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Enhanced violations of Leggett-Garg inequalities in an experimental three-level system

Wang, Kunkun; Emary, Clive; Zhan, Xiang; Bian, Zhihao; Li, Jian; Xue, Peng

Authors

Kunkun Wang

Clive Emary

Xiang Zhan

Zhihao Bian

Jian Li

Peng Xue



Abstract

Leggett-Garg inequalities are tests of macroscopic realism that can be violated by quantum mechanics. In this letter, we realise photonic Leggett-Garg tests on a three-level system and implement measurements that admit three distinct measurement outcomes, rather than the usual two. In this way we obtain violations of three- and four-time Leggett-Garg inequalities that are significantly in excess of those obtainable in standard Leggett-Garg tests. We also report violations the quantum-witness equality up to the maximum permitted for a three-outcome measurement. Our results highlight differences between spatial and temporal correlations in quantum mechanics.

Citation

Wang, K., Emary, C., Zhan, X., Bian, Z., Li, J., & Xue, P. (2017). Enhanced violations of Leggett-Garg inequalities in an experimental three-level system. Optics express, 25(25), 31462-31470. https://doi.org/10.1364/OE.25.031462

Journal Article Type Article
Acceptance Date Jan 10, 2017
Online Publication Date Dec 4, 2017
Publication Date Dec 11, 2017
Deposit Date Jun 27, 2018
Publicly Available Date Jun 29, 2018
Journal Optics Express
Print ISSN 1094-4087
Electronic ISSN 1094-4087
Publisher Optica
Peer Reviewed Peer Reviewed
Volume 25
Issue 25
Pages 31462-31470
DOI https://doi.org/10.1364/OE.25.031462
Public URL https://hull-repository.worktribe.com/output/897404
Publisher URL https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-25-31462
Additional Information This article is maintained by: OSA - The Optical Society; Crossref DOI link to publisher maintained version: https://doi.org/10.1364/OE.25.031462; Article type: research-article; Similarity check: Screened by Similarity Check; Peer reviewed: Yes; Review process: Single blind; Received: 17 October 2017; Accepted: 22 November 2017; Published: 4 December 2017; Copyright: © 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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© 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement at https://www.osapublishing.org/library/license_v1.cfm#VOR-OA. Users may use, reuse, and build upon the article, or use the article
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