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Author Driessen, Eduard Frans Clemens openurl 
  Title Coupling light to periodic nanostructures Type Journal Article
  Year 2009 Publication Faculty of Science, Leiden University Abbreviated Journal Fac. Scien., Leiden Un.  
  Volume Issue (down) Pages 144  
  Keywords SSPD  
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  Notes Issue Date: 2009-09-24 Approved no  
  Call Number RPLAB @ gujma @ Serial 675  
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Author Hadfield, Robert H. doi  openurl
  Title Single-photon detectors for optical quantum information applications Type Journal Article
  Year 2009 Publication Nature Photonics Abbreviated Journal Nature Photonics  
  Volume 3 Issue (down) Pages 696-705  
  Keywords SPD  
  Abstract The past decade has seen a dramatic increase in interest in new single-photon detector technologies. A major cause of this trend has undoubtedly been the push towards optical quantum information applications such as quantum key distribution. These new applications place extreme demands on detector performance that go beyond the capabilities of established single-photon detectors. There has been considerable effort to improve conventional photon-counting detectors and to transform new device concepts into workable technologies for optical quantum information applications. This Review aims to highlight the significant recent progress made in improving single-photon detector technologies, and the impact that these developments will have on quantum optics and quantum information science.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 678  
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Author Смирнов, Андрей Владимирович openurl 
  Title Исследование полосы преобразования терагерцовых смесителей на эффекте электронного разогрева в NbZr, NbN и в одиночном гетеропереходе AlGaAs/GaAs Type Manuscript
  Year 2009 Publication Радиофизика Abbreviated Journal Радиофиз.  
  Volume Issue (down) Pages 139  
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  Notes Диссертация Approved no  
  Call Number RPLAB @ gujma @ Serial 718  
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Author Lobanov, Y.; Tong, C.; Blundell, R.; Gol'tsman, G. url  openurl
  Title A study of direct detection effect on the linearity of hot electron bolometer mixers Type Conference Article
  Year 2009 Publication Proc. 20th Int. Symp. Space Terahertz Technol. Abbreviated Journal Proc. 20th ISSTT  
  Volume Issue (down) Pages 282-287  
  Keywords HEB mixer, direct detection effect  
  Abstract We have performed a study of how direct detection affects the linearity and hence the calibration of an HEB mixer. Two types of waveguide HEB devices have been used: a 0.8 THz HEB mixer and a 1.0 THz HEB mixer which is ~5 times smaller than the former. Two independent experimental approaches were used. In the ΔG/G method, the conversion gain of the HEB mixer is first measured as a function of the bias current for a number of bias voltages. At each bias setting, we carefully measure the change in the operating current when the input loads are switched. From the measured data, we can derive the expected difference in gain between the hot and cold loads. In the second method (injection method [1]), the linearity of the HEB mixer is independently measured by injecting a modulated signal for different input load temperatures. The results of both approaches confirm that there is gain compression in the operation of HEB mixers. Based on the results of our measurements, we discuss the impact of direct detection effects on the operation of HEB mixers.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 724  
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Author Hu, Xiaolong; Dauler, Eric A.; Kerman, Andrew J.; Yang, Joel K. W.; White, James E.; Herder, Charles H.; Berggren, Karl K. openurl 
  Title Using surface plasmons to enhance the speed and efficiency of superconducting nanowire single-photon detectors Type Conference Article
  Year 2009 Publication Proceedings of the Conference on Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference Abbreviated Journal Proc of Conf. on Lasers and El.-Opt.  
  Volume Issue (down) Pages 1-2  
  Keywords optical antennas  
  Abstract We report our design and fabrication of superconducting nanowire single-photon detectors integrated with gold plasmonic nanostructures, which can enhance the absorption of TM-polarized light, and can enlarge the effective area without sacrificing detector speed.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 744  
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Author Bharadwaj, Palash; Deutsch, Bradley; Novotny, Lukas openurl 
  Title Optical Antennas Type Journal Article
  Year 2009 Publication Advances in Optics and Photonics Abbreviated Journal Adv. Opt. Photon  
  Volume 1 Issue (down) Pages 438-483  
  Keywords optical antennas  
  Abstract Optical antennas are an emerging concept in physical optics. Similar to radiowave

and microwave antennas, their purpose is to convert the energy of free propagating radiation to localized energy, and vice versa. Optical antennas exploit the unique properties of metal nanostructures, which behave as strongly coupled plasmas at ptical frequencies. The tutorial provides an account of the historical origins and the basic concepts and parameters associated with optical antennas. It also reviews recent work in the field and discusses areas of application, such as light-emitting devices, photovoltaics, and spectroscopy.		  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 754  
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Author Esteban, Eduin; Serna, Hernandez openurl 
  Title Quantum key distribution protocol with private-public key Type Journal Article
  Year 2009 Publication arXiv Abbreviated Journal arXiv  
  Volume Issue (down) Pages 3  
  Keywords quantum cryptography; QKD; protocol  
  Abstract A quantum cryptographic protocol based in public key cryptography combinations and private key cryptography is presented. Unlike the BB84 protocol 1 and its many variants 2,3 two quantum channels are used. The present research does not make reconciliation mechanisms of information to derive the key. A three related system of key distribution are described.  
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  Notes arXiv: 0908.2146 Approved no  
  Call Number RPLAB @ gujma @ Serial 756  
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Author Shor, Peter W. openurl 
  Title Quantum information theory: The bits don't add up Type Journal Article
  Year 2009 Publication Nature Physics Abbreviated Journal Nat. Phys.  
  Volume 5 Issue (down) Pages 247 - 248  
  Keywords fromIPMRAS  
  Abstract A counterexample to the 'additivity question', the most celebrated open problem in the mathematical theory of quantum information, casts doubt on the possibility of finding a simple expression for the information capacity of a quantum channel.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 800  
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Author Pekker, David; Shah, Nayana; Sahu, Mitrabhanu; Bezryadin, Alexey; Goldbart, Paul M. doi  openurl
  Title Stochastic dynamics of phase-slip trains and superconductive-resistive switching in current-biased nanowires Type Journal Article
  Year 2009 Publication Phys. Rev. B Abbreviated Journal  
  Volume 80 Issue (down) Pages 214525 (1 to 17)  
  Keywords superconducting nanowire, phase-slip, order parameter, HEB distributed model, HEB model  
  Abstract Superconducting nanowires fabricated via carbon-nanotube templating can be used to realize and study quasi-one-dimensional superconductors. However, measurement of the linear resistance of these nanowires have been inconclusive in determining the low-temperature behavior of phase-slip fluctuations, both quantal and thermal. Thus, we are motivated to study the nonlinear current-voltage characteristics in current-biased nanowires and the stochastic dynamics of superconductive-resistive switching, as a way of probing phase-slip events. In particular, we address the question: can a single phase-slip event occurring somewhere along the wire—during which the order-parameter fluctuates to zero—induce switching, via the local heating it causes? We explore this and related issues by constructing a stochastic model for the time evolution of the temperature in a nanowire whose ends are maintained at a fixed temperature. We derive the corresponding master equation as a tool for evaluating and analyzing the mean switching time at a given value of current (smaller than the depairing critical current). The model indicates that although, in general, several phase-slip events are necessary to induce switching via a thermal runaway, there is indeed a regime of temperatures and currents in which a single event is sufficient. We carry out a detailed comparison of the results of the model with experimental measurements of the distribution of switching currents, and provide an explanation for the rather counterintuitive broadening of the distribution width that is observed upon lowering the temperature. Moreover, we identify a regime in which the experiments are probing individual phase-slip events, and thus offer a way of unearthing and exploring the physics of nanoscale quantum tunneling of the one-dimensional collective quantum field associated with the superconducting order parameter.  
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  Notes Recommended by Klapwijk Approved no  
  Call Number Serial 923  
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Author Sahu, Mitrabhanu; Bae, Myung-Ho; Rogachev, Andrey; Pekker, David; Wei, Tzu-Chieh; Shah, Nayana; Goldbart, Paul M.; Bezryadin, Alexey doi  openurl
  Title Individual topological tunnelling events of a quantum field probed through their macroscopic consequences Type Journal Article
  Year 2009 Publication Nature Phys. Abbreviated Journal Nature Phys.  
  Volume 5 Issue (down) Pages 503-508  
  Keywords phase slips, superconducting nanowires  
  Abstract Phase slips are topological fluctuations that carry the superconducting order-parameter field between distinct current-carrying states. Owing to these phase slips, superconducting nanowires acquire electrical resistance. In such wires, it is well known that at higher temperatures phase slips occur through the process of thermal barrier-crossing by the order-parameter field. At low temperatures, the general expectation is that phase slips should proceed through quantum tunnelling events, which are known as quantum phase slips. However, resistive measurements have produced evidence both for and against the occurrence of quantum phase slips. Here, we report evidence for the observation of individual quantum phase-slip events in homogeneous ultranarrow wires at high bias currents. We accomplish this through measurements of the distribution of switching currents for which the width exhibits a rather counter-intuitive, monotonic increase with decreasing temperature. Importantly, measurements show that in nanowires with larger critical currents, quantum fluctuations dominate thermal fluctuations up to higher temperatures.  
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  Notes Recommended by Klapwijk Approved no  
  Call Number Serial 928  
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