A1 Refereed original research article in a scientific journal

Retrievability of information in quantum and realistic hidden-variable theories




AuthorsUola, Roope; Haapasalo, Erkka; Pellonpää, Juha-Pekka; Kuusela, Tom

PublisherAmerican Physical Society

Publication year2024

JournalPhysical Review A

Journal name in source\pra

Article number062202

Volume109

Issue6

ISSN2469-9926

eISSN2469-9934

DOIhttps://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 addresshttps://research.utu.fi/converis/portal/detail/Publication/457153771

Preprint addresshttps://arxiv.org/abs/2212.02815


Abstract

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.


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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.


Last updated on 2025-05-06 at 08:48