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dc.contributor.authorAbanin, Dmitry A.
dc.contributor.authorDemler, Eugene
dc.date.accessioned2019-09-26T15:00:21Z
dc.date.issued2012
dc.identifier.citationAbanin, Dmitry A., and Eugene Demler. 2012. “Measuring Entanglement Entropy of a Generic Many-Body System with a Quantum Switch.” Physical Review Letters 109 (2). https://doi.org/10.1103/physrevlett.109.020504.
dc.identifier.issn0031-9007
dc.identifier.issn1079-7114
dc.identifier.issn1092-0145
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41412095*
dc.description.abstractEntanglement entropy has become an important theoretical concept in condensed matter physics because it provides a unique tool for characterizing quantum mechanical many-body phases and new kinds of quantum order. However, the experimental measurement of entanglement entropy in a many-body system is widely believed to be unfeasible, owing to the nonlocal character of this quantity. Here, we propose a general method to measure the entanglement entropy. The method is based on a quantum switch (a two-level system) coupled to a composite system consisting of several copies of the original many-body system. The state of the switch controls how different parts of the composite system connect to each other. We show that, by studying the dynamics of the quantum switch only, the Renyi entanglement entropy of the many-body system can be extracted. We propose a possible design of the quantum switch, which can be realized in cold atomic systems. Our work provides a route towards testing the scaling of entanglement in critical systems as well as a method for a direct experimental detection of topological order.
dc.language.isoen_US
dc.publisherAmerican Physical Society
dash.licenseOAP
dc.titleMeasuring Entanglement Entropy of a Generic Many-Body System with a Quantum Switch
dc.typeJournal Article
dc.description.versionAccepted Manuscript
dc.relation.journalPhysical Review Letters
dash.depositing.authorDemler, Eugene A.::966ad10e063726c62d649ffd97bccc3b::600
dc.date.available2019-09-26T15:00:21Z
dash.workflow.comments1Science Serial ID 78715
dc.identifier.doi10.1103/PhysRevLett.109.020504
dash.source.volume109;2


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