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Currie, N. C.; Demma, F. J.; Ferris Jr., D. D.; Kwasowsky, B. R.; McMillan, R. W.; Wicks, M. C. |
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Infrared and millimeter-wave sensors for military special operations and law enforcement applications |
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1996 |
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Int. J. Infrared and Millimeter Waves |
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17 |
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7 |
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1117-1138 |
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HgCdTe |
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0195-9271 |
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466 |
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Author |
Czerny, Carl; Germer, Heinrich |
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Selected pianoforte-studies. Edition nr. 300 |
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1900 |
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children, music, piano, learning, school |
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Hansen |
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1845 |
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D. Henrich, L. Rehm S. Dörner, M. Hofherr, K. Il'in, A. Semenov, and M. Siegel |
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Title |
Detection efficiency of a spiral-nanowire superconducting single-photon detector |
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2012 |
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Critical current, Nanoscale devices, Superconducting photodetectors. |
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We investigate the detection efficiency of a spiral layout of a Superconducting Nanowire Single-Photon Detector (SNSPD). The design is less susceptible to the critical current reduction in sharp turns of the nanowire than the conventional meander design. Detector samples with different nanowire width from 300 to 100 nm are patterned from a 4 nm thick NbN film deposited on sapphire substrates. The critical current IC at 4.2 K for spiral, meander, and simple bridge structures is measured and compared. On the 100 nm wide samples, the detection efficiency is measured in the wavelength range 400-1700 nm and the cut-off wavelength of the hot-spot plateau is determined. In the optical range, the spiral detector reaches a detection efficiency of 27.6%, which is ~1.5 times the value of the meander. In the infrared range the detection efficiency is more than doubled. |
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D. Henrich, L. Rehm S. Dörner, M. Hofherr, K. Il'in, A. Semenov, and M. Siegel |
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RPLAB @ seleznev @ |
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880 |
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Dada, Adetunmise C.; Leach, Jonathan; Buller, Gerald S.; Padgett, Miles J.; Andersson, Erika |
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Experimental high-dimensional two-photon entanglement and violations of generalized Bell inequalities |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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9 |
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677-680 |
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fromIPMRAS |
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Quantum entanglement plays a vital role in many quantum-information and communication tasks. Entangled states of higher-dimensional systems are of great interest owing to the extended possibilities they provide. For example, they enable the realization of new types of quantum information scheme that can offer higher-information-density coding and greater resilience to errors than can be achieved with entangled two-dimensional systems (see ref. and references therein). Closing the detection loophole in Bell test experiments is also more experimentally feasible when higher-dimensional entangled systems are used. We have measured previously untested correlations between two photons to experimentally demonstrate high-dimensional entangled states. We obtain violations of Bell-type inequalities generalized to d-dimensional systems up to d=12. Furthermore, the violations are strong enough to indicate genuine 11-dimensional entanglement. Our experiments use photons entangled in orbital angular momentum, generated through spontaneous parametric down-conversion, and manipulated using computer-controlled holograms. |
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RPLAB @ gujma @ |
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828 |
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Author |
Dahl, H.; Metz, H. J.; Wriedt, T. |
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Title |
Light scattering of silver halide crystals |
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1998 |
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Proc. 3rd Workshop on Electromagnetic and Light Scattering |
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51-58 |
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Universität Bremen |
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