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Author Raussendorf, Robert
Title Quantum computing: Shaking up ground states Type Journal Article
Year 2010 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 6 Issue (up) 11 Pages 840-841
Keywords fromIPMRAS
Abstract Measurement-based quantum computation with an Affleck-Kennedy-Lieb-Tasaki state is experimentally realized for the first time.
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Call Number RPLAB @ gujma @ Serial 834
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Author Trabesinger, Andreas
Title Quantum mechanics: Shaken foundations Type Journal Article
Year 2009 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 5 Issue (up) 12 Pages 863
Keywords fromIPMRAS
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Call Number RPLAB @ gujma @ Serial 802
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Author Toyabe, Shoichi; Sagawa, Takahiro; Ueda, Masahito; Muneyuki, Eiro; Sano, Masaki
Title Experimental demonstration of information-to-energy conversion and validation of the generalized Jarzynski equality Type Journal Article
Year 2010 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 6 Issue (up) 12 Pages 988-992
Keywords fromIPMRAS
Abstract 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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Call Number RPLAB @ gujma @ Serial 831
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Author Home, Jonathan
Title Quantum entanglement: Watching correlations disappear Type Journal Article
Year 2010 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 6 Issue (up) 12 Pages 938-939
Keywords fromIPMRAS
Abstract Engineered decoherence enables tracking of multipartite entanglement as a quantum state decays.
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Call Number RPLAB @ gujma @ Serial 832
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Author Lu, Chao-Yang; Zhou, Xiao-Qi; Gühne, Otfried; Gao, Wei-Bo; Zhang, Jin; Yuan, Zhen-Sheng; Goebel, Alexander; Yang, Tao; Pan, Jian-Wei
Title Experimental entanglement of six photons in graph states Type Journal Article
Year 2007 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 3 Issue (up) 2 Pages 91-95
Keywords fromIPMRAS
Abstract 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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Call Number RPLAB @ gujma @ Serial 796
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