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Open AccessArticle

Witnessing Multipartite Entanglement by Detecting Asymmetry

Department of Atomic and Laser Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK
Author to whom correspondence should be addressed.
Academic Editor: Kevin H. Knuth
Entropy 2017, 19(3), 124;
Received: 4 February 2017 / Revised: 8 March 2017 / Accepted: 12 March 2017 / Published: 16 March 2017
(This article belongs to the Special Issue Information Geometry II)
The characterization of quantum coherence in the context of quantum information theory and its interplay with quantum correlations is currently subject of intense study. Coherence in a Hamiltonian eigenbasis yields asymmetry, the ability of a quantum system to break a dynamical symmetry generated by the Hamiltonian. We here propose an experimental strategy to witness multipartite entanglement in many-body systems by evaluating the asymmetry with respect to an additive Hamiltonian. We test our scheme by simulating asymmetry and entanglement detection in a three-qubit Greenberger–Horne–Zeilinger (GHZ) diagonal state. View Full-Text
Keywords: quantum information; quantum coherence; entanglement; quantum metrology quantum information; quantum coherence; entanglement; quantum metrology
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Girolami, D.; Yadin, B. Witnessing Multipartite Entanglement by Detecting Asymmetry. Entropy 2017, 19, 124.

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