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Kerr, A. R.; Feldman, M. J.; Pan, S.-K. |
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Receiver noise temperature, the quantum noise limit, and zero–point fluctuations |
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1997 |
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Proc. 8th Int. Symp. Space Terahertz Technol. |
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101-111 |
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277 |
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Kerr, A. R.; Feldman, M. J.; Pan, S.-K. |
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Receiver noise temperature, the quantum noise limit, and the role of the zero-point fluctuations |
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1996 |
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Electronics division internal report NO. 304 |
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1-10 |
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RPLAB @ atomics90 @ |
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947 |
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Kim, Yong-Su; Lee, Jong-Chan; Kwon, Osung; Kim, Yoon-Ho |
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Protecting entanglement from decoherence using weak measurement and quantum measurement reversal |
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2012 |
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Nature Physics |
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Nat. Phys. |
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8 |
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2 |
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117-120 |
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fromIPMRAS |
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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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RPLAB @ gujma @ |
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815 |
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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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468 |
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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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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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RPLAB @ gujma @ |
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767 |
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