Leggett-Garg macrorealism and temporal correlations

Autor(en)

Giuseppe Vitagliano, Costantino Budroni

Abstrakt

Leggett and Garg formulated macrorealist models encoding our intuition on classical systems, i.e., physical quantities have a definite value that can be measured with minimal disturbance, and with the goal of testing macroscopic quantum coherence effects. The associated inequalities, involving the statistics of sequential measurements on the system, are violated by quantum-mechanical predictions and experimental observations. Such tests, however, are subject to loopholes: a classical explanation can be recovered assuming specific models of measurement disturbance. We review recent theoretical and experimental progress in characterizing macrorealist and quantum temporal correlations, and in closing loopholes associated with Leggett-Garg tests. Finally, we review recent definitions of nonclassical temporal correlations, which go beyond macrorealist models by relaxing the assumption on the measurement disturbance, and their applications in sequential quantum information processing.

Organisation(en)

Forschungsverbund Quantum Aspects of Space Time, Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Università degli Studi di Pisa, Österreichische Akademie der Wissenschaften (ÖAW), Technische Universität Wien

Journal

Physical Review A

Band

107

Anzahl der Seiten

22

ISSN

2469-9926

DOI

https://doi.org/10.1103/PhysRevA.107.040101

Publikationsdatum

04-2023

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/f8be918c-5e9e-4bcd-ad99-d10fb373e9be