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  From micro- to macrorealism: addressing experimental clumsiness with semi-weak measurements

Pandey, D., Oriols, X., & Albareda Piquer, G. (2020). From micro- to macrorealism: addressing experimental clumsiness with semi-weak measurements. New Journal of Physics, 22(7): 073047. doi:10.1088/1367-2630/ab9ae1.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-E337-C Version Permalink: http://hdl.handle.net/21.11116/0000-0007-4040-8
Genre: Journal Article

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Pandey_2020_New_J._Phys._22_073047.pdf (Publisher version), 3MB
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Pandey_2020_New_J._Phys._22_073047.pdf
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Open Access. - Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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2020
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© the Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft

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https://dx.doi.org/10.1088/1367-2630/ab9ae1 (Publisher version)
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Locator:
https://arxiv.org/abs/1901.06183 (Preprint)
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 Creators:
Pandey, D.1, Author
Oriols, X.1, Author
Albareda Piquer, G.1, 2, 3, Author              
Affiliations:
1Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
3Institute of Theoretical and Computational Chemistry, Universitat de Barcelona, ou_persistent22              

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 Abstract: We propose a protocol that allows to assess the precise correspondence between thought and practical experiments, a critical point for addressing experimental clumsiness in a test of macro- or micro-realism. Two-time generalized von Neumann measurements of properties $\mathcal{A}$ and $\mathcal{B}$ are shown to obey the so-called no-signaling in time condition for initial states defined as an incoherent sum of eigenstates of $\mathcal{A}$. An experiment for witnessing the use of this type of measurements in the laboratory is then devised by proving the existence of five conditions that have to be fulfilled by any generalized von Neumann measurement. Ensuring the use of this type of measurements and then testing the no-signaling in time condition for a range of system-meter coupling strengths allows to test realism in a highly reproducible manner and to critically narrow the so-called clumsiness loophole. The resulting protocol is applicable to general (not only dichotomic) variables, and it is employed to show, both analytically for general systems and numerically for a collection of harmonic oscillators, that quantum systems made of a large number of uncorrelated particles are genuinely macrorealist, i.e., realistic with respect to all intensive properties at any time.

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Language(s): eng - English
 Dates: 2020-05-212019-12-302020-06-092020-07-27
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1367-2630/ab9ae1
arXiv: 1901.06183
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Project name : -
Grant ID : 785219
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : -
Grant ID : 765426
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : -
Grant ID : 752822
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

Source 1

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Title: New Journal of Physics
  Abbreviation : New J. Phys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 22 (7) Sequence Number: 073047 Start / End Page: - Identifier: ISSN: 1367-2630
CoNE: https://pure.mpg.de/cone/journals/resource/954926913666