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Raussendorf, Robert |
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Title |
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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fromIPMRAS |
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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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Trabesinger, Andreas |
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Title |
Quantum mechanics: Shaken foundations |
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Journal Article |
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2009 |
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Nature Physics |
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Nat. Phys. |
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5 |
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12 |
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863 |
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802 |
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Toyabe, Shoichi; Sagawa, Takahiro; Ueda, Masahito; Muneyuki, Eiro; Sano, Masaki |
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Experimental demonstration of information-to-energy conversion and validation of the generalized Jarzynski equality |
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Journal Article |
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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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12 |
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988-992 |
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In 1929, Leo Szilard invented a feedback protocol in which a hypothetical intelligence called Maxwell's demon pumps heat from an isothermal environment and transduces it to work. After an intense controversy that lasted over eighty years; it was finally clarified that the demon's role does not contradict the second law of thermodynamics, implying that we can convert information to free energy in principle. Nevertheless, experimental demonstration of this information-to-energy conversion has been elusive. Here, we demonstrate that a nonequilibrium feedback manipulation of a Brownian particle based on information about its location achieves a Szilard-type information-energy conversion. Under real-time feedback control, the particle climbs up a spiral-stairs-like potential exerted by an electric field and obtains free energy larger than the amount of work performed on it. This enables us to verify the generalized Jarzynski equality, or a new fundamental principle of “information-heat engine” which converts information to energy by feedback control. |
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RPLAB @ gujma @ |
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831 |
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Home, Jonathan |
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Quantum entanglement: Watching correlations disappear |
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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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12 |
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938-939 |
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Engineered decoherence enables tracking of multipartite entanglement as a quantum state decays. |
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832 |
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Lu, Chao-Yang; Zhou, Xiao-Qi; Gühne, Otfried; Gao, Wei-Bo; Zhang, Jin; Yuan, Zhen-Sheng; Goebel, Alexander; Yang, Tao; Pan, Jian-Wei |
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Title |
Experimental entanglement of six photons in graph states |
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2007 |
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Nature Physics |
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Nat. Phys. |
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3 |
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2 |
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91-95 |
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Graph states-multipartite entangled states that can be represented by mathematical graphs-are important resources for quantum computation, quantum error correction, studies of multiparticle entanglement and fundamental tests of non-locality and decoherence. Here, we demonstrate the experimental entanglement of six photons and engineering of multiqubit graph states. We have created two important examples of graph states, a six-photon Greenberger-Horne-Zeilinger state, the largest photonic Schrödinger cat so far, and a six-photon cluster state, a state-of-the-art `one-way quantum computer'. With small modifications, our method allows us, in principle, to create various further graph states, and therefore could open the way to experimental tests of, for example, quantum algorithms or loss- and fault-tolerant one-way quantum computation. |
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RPLAB @ gujma @ |
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796 |
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