Research

Quantifying the Nonclassicality of Operations


Reference:

Meznaric, S., Clark, S. R. and Datta, A., 2013. Quantifying the Nonclassicality of Operations. Physical Review Letters, 110 (7), 070502.

Related documents:

[img] Other (Quantifying the Nonclassicality of Operations)
Download (193kB)

    Official URL:

    http://dx.doi.org/10.1103/PhysRevLett.110.070502

    Abstract

    Deep insight can be gained into the nature of nonclassical correlations by studying the quantum operations that create them. Motivated by this we propose a measure of nonclassicality of a quantum operation utilizing the relative entropy to quantify its commutativity with the completely dephasing operation. We show that our measure of nonclassicality is a sum of two independent contributions, the generating power -- its ability to produce nonclassical states out of classical ones, and the distinguishing power -- its usefulness to a classical observer for distinguishing between classical and nonclassical states. Each of these effects can be exploited individually in quantum protocols. We further show that our measure leads to an interpretation of quantum discord as the difference in superdense coding capacities between a quantum state and the best classical state when both are produced at a source that makes a classical error during transmission.

    Details

    Item Type Articles
    CreatorsMeznaric, S., Clark, S. R. and Datta, A.
    DOI10.1103/PhysRevLett.110.070502
    Uncontrolled Keywordsquant-ph
    DepartmentsFaculty of Science > Physics
    RefereedYes
    StatusPublished
    ID Code47325
    Additional InformationPublished version, 5 pages, 3 figures plus 4 pages of Supplementary Material

    Export

    Actions (login required)

    View Item

    Document Downloads

    More statistics for this item...