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Discording power of quantum evolutions

AuthorsGalve, Fernando ; Plastina, Francesco; Paris, Matteo G. A.; Zambrini, Roberta
Issue Date4-Jan-2013
PublisherAmerican Physical Society
CitationPhysical Review Letters 110(1): 010501 (2013)
AbstractWe introduce the discording power of a unitary transformation, which assesses its capability to produce quantum discord, and analyze in detail the generation of discord by relevant classes of two-qubit gates. Our measure is based on the Cartan decomposition of two-qubit unitaries and on evaluating the maximum discord achievable by a unitary upon acting on classical-classical states at fixed purity. We find that there exist gates which are perfect discorders for any value of purity ο, and that they belong to a class of operators that includes the √SWAP. Other gates, even those universal for quantum computation, do not posses the same property: the CNOT, for example, is a perfect discorder only for states with low or unit purity, but not for intermediate values. The discording power of a two-qubit unitary also provides a generalization of the corresponding measure defined for entanglement to any value of the purity. © 2013 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.110.010501
Identifiersdoi: 10.1103/PhysRevLett.110.010501
issn: 0031-9007
e-issn: 1079-7114
Appears in Collections:(IFISC) Artículos
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