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Entropy 2017, 19(3), 124; doi:10.3390/e19030124

Witnessing Multipartite Entanglement by Detecting Asymmetry

Department of Atomic and Laser Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK
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Author to whom correspondence should be addressed.
Academic Editor: Kevin H. Knuth
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)
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Abstract

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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