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