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Measures and applications of quantum correlations

Adesso, Gerardo; Bromley, Thomas R.; Cianciaruso, Marco

Authors

Thomas R. Bromley

Marco Cianciaruso



Abstract

Quantum information theory is built upon the realisation that quantum resources like coherence and entanglement can be exploited for novel or enhanced ways of transmitting and manipulating information, such as quantum cryptography, teleportation, and quantum computing. We now know that there is potentially much more than entanglement behind the power of quantum information processing. There exist more general forms of non-classical correlations, stemming from fundamental principles such as the necessary disturbance induced by a local measurement, or the persistence of quantum coherence in all possible local bases. These signatures can be identified and are resilient in almost all quantum states, and have been linked to the enhanced performance of certain quantum protocols over classical ones in noisy conditions. Their presence represents, among other things, one of the most essential manifestations of quantumness in cooperative systems, from the subatomic to the macroscopic domain. In this work we give an overview of the current quest for a proper understanding and characterisation of the frontier between classical and quantum correlations (QCs) in composite states. We focus on various approaches to define and quantify general QCs, based on different yet interlinked physical perspectives, and comment on the operational significance of the ensuing measures for quantum technology tasks such as information encoding, distribution, discrimination and metrology. We then provide a broader outlook of a few applications in which quantumness beyond entanglement looks fit to play a key role.

Journal Article Type Article
Publication Date Nov 3, 2016
Journal Journal of Physics A: Mathematical and Theoretical
Print ISSN 1751-8113
Electronic ISSN 1751-8113
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 49
Issue 47
APA6 Citation Adesso, G., Bromley, T. R., & Cianciaruso, M. (2016). Measures and applications of quantum correlations. Journal of Physics A: Mathematical and Theoretical, 49(47), https://doi.org/10.1088/1751-8113/49/47/473001
DOI https://doi.org/10.1088/1751-8113/49/47/473001
Keywords Quantum correlations, quantum discord, quantum technologies
Publisher URL http://dx.doi.org/10.1088/1751-8113/49/47/473001
Related Public URLs https://arxiv.org/abs/1605.00806
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is an author-created, un-copyedited version of an article accepted for publication/published in Journal of Physics A: Mathematical and Theoretical. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/1751-8113/49/47/473001 .

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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