Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/95108
Title: Quantum discord bounds the amount of distributed entanglement
Authors: Chuan, T. K.
Maillard, J.
Modi, K.
Paternostro, M.
Piani, M.
Paterek, Tomasz
Keywords: DRNTU::Science::Physics::Atomic physics::Quantum theory
Issue Date: 2012
Source: Chuan, T. K., Maillard, J., Modi, K., Paterek, T., Paternostro, M., & Piani, M. (2012). Quantum Discord Bounds the Amount of Distributed Entanglement. Physical Review Letters, 109(7), 070501.
Series/Report no.: Physical review letters
Abstract: The ability to distribute quantum entanglement is a prerequisite for many fundamental tests of quantum theory and numerous quantum information protocols. Two distant parties can increase the amount of entanglement between them by means of quantum communication encoded in a carrier that is sent from one party to the other. Intriguingly, entanglement can be increased even when the exchanged carrier is not entangled with the parties. However, in light of the defining property of entanglement stating that it cannot increase under classical communication, the carrier must be quantum. Here we show that, in general, the increase of relative entropy of entanglement between two remote parties is bounded by the amount of nonclassical correlations of the carrier with the parties as quantified by the relative entropy of discord. We study implications of this bound, provide new examples of entanglement distribution via unentangled states, and put further limits on this phenomenon.
URI: https://hdl.handle.net/10356/95108
http://hdl.handle.net/10220/9255
DOI: 10.1103/PhysRevLett.109.070501
Rights: © 2012 American Physical Society. This paper was published in Physical Review Letters and is made available as an electronic reprint (preprint) with permission of American Physical Society. The paper can be found at the following official DOI: [http://dx.doi.org/10.1103/PhysRevLett.109.070501]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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