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Experimental violation of the Leggett–Garg inequality in a three-level system

Authors :
Hemant Katiyar
Aharon Brodutch
Dawei Lu
Raymond Laflamme
Source :
New Journal of Physics, Vol 19, Iss 2, p 023033 (2017)
Publication Year :
2017
Publisher :
IOP Publishing, 2017.

Abstract

The Leggett–Garg (LG) test of macroscopic realism involves a series of dichotomic non-invasive measurements that are used to calculate a function which has a fixed upper bound for a macrorealistic system and a larger upper bound for a quantum system. The quantum upper bound depends on both the details of the measurement and the dimension of the system. Here we present an LG experiment on a three-level quantum system, which produces a larger theoretical quantum upper bound than that of a two-level quantum system. The experiment is carried out in nuclear magnetic resonance and consists of the LG test as well as a test of the ideal assumptions associated with the experiment, such as measurement non-invasiveness. The non-invasive measurements are performed via the modified ideal negative result measurement scheme on a three-level system. Once these assumptions are tested, the violation becomes small, despite the fact that the LG value itself is large. Our results showcase the advantages of using the modified measurement scheme that can reach higher LG values, since these leave a larger margin for violating the inequality in the face of experimental imperfections.

Details

Language :
English
ISSN :
13672630
Volume :
19
Issue :
2
Database :
Directory of Open Access Journals
Journal :
New Journal of Physics
Publication Type :
Academic Journal
Accession number :
edsdoj.bc509162bdb4d719497a6de45e30cc9
Document Type :
article
Full Text :
https://doi.org/10.1088/1367-2630/aa5c51