Causal Emergence in Quantum Mechanics
Abstract
Causal emergence is brought about when a coarse-grained description of a physical system is more effective (more deterministic and/or less degenerate) than the fine-grained corresponding model. We show, for the first time to our knowledge, a causal emergence in a quantum system: a atomic Mach-Zehnder interferometer with two which-path detectors. The atomic wave-like or particle-like descriptions are related, respectively, to \textit{coarse-grained} and \textit{fine-grained} models. The predictions of the atomic position after the passage through the interferometer when the to \textit{coarse-grained} description is considered are more effective than the corresponding \textit{fine-grained} model. We conclude that quantum eraser measurements yields the causal emergence in this system.
Keywords
Cite
@article{arxiv.1901.07471,
title = {Causal Emergence in Quantum Mechanics},
author = {Romeu Rossi and Leonardo A. M. Souza},
journal= {arXiv preprint arXiv:1901.07471},
year = {2019}
}