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Leggett-Garg macrorealism and the quantum nondisturbance conditions

Autor(en)
Roope Uola, Giuseppe Vitagliano, Costantino Budroni
Abstrakt

We investigate the relation between a refined version of Leggett and Garg conditions for macrorealism, namely, the no-signaling-in-time (NSIT) conditions, and the quantum mechanical notion of nondisturbance between measurements. We show that all NSIT conditions are satisfied for any state preparation if and only if certain compatibility criteria on the state-update rules relative to the measurements, i.e., quantum instruments, are met. The systematic treatment of NSIT conditions supported by structural results on nondisturbance provides a unified framework for the discussion of the the clumsiness loophole. This extends previous approaches and allows for a tightening of the loophole via a hierarchy of tests able to disprove a larger class of macrorealist theories. Finally, we discuss perspectives for a resource theory of quantum mechanical disturbance related to violations of macrorealism.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation
Externe Organisation(en)
Universität Siegen, Universität Genf, Österreichische Akademie der Wissenschaften (ÖAW)
Journal
Physical Review A
Band
100
Anzahl der Seiten
17
ISSN
2469-9926
DOI
https://doi.org/10.1103/PhysRevA.100.042117
Publikationsdatum
10-2019
Peer-reviewed
Ja
ÖFOS 2012
103025 Quantenmechanik
ASJC Scopus Sachgebiete
Atomic and Molecular Physics, and Optics
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/36fc337d-d8ed-4581-b1a0-5456ae4734c1