@article{Chevalier:2021:10.1103/PhysRevA.103.043707,
author = {Chevalier, H and Paige, AJ and Kwon, H and Kim, MS},
doi = {10.1103/PhysRevA.103.043707},
journal = {Physical Review A: Atomic, Molecular and Optical Physics},
pages = {1--9},
title = {Violating the Leggett-Garg inequalities with classical light},
url = {http://dx.doi.org/10.1103/PhysRevA.103.043707},
volume = {103},
year = {2021}
}

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TY  - JOUR
AB  - In an endeavor to better define the distinction between classical macroscopic and quantum microscopic regimes, the Leggett-Garg inequalities were established as a test of macroscopic-realistic theories, which are commonly thought to be a suitable class of descriptions for classical dynamics. The relationship between their violation and nonclassicality is however not obvious. We show that classical states of light, which in the quantum optical sense are any convex sums of coherent states, may not satisfy the Leggett-Garg inequalities. After introducing a simple Mach-Zehnder setup and showing how to obtain a violation with a single photon using negative measurements, we focus on classical states of light, in particular those of low average photon number. We demonstrate how one can still perform negative measurements with an appropriate assignment of variables, and show that the inequalities are violable with coherent states. Finally, we abandon the initial phase reference and demonstrate that the violation is still possible, in particular with thermal states of light, and we investigate the effect of intermediate dephasing.
AU  - Chevalier,H
AU  - Paige,AJ
AU  - Kwon,H
AU  - Kim,MS
DO  - 10.1103/PhysRevA.103.043707
EP  - 9
PY  - 2021///
SN  - 1050-2947
SP  - 1
TI  - Violating the Leggett-Garg inequalities with classical light
T2  - Physical Review A: Atomic, Molecular and Optical Physics
UR  - http://dx.doi.org/10.1103/PhysRevA.103.043707
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000646080500007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://journals.aps.org/pra/abstract/10.1103/PhysRevA.103.043707
UR  - http://hdl.handle.net/10044/1/89152
VL  - 103
ER  - 

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