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Witnessing non-objectivity in the framework of strong quantum Darwinism

Le, TP; Olaya-Castro, A; (2020) Witnessing non-objectivity in the framework of strong quantum Darwinism. Quantum Science and Technology , 5 (4) , Article 045012. 10.1088/2058-9565/abac4e. Green open access

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Abstract

Quantum Darwinism is a compelling theory that describes the quantum-to classical transition as the emergence of objectivity of quantum systems. Spectrum broadcast structure and strong quantum Darwinism are two extensions of this theory with emphasis on state structure and information respectively. The complete experimental verification of these three frameworks, however, requires quantum state tomography over both the system and accessible environments, thus limiting the feasibility and scalability of experimental tests. Here, we introduce a subspace-dependent objectivity operation and construct a witness that detects non-objectivity by comparing the dynamics of the system-environment state with and without the objectivity operation. We then propose a photonic experimental simulation that implements the witnessing scheme. Our work proposes a route to further experimental exploration of the quantum to classical transition.

Type: Article
Title: Witnessing non-objectivity in the framework of strong quantum Darwinism
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/2058-9565/abac4e
Publisher version: https://doi.org/10.1088/2058-9565/abac4e
Language: English
Additional information: © 2020 IOP Publishing. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (https://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10110614
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