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Objectivity (or lack thereof): Comparison between predictions of quantum Darwinism and spectrum broadcast structure

Le, TP; Olaya-Castro, A; (2018) Objectivity (or lack thereof): Comparison between predictions of quantum Darwinism and spectrum broadcast structure. Physical Review A , 98 (3) , Article 032103. 10.1103/PhysRevA.98.032103. Green open access

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Abstract

Quantum Darwinism and spectrum broadcast structure describe the emergence of objectivity in quantum systems. However, it is unclear whether these two frameworks lead to consistent predictions on the objectivity of the state of a quantum system in a given scenario. In this paper, we jointly investigate quantum Darwinism and spectrum broadcasting, as well as the subdivision of quantum Darwinism into accessible information and quantum discord, in a two-level system interacting with an N-level environment via a random matrix coupling. We propose a partial trace method to suitably and consistently partition the effective N-level environment and compare the predictions with those obtained using the partitioning method proposed by Perez [Phys. Rev. A 81, 052326 (2010)]. We find that quantum Darwinism can apparently emerge under the Perez trace even when spectrum broadcast structure does not emerge, and the majority of the quantum mutual information between system and environment fractions is in fact quantum in nature. This work therefore shows there can be discrepancies between quantum Darwinism and the nature of information and spectrum broadcast structure.

Type: Article
Title: Objectivity (or lack thereof): Comparison between predictions of quantum Darwinism and spectrum broadcast structure
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevA.98.032103
Publisher version: http://doi.org/10.1103/PhysRevA.98.032103
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 > 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/10069983
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