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Discriminating strength: a bona fide measure of non-classical correlations

Abstract

A new measure of non-classical correlations is introduced and characterized. It tests the ability of using a state ρ of a composite system AB as a probe for a quantum illumination task (e.g. see Lloyd 2008 Science 321 1463), in which one is asked to remotely discriminate between the two following scenarios: (i) either nothing happens to the probe, or (ii) the subsystem A is transformed via a local unitary R{sub A} whose properties are partially unspecified when producing ρ. This new measure can be seen as the discrete version of the recently introduced interferometric power measure (Girolami et al 2013 e-print arXiv:1309.1472) and, at least for the case in which A is a qubit, it is shown to coincide (up to an irrelevant scaling factor) with the local quantum uncertainty measure of Girolami, Tufarelli and Adesso (2013 Phys. Rev. Lett. 110 240402). Analytical expressions are derived which allow us to formally prove that, within the set of separable configurations, the maximum value of our non-classicality measure is achieved over the set of quantum-classical states (i.e. states ρ which admit a statistical unravelling where each element of the associated ensemble is distinguishable via local measures on B). (paper)
Authors:
Farace, A; De Pasquale, A; Giovannetti, V; [1]  Rigovacca, L [2] 
  1. NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, I-56126 Pisa (Italy)
  2. Scuola Normale Superiore, I-56126 Pisa (Italy)
Publication Date:
Jul 01, 2014
Product Type:
Journal Article
Resource Relation:
Journal Name: New Journal of Physics; Journal Volume: 16; Journal Issue: 7; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CORRELATIONS; ILLUMINANCE; QUANTUM STATES; QUBITS; QUANTUM SYSTEMS
OSTI ID:
22358944
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1367-2630; TRN: GB15P7404064121
Availability:
Available from http://dx.doi.org/10.1088/1367-2630/16/7/073010
Submitting Site:
INIS
Size:
[26 page(s)]
Announcement Date:
Jul 22, 2015

Citation Formats

Farace, A, De Pasquale, A, Giovannetti, V, and Rigovacca, L. Discriminating strength: a bona fide measure of non-classical correlations. United Kingdom: N. p., 2014. Web. doi:10.1088/1367-2630/16/7/073010.
Farace, A, De Pasquale, A, Giovannetti, V, & Rigovacca, L. Discriminating strength: a bona fide measure of non-classical correlations. United Kingdom. doi:10.1088/1367-2630/16/7/073010.
Farace, A, De Pasquale, A, Giovannetti, V, and Rigovacca, L. 2014. "Discriminating strength: a bona fide measure of non-classical correlations." United Kingdom. doi:10.1088/1367-2630/16/7/073010. https://www.osti.gov/servlets/purl/10.1088/1367-2630/16/7/073010.
@misc{etde_22358944,
title = {Discriminating strength: a bona fide measure of non-classical correlations}
author = {Farace, A, De Pasquale, A, Giovannetti, V, and Rigovacca, L}
abstractNote = {A new measure of non-classical correlations is introduced and characterized. It tests the ability of using a state ρ of a composite system AB as a probe for a quantum illumination task (e.g. see Lloyd 2008 Science 321 1463), in which one is asked to remotely discriminate between the two following scenarios: (i) either nothing happens to the probe, or (ii) the subsystem A is transformed via a local unitary R{sub A} whose properties are partially unspecified when producing ρ. This new measure can be seen as the discrete version of the recently introduced interferometric power measure (Girolami et al 2013 e-print arXiv:1309.1472) and, at least for the case in which A is a qubit, it is shown to coincide (up to an irrelevant scaling factor) with the local quantum uncertainty measure of Girolami, Tufarelli and Adesso (2013 Phys. Rev. Lett. 110 240402). Analytical expressions are derived which allow us to formally prove that, within the set of separable configurations, the maximum value of our non-classicality measure is achieved over the set of quantum-classical states (i.e. states ρ which admit a statistical unravelling where each element of the associated ensemble is distinguishable via local measures on B). (paper)}
doi = {10.1088/1367-2630/16/7/073010}
journal = {New Journal of Physics}
issue = {7}
volume = {16}
journal type = {AC}
place = {United Kingdom}
year = {2014}
month = {Jul}
}