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      Classical synchronization indicates persistent entanglement in isolated quantum systems

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          Abstract

          Synchronization and entanglement constitute fundamental collective phenomena in multi-unit classical and quantum systems, respectively, both equally implying coordinated system states. Here, we present a direct link for a class of isolated quantum many-body systems, demonstrating that synchronization emerges as an intrinsic system feature. Intriguingly, quantum coherence and entanglement arise persistently through the same transition as synchronization. This direct link between classical and quantum cooperative phenomena may further our understanding of strongly correlated quantum systems and can be readily observed in state-of-the-art experiments, for example, with ultracold atoms.

          Abstract

          Collective phenomena in many-body systems include synchronization in classical and entanglement in quantum systems. Here the authors study isolated many-body quantum systems and demonstrate that synchronization emerges intrinsically, accompanied by the onset of quantum coherence and persistent entanglement.

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          Quantum information and computation

          In information processing, as in physics, our classical world view provides an incomplete approximation to an underlying quantum reality. Quantum effects like interference and entanglement play no direct role in conventional information processing, but they can--in principle now, but probably eventually in practice--be harnessed to break codes, create unbreakable codes, and speed up otherwise intractable computations.
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            Quantum-enhanced measurements: beating the standard quantum limit.

            Quantum mechanics, through the Heisenberg uncertainty principle, imposes limits on the precision of measurement. Conventional measurement techniques typically fail to reach these limits. Conventional bounds to the precision of measurements such as the shot noise limit or the standard quantum limit are not as fundamental as the Heisenberg limits and can be beaten using quantum strategies that employ "quantum tricks" such as squeezing and entanglement.
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              Bloch Oscillations of Atoms in an Optical Potential

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                Author and article information

                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group
                2041-1723
                12 April 2017
                2017
                : 8
                : 14829
                Affiliations
                [1 ]Forschungszentrum Jülich, Institute for Energy and Climate Research (IEK-STE) , 52428 Jülich, Germany
                [2 ]Institute for Theoretical Physics, University of Cologne , Zuelpicher Str. 77, 50937 Köln, Germany
                [3 ]Network Dynamics, Max Planck Institute for Dynamics and Self-Organization (MPIDS), Am Faßberg , 37077 Göttingen, Germany
                [4 ]Dipartimento di Scienze Matematiche, Fisiche ed Informatiche, Universitá di Parma , Via G.P. Usberti 7/a, 43124 Parma, Italy
                [5 ]INFN, Sezione di Milano Bicocca, Gruppo Collegato di Parma , Parco Area delle Scienze, 7/A, 43124 Parma, Italy
                [6 ]Department of Physics, University of Darmstadt , 64289 Darmstadt, Germany
                [7 ]Institute for Theoretical Physics, Technical University of Dresden , 01062 Dresden, Germany
                Author notes
                Author information
                http://orcid.org/0000-0002-3623-5341
                http://orcid.org/0000-0002-8433-1733
                Article
                ncomms14829
                10.1038/ncomms14829
                5394286
                28401881
                1dcb58d5-980c-4644-9ff3-2bccc6e9ecb2
                Copyright © 2017, The Author(s)

                This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History
                : 15 May 2016
                : 16 December 2017
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