Comment on 'A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states'
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...
| Main Authors: | , , , |
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| Format: | Journal article |
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IOP Publishing
2012
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| _version_ | 1826257407351717888 |
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| author | Knee, G Gauger, E Briggs, G Benjamin, S |
| author_facet | Knee, G Gauger, E Briggs, G Benjamin, S |
| author_sort | Knee, G |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-06T18:17:41Z |
| format | Journal article |
| id | oxford-uuid:052f10d7-a1bf-4d6b-897e-3a7579713325 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T18:17:41Z |
| publishDate | 2012 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:052f10d7-a1bf-4d6b-897e-3a75797133252022-03-26T08:55:50ZComment on 'A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states'Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:052f10d7-a1bf-4d6b-897e-3a7579713325Symplectic Elements at OxfordIOP Publishing2012Knee, GGauger, EBriggs, GBenjamin, SA 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. |
| spellingShingle | Knee, G Gauger, E Briggs, G Benjamin, S Comment on 'A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states' |
| title | Comment on 'A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states' |
| title_full | Comment on 'A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states' |
| title_fullStr | Comment on 'A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states' |
| title_full_unstemmed | Comment on 'A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states' |
| title_short | Comment on 'A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states' |
| title_sort | comment on a scattering quantum circuit for measuring bell s time inequality a nuclear magnetic resonance demonstration using maximally mixed states |
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