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Activating hidden metrological usefulness

dc.contributor.authorTóth, Géza
dc.contributor.authorVértesi, Tamás
dc.contributor.authorHorodecki, Paweł
dc.contributor.authorHorodecki, Ryszard
dc.date.accessioned2020-08-07T08:51:19Z
dc.date.available2020-08-07T08:51:19Z
dc.date.issued2020-07-07
dc.identifier.citationPhysical Review Letters 125 : (2020) // Article ID 020402es_ES
dc.identifier.issn0031-9007
dc.identifier.urihttp://hdl.handle.net/10810/45910
dc.description.abstract[EN] We consider bipartite entangled states that cannot outperform separable states in any linear interferometer. Then, we show that these states can still be more useful metrologically than separable states if several copies of the state are provided or an ancilla is added to the quantum system. We present a general method to find the local Hamiltonian for which a given quantum state performs the best compared to separable states. We obtain analytically the optimal Hamiltonian for some quantum states with a high symmetry. We show that all bipartite entangled pure states outperform separable states in metrology. Some potential applications of the results are also suggested.es_ES
dc.description.sponsorshipWe acknowledge the support of the EU (ERC Starting Grant No. 258647/GEDENTQOPT, COST Action CA15220, QuantERA CEBBEC, QuantERA eDICT), the Spanish MCIU (Grant No. PCI2018-092896), the Spanish Ministry of Science, Innovation and Universities and the European Regional Development Fund FEDER through Grant No. PGC2018-101355-B-I00 (MCIU/AEI/FEDER, EU), the Basque Government (Grant No. IT986-16), and the National Research, Development and Innovation Office NKFIH (Grants No. K124351, No. KH129601, No. KH125096, and No. 2019-2.1.7-ERA-NET-2020-00003). We also acknowledge support by the Foundation for Polish Science through IRAP project co-financed by the EU within the Smart Growth Operational Programme (Contract No. 2018/MAB/5). G. T. thanks a Bessel Research Award of the Humboldt Foundation.es_ES
dc.language.isoenges_ES
dc.publisherAmerican Physical Societyes_ES
dc.relationinfo:eu-repo/grantAgreement/MCIU/PCI2018-092896es_ES
dc.relationinfo:eu-repo/grantAgreement/MCIU/PGC2018-101355-B-I00es_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/es/*
dc.titleActivating hidden metrological usefulnesses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.holderPublished by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.es_ES
dc.relation.publisherversionhttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.020402es_ES
dc.identifier.doi10.1103/PhysRevLett.125.020402
dc.departamentoesFísica teórica e historia de la cienciaes_ES
dc.departamentoeuFisika teorikoa eta zientziaren historiaes_ES


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