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Terai, Hirotaka; Miki, Shigehito; Yamashita, Taro; Makise, Kazumasa; Wang, Zhen |
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Demonstration of single-flux-quantum readout operation for superconducting single-photon detectors |
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2010 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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97 |
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11 |
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3 |
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SSPD |
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A readout circuit using superconducting single-flux-quantum (SFQ) circuits has been developed to realize an independently addressable array of superconducting single-photon detectors (SSPDs). We tested the SFQ readout circuits by connecting with SSPDs. The error rates of readout circuits were below 10–5 for input signal amplitude of greater than 18.2 μA. Detection efficiencies (DEs) for single-photon incidents were measured both with and without the connection of a readout circuit. The observed DEs traced almost the same curves regardless of the connection of the readout circuit, except that the SSPD is likely to latch by connecting the readout circuit. |
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654 |
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Saunders, D. J.; Jones, S. J.; Wiseman, H. M.; Pryde, G. J. |
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Title |
Experimental EPR-steering using Bell-local states |
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Journal Article |
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2010 |
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Nat. Phys. |
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Nat. Phys. |
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6 |
Issue |
11 |
Pages |
845-849 |
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fromIPMRAS |
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The concept of `steering' was introduced in 1935 by Schrödinger as a generalization of the EPR (Einstein-Podolsky-Rosen) paradox. It has recently been formalized as a quantum-information task with arbitrary bipartite states and measurements, for which the existence of entanglement is necessary but not sufficient. Previous experiments in this area have been restricted to an approach that followed the original EPR argument in considering only two different measurement settings per side. Here we demonstrate experimentally that EPR-steering occurs for mixed entangled states that are Bell local (that is, that cannot possibly demonstrate Bell non-locality). Unlike the case of Bell inequalities, increasing the number of measurement settings beyond two-we use up to six-significantly increases the robustness of the EPR-steering phenomenon to noise. |
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RPLAB @ gujma @ |
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808 |
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Saffman, Mark |
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Title |
Quantum computing: A quantum telecom link |
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2010 |
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Nature Physics |
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Nat. Phys. |
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6 |
Issue |
11 |
Pages |
838-839 |
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fromIPMRAS |
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Converting data-carrying photons to telecommunication wavelengths enables distribution of quantum information over long distances. |
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833 |
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Raussendorf, Robert |
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Quantum computing: Shaking up ground states |
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2010 |
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Nature Physics |
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Nat. Phys. |
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6 |
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11 |
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840-841 |
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Measurement-based quantum computation with an Affleck-Kennedy-Lieb-Tasaki state is experimentally realized for the first time. |
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RPLAB @ gujma @ |
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834 |
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Author |
Ozhegov, R. V.; Gorshkov, K. N.; Okunev, O. V.; Gol’tsman, G. N. |
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Title |
Superconducting hot-electron bolometer mixer as element of thermal imager matrix |
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2010 |
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Tech. Phys. Lett. |
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Tech. Phys. Lett. |
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36 |
Issue |
11 |
Pages |
1006-1008 |
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HEB mixers |
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The possibility of using a matrix of sensitive elements on a 12-mm-diameter hyperhemispherical lens in a thermal imager operating in the terahertz range has been studied. Dimensions of a lens region acceptable for arrangement of the matrix, in which the receiver noise temperature varies within 16% of the mean value, are determined to be 3.3% of the lens diameter. Deviations of the main lobe of the directivity pattern are evaluated, which amount to ±1.25° relative to the direction toward the optimum position of a mixer. The fluctuation sensitivity of the receiver measured in experiment is 0.5 K at a frequency of 300 GHz. |
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1063-7850 |
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1390 |
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