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Author Kim, Yong-Su; Lee, Jong-Chan; Kwon, Osung; Kim, Yoon-Ho openurl 
  Title Protecting entanglement from decoherence using weak measurement and quantum measurement reversal Type Journal Article
  Year 2012 Publication Nature Physics Abbreviated Journal Nat. Phys.  
  Volume 8 Issue 2 Pages (down) 117-120  
  Keywords fromIPMRAS  
  Abstract Decoherence, often caused by unavoidable coupling with the environment, leads to degradation of quantum coherence. For a multipartite quantum system, decoherence leads to degradation of entanglement and, in certain cases, entanglement sudden death. Tackling decoherence, thus, is a critical issue faced in quantum information, as entanglement is a vital resource for many quantum information applications including quantum computing, quantum cryptography, quantum teleportation and quantum metrology. Here, we propose and demonstrate a scheme to protect entanglement from decoherence. Our entanglement protection scheme makes use of the quantum measurement itself for actively battling against decoherence and it can effectively circumvent even entanglement sudden death.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 815  
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Author Hollenberg, Lloyd C. L. openurl 
  Title Quantum control: Through the quantum chicane Type Journal Article
  Year 2012 Publication Nature Physics Abbreviated Journal Nat. Phys.  
  Volume 8 Issue 2 Pages (down) 113-114  
  Keywords fromIPMRAS  
  Abstract In quantum control there is an inherent tension between high fidelity requirements and the need for speed to avoid decoherence. A direct comparison of quantum control protocols at these two extremes indicates where the sweet spot may lie.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 812  
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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 (down) 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.  
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  Language Russian Summary Language Original Title  
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  Notes Approved no  
  Call Number Serial 1825  
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Author Korotkov, Alexander N. openurl 
  Title Entanglement preservation: The Sleeping Beauty approach Type Journal Article
  Year 2012 Publication Nature Physics Abbreviated Journal Nat. Phys.  
  Volume 8 Issue 2 Pages (down) 107-108  
  Keywords fromIPMRAS  
  Abstract Two-qubit entanglement can be preserved by partially measuring the qubits to leave them in a 'lethargic' state. The original state is restored using quantum measurement reversal after the qubits have travelled through a decoherence channel.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 814  
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Author Tuchak, A. N.; Gol’tsman, G. N.; Kitaeva, G. K.; Penin, A. N.; Seliverstov, S. V.; Finkel, M. I.; Shepelev, A. V.; Yakunin, P. V. url  doi
openurl 
  Title Generation of nanosecond terahertz pulses by the optical rectification method Type Journal Article
  Year 2012 Publication JETP Lett. Abbreviated Journal JETP Lett.  
  Volume 96 Issue 2 Pages (down) 94-97  
  Keywords optical rectification, lithium niobate crystal  
  Abstract The possibility of the generation of quasi-cw terahertz radiation by the optical rectification method for broad-band Fourier unlimited nanosecond laser pulses has been experimentally demonstrated. The broadband radiation of a LiF dye-center laser is used as a pump source of a nonlinear optical oscillator. The energy efficiency of terahertz optical frequency conversion in a periodically polarized lithium niobate crystal is 4 × 10−9 at a pump power density of 7 MW/cm2.  
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  ISSN 0021-3640 ISBN Medium  
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  Notes Approved no  
  Call Number Serial 1377  
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Author Akalin, Tahsin openurl 
  Title Terahertz sources: Powerful photomixers Type Journal Article
  Year 2012 Publication Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue 2 Pages (down) 81  
  Keywords fromIPMRAS  
  Abstract An efficient continuous-wave source of terahertz radiation that combines the outputs from two near-infrared semiconductor lasers in a novel photomixer looks set to benefit applications in spectroscopy and imaging.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 787  
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Author Xu, XinAn; Wong, Chee Wei openurl 
  Title Quantum optics: Correlations on a chip Type Journal Article
  Year 2012 Publication Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue Pages (down) 75-76  
  Keywords fromIPMRAS  
  Abstract Researchers have developed a semiconductor structure capable of supporting quantum correlations between photons and strong single-photon nonlinearities, thus paving the way for the development of chip-based devices for quantum secure communications and quantum information processing.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 782  
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Author Korneev, A.; Korneeva, Y.; Florya, I.; Voronov, B.; Goltsman, G. url  doi
openurl 
  Title NbN nanowire superconducting single-photon detector for mid-infrared Type Journal Article
  Year 2012 Publication Phys. Procedia Abbreviated Journal Phys. Procedia  
  Volume 36 Issue Pages (down) 72-76  
  Keywords NbN SSPD, SNSPD  
  Abstract Superconducting single-photon detectors (SSPD) is typically 100 nm-wide supercondiucting strip in a shape of meander made of 4-nm-thick film. To reduce response time and increase voltage response a parallel connection of the strips was proposed. Recently we demonstrated that reduction of the strip width improves the quantum effciency of such a detector at wavelengths longer than 1.5 μm. Being encourage by this progress in quantum effciency we improved the fabrication process and made parallel-wire SSPD with 40-nm-wide strips covering total area of 10 μm x 10 μm. In this paper we present the results of the characterization of such a parallel-wire SSPD at 10.6 μm wavelength and demonstrate linear dependence of the count rate on the light power as it should be in case of single-photon response.  
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  ISSN 1875-3892 ISBN Medium  
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  Notes Approved no  
  Call Number Serial 1382  
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Author De Luca, M.; Gupta, H.; Neufeld, D.; Gerin, M.; Teyssier, D.; Drouin, B. J.; Pearson, J. C.; Lis, D. C.; Monje, R.; Phillips, T. G.; Goicoechea, J. R.; Godard, B.; Falgarone, E.; Coutens, A.; Bell, T. A. doi  openurl
  Title Herschel/HIFI discovery of HCL+ in the interstellar medium Type Journal Article
  Year 2012 Publication Astrophys. J. Lett. Abbreviated Journal  
  Volume 751 Issue 2 Pages (down) L37  
  Keywords HEB mixer applications, HIFI, Herschel  
  Abstract The radical ion HCl+, a key intermediate in the chlorine chemistry of the interstellar gas, has been identified for the first time in the interstellar medium with the Herschel Space Observatory's Heterodyne Instrument for the Far-Infrared. The ground-state rotational transition of H35Cl+, 2Π3/2 J = 5/2-3/2, showing Λ-doubling and hyperfine structure, is detected in absorption toward the Galactic star-forming regions W31C (G10.6-0.4) and W49N. The complex interstellar absorption features are modeled by convolving in velocity space the opacity profiles of other molecular tracers toward the same sources with the fine and hyperfine structure of HCl+. This structure is derived from a combined analysis of optical data from the literature and new laboratory measurements of pure rotational transitions, reported in the accompanying Letter by Gupta et al. The models reproduce well the interstellar absorption, and the frequencies inferred from the astronomical observations are in exact agreement with those calculated using spectroscopic constants derived from the laboratory data. The detection of H37Cl+ toward W31C, with a column density consistent with the expected 35Cl/37Cl isotopic ratio, provides additional evidence for the identification. A comparison with the chemically related molecules HCl and H2Cl+ yields an abundance ratio of unity with both species (HCl+ : H2Cl+ : HCl ~ 1). These observations also yield the unexpected result that HCl+ accounts for 3%-5% of the gas-phase chlorine toward W49N and W31C, values several times larger than the maximum fraction (~1%) predicted by chemical models.  
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  Notes Approved no  
  Call Number Serial 1092  
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Author Pile, David openurl 
  Title How many bits can a photon carry Type Journal Article
  Year 2012 Publication Nature Photonics Abbreviated Journal Nat. Photon.  
  Volume 6 Issue 1 Pages (down) 14-15  
  Keywords fromIPMRAS  
  Abstract Quantum physics offers a way to enhance the amount of information a photon can carry, with potential applications in optical communication, lithography, metrology and imaging.  
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  Notes View from... OSA Frontiers in Optics 2011: How many bits can a photon carry? Approved no  
  Call Number RPLAB @ gujma @ Serial 780  
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