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Detecting two qubit both-way positive discord states
K MUKHERJEE, S KARMAKAR, B PAUL,
Published in Springer New York LLC
2019
Volume: 73
   
Issue: 8
Abstract
Abstract: Quantum discord plays a pragmatic role in analyzing nonclassical feature of quantum correlations beyond entanglement. It is used in several information processing protocols which lacks sufficient amount of entanglement to be used as a resource. We have provided with an analytical method of detecting quantum discord of an arbitrary two qubit state. We have formulated a set of necessary and sufficient conditions for any two qubit state to be a both-way non-zero quantum discord state. As quantum discord is asymmetric in nature, we have framed the set of if and only if conditions for a two qubit state to be classical-quantum as well for it to be quantum-classical. Interestingly, not only correlation tensor but also local Bloch vector (corresponding to the classical party) plays a role for detecting the state to be a positive discord state. Graphical abstract: [Figure not available: see fulltext.]. © 2019, EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature.
About the journal
JournalData powered by TypesetEuropean Physical Journal D
PublisherData powered by TypesetSpringer New York LLC
ISSN1434-6060
Open AccessYes