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

Wang, Kunkun; Emary, Clive; Xu, Mengyan; Zhan, Xiang; Bian, Zhihao; Xiao, Lei; Xue, Peng

Authors

Kunkun Wang

Clive Emary

Mengyan Xu

Xiang Zhan

Zhihao Bian

Lei Xiao

Peng Xue



Abstract

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.

Journal Article Type Article
Publication Date Feb 5, 2018
Journal Physical Review A
Print ISSN 2469-9926
Electronic ISSN 2469-9934
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 97
Issue 2
Article Number 020101(R)
APA6 Citation Wang, K., Emary, C., Xu, M., Zhan, X., Bian, Z., Xiao, L., & Xue, P. (2018). Violations of a Leggett-Garg inequality without signaling for a photonic qutrit probed with ambiguous measurements. Physical Review A, 97(2), doi:10.1103/PhysRevA.97.020101
DOI https://doi.org/10.1103/PhysRevA.97.020101
Keywords Quantum benchmarking; Quantum information processing; Quantum information
Publisher URL https://journals.aps.org/pra/abstract/10.1103/PhysRevA.97.020101
Copyright Statement ©2018 The University of Hull

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