Experimental test of contextuality in quantum and classical systems

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Title: Experimental test of contextuality in quantum and classical systems
Authors: Zhang, A
Xu, H
Xie, J
Zhang, H
Smith, BJ
Kim, MS
Zhang, L
Item Type: Journal Article
Abstract: Contextuality is considered as an intrinsic signature of nonclassicality and a crucial resource for achieving unique advantages of quantum information processing. However, recently, there have been debates on whether classical fields may also demonstrate contextuality. Here, we experimentally configure a contextuality test for optical fields, adopting various definitions of measurement events, and analyze how the definitions affect the emergence of nonclassical correlations. The heralded single-photon state, which is a typical nonclassical light field, manifests contextuality in our setup; whereas contextuality for classical coherent fields strongly depends on the specific definition of measurement events, which is equivalent to filtering the nonclassical component of the input state. Our results highlight the importance of the definition of measurement events to demonstrate contextuality, and they link the contextual correlations to nonclassicality defined by quasiprobabilities in phase space.
Issue Date: 1-Mar-2019
Date of Acceptance: 1-Feb-2019
ISSN: 0031-9007
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 122
Issue: 8
Copyright Statement: © 2019 American Physical Society.
Sponsor/Funder: Engineering & Physical Science Research Council (E
The Royal Society
Samsung Electronics Co. Ltd
Korea Institute of Science and Technology
Funder's Grant Number: EP/K034480/1
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
02 Physical Sciences
General Physics
Publication Status: Published
Article Number: 080401
Online Publication Date: 2019-02-26
Appears in Collections:Quantum Optics and Laser Science
Faculty of Natural Sciences

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