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Saunders, D. J.; Jones, S. J.; Wiseman, H. M.; Pryde, G. J. |
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Title |
Experimental EPR-steering using Bell-local states |
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2010 |
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Nat. Phys. |
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Nat. Phys. |
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6 |
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11 |
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845-849 |
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fromIPMRAS |
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Abstract |
The concept of `steering' was introduced in 1935 by Schrödinger as a generalization of the EPR (Einstein-Podolsky-Rosen) paradox. It has recently been formalized as a quantum-information task with arbitrary bipartite states and measurements, for which the existence of entanglement is necessary but not sufficient. Previous experiments in this area have been restricted to an approach that followed the original EPR argument in considering only two different measurement settings per side. Here we demonstrate experimentally that EPR-steering occurs for mixed entangled states that are Bell local (that is, that cannot possibly demonstrate Bell non-locality). Unlike the case of Bell inequalities, increasing the number of measurement settings beyond two-we use up to six-significantly increases the robustness of the EPR-steering phenomenon to noise. |
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RPLAB @ gujma @ |
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808 |
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Author |
Toyabe, Shoichi; Sagawa, Takahiro; Ueda, Masahito; Muneyuki, Eiro; Sano, Masaki |
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Title |
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 |
Abbreviated Journal |
Nat. Phys. |
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6 |
Issue |
12 |
Pages |
988-992 |
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fromIPMRAS |
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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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Author |
Home, Jonathan |
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Title |
Quantum entanglement: Watching correlations disappear |
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Journal Article |
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2010 |
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Nature Physics |
Abbreviated Journal |
Nat. Phys. |
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6 |
Issue |
12 |
Pages |
938-939 |
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fromIPMRAS |
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Engineered decoherence enables tracking of multipartite entanglement as a quantum state decays. |
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RPLAB @ gujma @ |
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832 |
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Saffman, Mark |
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Title |
Quantum computing: A quantum telecom link |
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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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11 |
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838-839 |
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fromIPMRAS |
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Converting data-carrying photons to telecommunication wavelengths enables distribution of quantum information over long distances. |
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RPLAB @ gujma @ |
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833 |
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Author |
Raussendorf, Robert |
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Title |
Quantum computing: Shaking up ground states |
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Journal Article |
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2010 |
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Nature Physics |
Abbreviated Journal |
Nat. Phys. |
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6 |
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11 |
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840-841 |
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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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Author |
Buchanan, Mark |
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Title |
Body of evidence |
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Manuscript |
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Year |
2010 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
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6 |
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RPLAB @ gujma @ |
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837 |
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Author |
Kono, Junichiro |
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Title |
Coherent terahertz control |
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Journal Article |
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2011 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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5 |
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5-6 |
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fromIPMRAS |
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Spin and charge terahertz excitations in solids are promising for implementing future technologies such as spintronics and quantum computation, but coherently controlling them has been a significant challenge. Researchers have now manipulated coherent spin waves in an antiferromagnet using the intense magnetic field of ultrashort terahertz pulses. |
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RPLAB @ gujma @ |
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773 |
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Author |
Paiella, Roberto |
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Title |
Terahertz quantum cascade lasers: Going ultrafast |
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Journal Article |
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2011 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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5 |
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253–255 |
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fromIPMRAS |
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A new asynchronous coherent optical sampling method allows for the direct visualization of actively mode-locked quantum cascade laser pulses at terahertz wavelengths. |
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RPLAB @ gujma @ |
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774 |
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Author |
Wu, Ming C. |
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Title |
Optoelectronic tweezers |
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Journal Article |
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2011 |
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Nature Photonics |
Abbreviated Journal |
Nature Photon |
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5 |
Issue |
6 |
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322-324 |
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fromIPMRAS |
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Abstract |
Using projected light patterns to form virtual electrodes on a photosensitive substrate, optoelectronic tweezers are able to grab and move micro- and nanoscale objects at will, facilitating applications far beyond biology and colloidal science. |
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RPLAB @ gujma @ |
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775 |
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Author |
Fazal, Furqan M.; Block, Steven M. |
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Title |
Optical tweezers study life under tension |
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2011 |
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Nature Photonics |
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Nat. Photon. |
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5 |
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6 |
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318-321 |
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fromIPMRAS |
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Optical tweezers have become one of the primary weapons in the arsenal of biophysicists, and have revolutionized the new field of single-molecule biophysics. Today's techniques allow high-resolution experiments on biological macromolecules that were mere pipe dreams only a decade ago. |
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RPLAB @ gujma @ |
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776 |
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