Budroni, C.; Vitagliano, G.; Colangelo, Gilberto; Sewell, R. J.; Gühne, O.; Tóth, G.; Mitchell, M. W. (2015). Quantum Nondemolition Measurement Enables Macroscopic Leggett-Garg Tests. Physical review letters, 115(20) American Physical Society 10.1103/PhysRevLett.115.200403
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We show how a test of macroscopic realism based on Leggett-Garg inequalities (LGIs) can be performed in a macroscopic system. Using a continuous-variable approach, we consider quantum nondemolition (QND) measurements applied to atomic ensembles undergoing magnetically driven coherent oscillation. We identify measurement schemes requiring only Gaussian states as inputs and giving a significant LGI violation with realistic experimental parameters and imperfections. The predicted violation is shown to be due to true quantum effects rather than to a classical invasivity of the measurement. Using QND measurements to tighten the “clumsiness loophole” forces the stubborn macrorealist to recreate quantum backaction in his or her account of measurement.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) 08 Faculty of Science > Institute of Theoretical Physics |
UniBE Contributor: |
Colangelo, Gilberto |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0031-9007 |
Publisher: |
American Physical Society |
Language: |
English |
Submitter: |
Esther Fiechter |
Date Deposited: |
20 Nov 2015 15:44 |
Last Modified: |
05 Dec 2022 14:50 |
Publisher DOI: |
10.1103/PhysRevLett.115.200403 |
BORIS DOI: |
10.7892/boris.73159 |
URI: |
https://boris.unibe.ch/id/eprint/73159 |
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