Please use this identifier to cite or link to this item:
https://doi.org/10.1103/PhysRevA.84.042313
DC Field | Value | |
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dc.title | Quantum discord of two-qubit X states | |
dc.contributor.author | Chen, Q. | |
dc.contributor.author | Zhang, C. | |
dc.contributor.author | Yu, S. | |
dc.contributor.author | Yi, X.X. | |
dc.contributor.author | Oh, C.H. | |
dc.date.accessioned | 2014-12-12T08:01:53Z | |
dc.date.available | 2014-12-12T08:01:53Z | |
dc.date.issued | 2011-10-06 | |
dc.identifier.citation | Chen, Q., Zhang, C., Yu, S., Yi, X.X., Oh, C.H. (2011-10-06). Quantum discord of two-qubit X states. Physical Review A - Atomic, Molecular, and Optical Physics 84 (4) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.84.042313 | |
dc.identifier.issn | 10502947 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/117129 | |
dc.description.abstract | Quantum discord provides a measure for quantifying quantum correlations beyond entanglement and is very hard to compute even for two-qubit states because of the minimization over all possible measurements. Recently a simple algorithm to evaluate the quantum discord for two-qubit X states was proposed by Ali, Rau, and Alber with minimization taken over only a few cases. Here we shall at first identify a class of X states, whose quantum discord can be evaluated analytically without any minimization, for which their algorithm is valid, and also identify a family of X states for which their algorithm fails. And then we demonstrate that this special family of X states provides furthermore an explicit example for the inequivalence between the minimization over positive operator-valued measures and that over von Neumann measurements. © 2011 American Physical Society. | |
dc.description.uri | http://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1103/PhysRevA.84.042313 | |
dc.source | Scopus | |
dc.type | Article | |
dc.contributor.department | PHYSICS | |
dc.contributor.department | CENTRE FOR QUANTUM TECHNOLOGIES | |
dc.description.doi | 10.1103/PhysRevA.84.042313 | |
dc.description.sourcetitle | Physical Review A - Atomic, Molecular, and Optical Physics | |
dc.description.volume | 84 | |
dc.description.issue | 4 | |
dc.description.page | - | |
dc.description.coden | PLRAA | |
dc.identifier.isiut | 000295628100006 | |
Appears in Collections: | Staff Publications |
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