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Violations of a Leggett-Garg inequality without signaling for a photonic qutrit probed with ambiguous measurements

Lookup NU author(s): Dr Clive Emary



This is the final published version of an article that has been published in its final definitive form by American Physical Society, 2018.

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© 2018 American Physical Society. We realize a quantum three-level system with photons distributed among three different spatial and polarization modes. Ambiguous measurements of the state of the qutrit are realized by blocking one out for the three modes at any one time. Using these measurements we construct a test of a Leggett-Garg inequality as well as tests of no-signaling-in-time for the measurements. We observe violations of the Leggett-Garg inequality that cannot be accounted for in terms of signaling. Moreover, we tailor the qutrit dynamics such that both ambiguous and unambiguous measurements are simultaneously nonsignaling, which is an essential step for the justification of the use of ambiguous measurements in Leggett-Garg tests.

Publication metadata

Author(s): Wang K, Emary C, Xu M, Zhan X, Bian Z, Xiao L, Xue P

Publication type: Article

Publication status: Published

Journal: Physical Review A

Year: 2018

Volume: 97

Issue: 2

Online publication date: 05/02/2018

Acceptance date: 02/04/2016

Date deposited: 10/04/2018

ISSN (print): 2469-9926

ISSN (electronic): 2469-9934

Publisher: American Physical Society


DOI: 10.1103/PhysRevA.97.020101


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