Please use this identifier to cite or link to this item: https://doi.org/10.1088/1367-2630/14/5/058001
Title: Comment on 'A scattering quantum circuit for measuring Bell's time inequality: A nuclear magnetic resonance demonstration using maximally mixed states'
Authors: Knee, G.C.
Gauger, E.M.
Briggs, G.A.D.
Benjamin, S.C. 
Issue Date: May-2012
Citation: Knee, G.C., Gauger, E.M., Briggs, G.A.D., Benjamin, S.C. (2012-05). Comment on 'A scattering quantum circuit for measuring Bell's time inequality: A nuclear magnetic resonance demonstration using maximally mixed states'. New Journal of Physics 14 : -. ScholarBank@NUS Repository. https://doi.org/10.1088/1367-2630/14/5/058001
Abstract: A recent paper by Souza, Oliveira and Sarthour (SOS) reports the experimental violation of a Leggett-Garg (LG) inequality (sometimes referred to as a temporal Bell inequality). The inequality tests for quantum mechanical superposition: if the inequality is violated, the dynamics cannot be explained by a large class of classical theories under the heading of macrorealism. Experimental tests of the LG inequality are beset by the difficulty of carrying out the necessary so-called 'non-invasive' measurements (which for the macrorealist will extract information from a system of interest without disturbing it). SOS argue that they nevertheless achieve this difficult goal by putting the system in a maximally mixed state. The system then allegedly undergoes no perturbation during their experiment. Unfortunately, the method is ultimately unconvincing to a skeptical macrorealist and so the conclusions drawn by SOS are unjustified. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Source Title: New Journal of Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/116269
ISSN: 13672630
DOI: 10.1088/1367-2630/14/5/058001
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