Measures and applications of quantum correlations

Adesso, Gerardo and Bromley, Thomas R. and Cianciaruso, Marco (2016) Measures and applications of quantum correlations. Journal of Physics A: Mathematical and Theoretical, 49 (47). p. 473001. ISSN 1751-8113

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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.

Item Type: Article
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 .
Keywords: Quantum correlations, quantum discord, quantum technologies
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Mathematical Sciences
Identification Number: https://doi.org/10.1088/1751-8113/49/47/473001
Related URLs:
URLURL Type
https://arxiv.org/abs/1605.00806UNSPECIFIED
Depositing User: Adesso, Gerardo
Date Deposited: 24 Feb 2017 10:39
Last Modified: 25 Feb 2017 06:38
URI: http://eprints.nottingham.ac.uk/id/eprint/40782

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