Quantum retrodiction : foundations and controversies

Barnett, Stephen M. and Jeffers, John and Pegg, David T. (2021) Quantum retrodiction : foundations and controversies. Symmetry, 13 (4). 586. ISSN 2073-8994 (https://doi.org/10.3390/sym13040586)

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Prediction is the making of statements, usually probabilistic, about future events based on current information. Retrodiction is the making of statements about past events based on current information. We present the foundations of quantum retrodiction and highlight its intimate connection with the Bayesian interpretation of probability. The close link with Bayesian methods enables us to explore controversies and misunderstandings about retrodiction that have appeared in the literature. To be clear, quantum retrodiction is universally applicable and draws its validity directly from conventional predictive quantum theory coupled with Bayes’ theorem.


Barnett, Stephen M., Jeffers, John ORCID logoORCID: https://orcid.org/0000-0002-8573-1675 and Pegg, David T.;