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Decoherence-assisted detection of entanglement of two qubit states

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cris.lastimport.scopus2024-02-12T20:14:45Z
dc.abstract.enWe show that the decoherence, which in the long run destroys quantum features of a system, can be used to reveal the entanglement in a two-qubit system. To this end, we consider a criterion that formally resembles the Clauser-Horne-Shimony-Holt (CHSH) inequality. In our case the local observables are set by the coupling of each qubit to the environmental noise, controlled with the dynamical decoupling method. We demonstrate that the constructed inequality is an entanglement criterion—it can only be violated by nonseparable initial two-qubit states, provided that the local noises are correlated. We also show that, for a given initial state, this entanglement criterion can be repurposed as a method of discriminating between Gaussian and non-Gaussian noise generated by the environment of the qubits. The latter application is important for ongoing research on using qubits to characterize the dynamics of environment that perturbs them and causes their decoherence.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKrzywda, J.
dc.contributor.authorChwedeńczuk, Jan
dc.contributor.authorCywiński, Łukasz
dc.contributor.authorSzańkowski, Piotr
dc.date.accessioned2024-01-24T21:18:14Z
dc.date.available2024-01-24T21:18:14Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.number2
dc.description.volume98
dc.identifier.doi10.1103/PHYSREVA.98.022329
dc.identifier.issn2469-9926
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/104403
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofPhysical Review A
dc.relation.pages022329-1-11
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleDecoherence-assisted detection of entanglement of two qubit states
dc.typeJournalArticle
dspace.entity.typePublication