Redundant Records of the Past: Unifying Quantum Darwinism and Decoherent Histories

Abstract:There exist two different paradigms for records in isolated quantum systems: decoherent histories (which determines which past events leave formal records) and quantum Darwinism (which determines which current events get redundantly recorded). Neither one implies the other, and connections between the two are scarcely investigated. We unify quantum Darwinism and decoherent histories based on the insight that only redundant records about past events matter. The resulting framework of past redundancy encompasses quantum Darwinism when applied to events at the current time, and it connects redundancy to decoherence of histories and the probability sum rule via the Bhattacharyya coefficient (or fidelity). Importantly, various examples show that past redundancy is a more widespread phenomenon than the fine-tuned models necessary for quantum Darwinism suggest. We thus arrive at a richer picture in which redundancy can be caused by mechanisms different from quantum Darwinism (such as macroevents or cascade structures), which emphasizes that redundancy is necessary but not sufficient for objectivity, and which, overall, allows to realistically investigate the question: how generic is redundancy in nature?

I do not permit the use of this work for AI training without my explicit consent. 21 pages in total incl. 10 figures, 99 references, and 2.5 pages appendix. Comments are welcome!

Quantum Physics (quant-ph); Statistical Mechanics (cond-mat.stat-mech); General Relativity and Quantum Cosmology (gr-qc)

arXiv:2610.09845 [quant-ph]

(or arXiv:2610.09845v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.09845 arXiv-issued DOI via DataCite (pending registration)