Robustness of coherence : an operational and observable measure of quantum coherence

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Napoli, Carmine and Bromley, Thomas R. and Cianciaruso, Marco and Piani, Marco and Johnston, Nathaniel and Adesso, Gerardo (2016) Robustness of coherence : an operational and observable measure of quantum coherence. Physical Review Letters, 116 (15). 150502. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.116.150502)

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Abstract

Quantifying coherence is an essential endeavour for both quantum foundations and quantum technologies. Here the robustness of coherence is defined and proven a full monotone in the context of the recently introduced resource theories of quantum coherence. The measure is shown to be observable, as it can be recast as the expectation value of a coherence witness operator for any quantum state. The robustness of coherence is evaluated analytically on relevant classes of states, and an ecient semidefinite program that computes it on general states is given. An operational interpretation is finally provided: the robustness of coherence quantifies the advantage enabled by a quantum state in a phase discrimination task.

ORCID iDs

Napoli, Carmine, Bromley, Thomas R., Cianciaruso, Marco, Piani, Marco ORCID logoORCID: https://orcid.org/0000-0002-4698-9497, Johnston, Nathaniel and Adesso, Gerardo;
  • Item type:Article
    ID code:56124
    Dates:
    Date
    Event
    12 April 2016
    Published
    3 March 2016
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:12 Apr 2016 11:17
    Last modified:16 Dec 2024 19:40
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/56124
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