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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. |
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Conclusive quantum steering with superconducting transition-edge sensors |
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2012 |
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Nature Communications |
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Nat. Comm. |
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3 |
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625 |
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6 |
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fromIPMRAS |
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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. |
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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. |
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Title |
Violation of a Leggett–Garg inequality with ideal non-invasive measurements |
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2012 |
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Nature Communications |
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Nat. Comm. |
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3 |
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606 |
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6 |
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fromIPMRAS |
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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. |
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767 |
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Karasik, B. S.; Elantiev, A. I. |
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Noise temperature limit of a superconducting hot-electron bolometer mixer |
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1996 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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68 |
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6 |
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853-855 |
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HEB mixer noise temperature, Johnson noise, thermal fluctuation noise, noise bandwidth |
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0003-6951 |
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Gordon, N. T.; Lees, D. J.; Bowen, G.; Phillips, T. S.; Haigh, M.; Jones, C. L.; Maxey, C. D.; Hipwood, L.; Catchpole, R. A. |
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HgCdTe detectors operating above 200 K |
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2006 |
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J. Electron. Mater. |
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35 |
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6 |
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1140-1144 |
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HgCdTe detector |
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0361-5235 |
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467 |
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Kinch, M. A.; Wan, C.-F., Beck, J. D. |
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1/f noise in HgCdTe photodiodes |
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2005 |
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J. Electron. Mater. |
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34 |
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6 |
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928-932 |
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HgCdTe |
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