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Strong Quantum Darwinism and Strong Independence are Equivalent to Spectrum Broadcast Structure

Le, TP; Olaya-Castro, A; (2019) Strong Quantum Darwinism and Strong Independence are Equivalent to Spectrum Broadcast Structure. Physical Review Letters , 122 (1) , Article 010403. 10.1103/PhysRevLett.122.010403. Green open access

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Abstract

How the objective everyday world emerges from the underlying quantum behavior of its microscopic constituents is an open question at the heart of the foundations of quantum mechanics. Quantum Darwinism and spectrum broadcast structure are two different frameworks providing key insight into this question. Recent works, however, indicate these two frameworks can lead to conflicting predictions on the objectivity of the state of a system interacting with an environment. Here, we provide a resolution to this issue by defining strong quantum Darwinism and proving that it is equivalent to spectrum broadcast structure when combined with strong independence of the subenvironments. We further show that strong quantum Darwinism is sufficient and necessary to signal state objectivity without the requirement of strong independence. Our Letter unveils the deep connection between strong quantum Darwinism and spectrum broadcast structure, thereby making fundamental progress toward understanding and solving the emergence of classicality from the quantum world. Together they provide us a sharper understanding of the transition in terms of state structure, geometry, and quantum and classical information.

Type: Article
Title: Strong Quantum Darwinism and Strong Independence are Equivalent to Spectrum Broadcast Structure
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.122.010403
Publisher version: http://doi.org/10.1103/PhysRevLett.122.010403
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
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/10069987
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