли ошибочных битов.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Russian Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1826  
Permanent link to this record
 
 
Author Henrich, D.; Dorner,S.; Hofherr, M.; Il'in, K.; Semenov, A.; Heintze, E.; Scheffler, M.; Dressel, M.; Siegel, M. openurl 
  Title Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content Type Journal Article
  Year 2012 Publication Abbreviated Journal J. Appl. Phys.  
  Volume 112 Issue Pages  
  Keywords SSPD, SNSPD, magnetron sputtering, spectrum, NbN film, nitrogen concentration  
  Abstract The spectral detection efficiency and the dark count rate of superconducting nanowire

single-photon detectors (SNSPD) have been studied systematically on detectors made from thin

NbN films with different chemical compositions. Reduction of the nitrogen content in the 4 nm

thick NbN films results in a decrease of the dark count rates more than two orders of magnitude

and in a red shift of the cut-off wavelength of the hot-spot SNSPD response. The observed

phenomena are explained by an improvement of uniformity of NbN films that has been confirmed

by a decrease of resistivity and an increase of the ratio of the measured critical current to the

depairing current. The latter factor is considered as the most crucial for both the cut-off

wavelength and the dark count rates of SNSPD. Based on our results we propose a set of criteria

for material properties to optimize SNSPD in the infrared spectral region. VC 2012 American

Institute of Physics. [http://dx.doi.org/10.1063/1.4757625]		  
  Address  
  Corporate Author D. Henrich, S. Dorner, M. Hofherr, K. Il'in, A. Semenov, E. Heintze, M. Scheffler, M. Dressel, M. Siegel Thesis  
  Publisher Place of Publication Editor  
  Language (down) English Summary Language Original Title Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number RPLAB @ seleznev @ Serial 877  
Permanent link to this record
 
 
Author Sclafani, M.; Marksteiner, M.; Keir, F. M. L.; Divochiy, A.; Korneev, A.; Semenov, A.; Gol'tsman, G.; Arndt, M. url  doi
openurl 
  Title Sensitivity of a superconducting nanowire detector for single ions at low energy Type Journal Article
  Year 2012 Publication Nanotechnol. Abbreviated Journal Nanotechnol.  
  Volume 23 Issue 6 Pages 065501 (1 to 5)  
  Keywords NbN SSPD, SNSPD, superconducting single ion detector, SSID, SNSID  
  Abstract We report on the characterization of a superconducting nanowire detector for ions at low kinetic energies. We measure the absolute single-particle detection efficiency eta and trace its increase with energy up to eta = 100%. We discuss the influence of noble gas adsorbates on the cryogenic surface and analyze their relevance for the detection of slow massive particles. We apply a recent model for the hot-spot formation to the incidence of atomic ions at energies between 0.2 and 1 keV. We suggest how the differences observed for photons and atoms or molecules can be related to the surface condition of the detector and we propose that the restoration of proper surface conditions may open a new avenue for SSPD-based optical spectroscopy on molecules and nanoparticles.  
  Address Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna, Vienna, Austria  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0957-4484 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:22248823 Approved no  
  Call Number Serial 1380  
Permanent link to this record
 
 
Author Bulaevskii, L. N.; Graf, Matthias J.; Kogan, V. G. openurl 
  Title Vortex-assisted photon counts and their magnetic field dependence in single-photon superconducting detectors Type Journal Article
  Year 2012 Publication Phys. Rev. B Abbreviated Journal Phys. Rev. B  
  Volume 85 Issue 1 Pages 9  
  Keywords SSPD; SNSPD; single-vortex crossing; normal-state belt  
  Abstract We argue that photon counts in a superconducting nanowire single-photon detector (SNSPD) are caused by the transition from a current-biased metastable superconducting state to the normal state. Such a transition is triggered by vortices crossing the thin and narrow superconducting strip from one edge to another due to the Lorentz force. Detector counts in SNSPDs may be caused by three processes: (a) a single incident photon with sufficient energy to break enough Cooper pairs to create a normal-state belt across the entire width of the strip (direct photon count), (b) thermally induced single-vortex crossing in the absence of photons (dark count), which at high-bias currents releases the energy sufficient to trigger the transition to the normal state in a belt across the whole width of the strip, and (c) a single incident photon of insufficient energy to create a normal-state belt but initiating a subsequent single-vortex crossing, which provides the rest of the energy needed to create the normal-state belt (vortex-assisted single-photon count). We derive the current dependence of the rate of vortex-assisted photon counts. The resulting photon count rate has a plateau at high currents close to the critical current and drops as a power law with high exponent at lower currents. While the magnetic field perpendicular to the film plane does not affect the formation of hot spots by photons, it causes the rate of vortex crossings (with or without photons) to increase. We show that by applying a magnetic field one may characterize the energy barrier for vortex crossings and identify the origin of dark counts and vortex-assisted photon counts.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 733  
Permanent link to this record
 
 
Author Knee, George C.; Simmons, Stephanie; Gauger, Erik M.; Morton, John J. L.; Riemann, Helge; Abrosimov, Nikolai V.; Becker, Peter; Pohl, Hans-Joachim; Itoh, Kohei M.; Thewalt, Mike L. W.; Briggs, G. Andrew D.; Benjamin, Simon C. openurl 
  Title Violation of a Leggett–Garg inequality with ideal non-invasive measurements Type Journal Article
  Year 2012 Publication Nature Communications Abbreviated Journal Nat. Comm.  
  Volume 3 Issue 606 Pages 6  
  Keywords fromIPMRAS  
  Abstract The quantum superposition principle states that an entity can exist in two different states simultaneously, counter to our 'classical' intuition. Is it possible to understand a given system's behaviour without such a concept? A test designed by Leggett and Garg can rule out this possibility. The test, originally intended for macroscopic objects, has been implemented in various systems. However to date no experiment has employed the 'ideal negative result' measurements that are required for the most robust test. Here we introduce a general protocol for these special measurements using an ancillary system, which acts as a local measuring device but which need not be perfectly prepared. We report an experimental realization using spin-bearing phosphorus impurities in silicon. The results demonstrate the necessity of a non-classical picture for this class of microscopic system. Our procedure can be applied to systems of any size, whether individually controlled or in a spatial ensemble.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 767  
Permanent link to this record
 
 
Author Smith, Devin H.; Gillett, Geoff; de Almeida, Marcelo P.; Branciard, Cyril; Fedrizzi, Alessandro; Weinhold, Till J.; Lita, Adriana; Calkins, Brice; Gerrits, Thomas; Wiseman, Howard M.; Nam, Sae Woo; White, Andrew G. openurl 
  Title Conclusive quantum steering with superconducting transition-edge sensors Type Journal Article
  Year 2012 Publication Nature Communications Abbreviated Journal Nat. Comm.  
  Volume 3 Issue 625 Pages 6  
  Keywords fromIPMRAS  
  Abstract Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted. A conclusive demonstration of steering through the violation of a steering inequality is of considerable fundamental interest and opens up applications in quantum communication. To date, all experimental tests with single-photon states have relied on post selection, allowing untrusted devices to cheat by hiding unfavourable events in losses. Here we close this 'detection loophole' by combining a highly efficient source of entangled photon pairs with superconducting transition-edge sensors. We achieve an unprecedented ~62% conditional detection efficiency of entangled photons and violate a steering inequality with the minimal number of measurement settings by 48 s.d.s. Our results provide a clear path to practical applications of steering and to a photonic loophole-free Bell test.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 768  
Permanent link to this record
 
 
Author Ghali, Mohsen; Ohtani1, Keita; Ohno, Yuzo; Ohno, Hideo openurl 
  Title Generation and control of polarization-entangled photons from GaAs island quantum dots by an electric field Type Journal Article
  Year 2012 Publication Nature Communications Abbreviated Journal Nat. Comm.  
  Volume 3 Issue 661 Pages 6  
  Keywords fromIPMRAS  
  Abstract Semiconductor quantum dots are potential sources for generating polarization-entangled photons efficiently. The main prerequisite for such generation based on biexciton-exciton cascaded emission is to control the exciton fine-structure splitting. Among various techniques investigated for this purpose, an electric field is a promising means to facilitate the integration into optoelectronic devices. Here we demonstrate the generation of polarization-entangled photons from single GaAs quantum dots by an electric field. In contrast to previous studies, which were limited to In(Ga)As quantum dots, GaAs island quantum dots formed by a thickness fluctuation were used because they exhibit a larger oscillator strength and emit light with a shorter wavelength. A forward voltage was applied to a Schottky diode to control the fine-structure splitting. We observed a decrease and suppression in the fine-structure splitting of the studied single quantum dot with the field, which enabled us to generate polarization-entangled photons with a high fidelity of 0.72 ± 0.05.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language (down) Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 769  
Permanent link to this record
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