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Quantum Darwinism and contextuality

Grant number: 16/24162-8
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): June 01, 2017
Effective date (End): November 18, 2021
Field of knowledge:Physical Sciences and Mathematics - Physics
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Marcelo de Oliveira Terra Cunha
Grantee:Roberto Dobal Baldijão
Home Institution: Instituto de Matemática, Estatística e Computação Científica (IMECC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated scholarship(s):19/02221-0 - Classical Limits in Generalized Probabilistic Theories and post-Quantum Darwnism, BE.EP.DR


Contextuality is one of the features that distinguish quantum and classical theories. The incompatibility between non-contextual hidden-variable theories and quantum theory has been confirmed both theoretically and experimentally. More than nonlocality, this contradiction can be viewed as a contradiction of the structure of quantum theory with the intuition of classical theories, expressed in state independent classical inequalities which are violated by quantum theory. Interest in contextuality has grown recently, not only because of the foundational aspects it implicates, but as a candidate for efficient quantum computation resource.It is possible, not only to understand how quantum theory distinguishes itself from classical theories, but to understand how they are related. There is, nowadays, a point of view in which interacting quantum systems can behave in a way explained by classical theories. Historically, decoherence brought significant advances to this understanding. The introduction of Quantum Darwinism, by Zurek and coworkers, found explanations for objectivity and suppression of non-classical superpositions in a detailed way, refined by further developments.By considering classical theories as limits of quantum theory, is it possible to explain how dynamical quantum processes can lead to suppression of contextuality? Is it the case that inequalities violations can still occur, but, typically, are small enough to be imperceptible? Does contextuality play any role in these classical limits? The dynamical studies of contextuality, taken by the point of view of Quantum Darwinism, can connect two apparently distinct research areas, leading to contributions to both of them and this is the proposal of this project. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BORGES, G. F.; BALDIJAO, R. D.; CONDE, J. G. L.; CABRAL, J. S.; MARQUES, B.; TERRA CUNHA, M.; CABELLO, A.; PADUA, S. Automated quantum operations in photonic qutrits. Physical Review A, v. 97, n. 2 FEB 2 2018. Web of Science Citations: 1.
BALDIJAO, R. D.; BORGES, G. F.; MARQUES, B.; SOLIS-PROSSER, M. A.; NEVES, L.; PADUA, S. Proposal for automated transformations on single-photon multipath qudits. Physical Review A, v. 96, n. 3 SEP 18 2017. Web of Science Citations: 3.

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