Channel discrimination power of bipartite quantum states

Caiaffa, Matteo and Piani, Marco (2018) Channel discrimination power of bipartite quantum states. Physical Review A - Atomic, Molecular, and Optical Physics, 97 (3). 032334. ISSN 2469-9934 (https://doi.org/10.1103/PhysRevA.97.032334)

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Abstract

We quantify the usefulness of a bipartite quantum state in the ancilla-assisted channel discrimination of arbitrary quantum channels, formally defining a worst-case-scenario channel discrimination power for bipartite quantum states. We show that such a quantifier is deeply connected with the operator Schmidt decomposition of the state. We compute the channel discrimination power exactly for pure states, and provide upper and lower bounds for general mixed states. We show that highly entangled states can outperform any state that passes the realignment criterion for separability. Furthermore, while also unentangled states can be used in ancilla-assisted channel discrimination, we show that the channel discrimination power of a state is bounded by its quantum discord.

  • Item type:Article
    ID code:63547
    Dates:
    Date
    Event
    23 March 2018
    Published
    21 February 2018
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:28 Mar 2018 10:47
    Last modified:08 Apr 2024 23:29
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/63547
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