A1 Refereed original research article in a scientific journal
Retrievability of information in quantum and realistic hidden-variable theories
Authors: Uola, Roope; Haapasalo, Erkka; Pellonpää, Juha-Pekka; Kuusela, Tom
Publisher: American Physical Society
Publication year: 2024
Journal: Physical Review A
Journal name in source: \pra
Article number: 062202
Volume: 109
Issue: 6
ISSN: 2469-9926
eISSN: 2469-9934
DOI: https://doi.org/10.1103/PhysRevA.109.062202
Web address : https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.062202
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/457153771
Preprint address: https://arxiv.org/abs/2212.02815
We propose a generalization of the Leggett-Garg conditions for macrorealistic behavior. Our proposal relies on relaxing the postulate of noninvasive measurability with that of retrievability of information. This leads to a strictly broader class of hidden-variable theories than those having a macrorealistic description. Crucially, whereas quantum mechanical tests of macrorealism require one to optimize over all possible state updates, for retrievability of information it suffices to use the basic Lüders state update, which is present in every quantum measurement. We show that in qubit systems the optimal retrieving protocols further relate to the fundamental precision limit of quantum theory given by Busch-Lahti-Werner error-disturbance uncertainty relations. We implement an optimal protocol using a photonic setting and report an experimental violation of the proposed generalization of macrorealism.
Downloadable publication This is an electronic reprint of the original article. |
Funding information in the publication:
Research funded by National Science Foundation (PZ00P2-202179). E.H. is funded by the National Research Foundation, Prime Minister’s Office, Singapore and the Ministry of Education, Singapore under the Research Centres of Excellence programme.