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Open Quantum Systems Decoherence Quantum Simulation Entanglement Theory Quantum Correlations

Quantum Theory Can Decohere from a Causally-Indefinite Post-Quantum Theory

arXiv
Authors: James Hefford, Matt Wilson

Year

2025

Paper ID

17640

Status

Preprint

Abstract Read

~2 min

Abstract Words

107

Citations

N/A

Abstract

We find a process satisfying the axioms of hyper-decoherence which produces standard quantum theory from the theory of quantum boxes (higher-order quantum theory with the non-signalling tensor product). This hyper-decoherence map evades the no-go theorem of Lee and Selby by relaxing constraints on signalling to the past and the uniqueness of purifications. We discuss some natural opposing conclusions: that the existence of this map might be evidence of a genuine hyper-decoherence process producing causal quantum theory from its causally-indefinite higher-order theory; or that it serves as an indication that the axioms of hyper-decoherence might need careful re-consideration, especially regarding the subtle albeit central role that purity plays.

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  • We find a process satisfying the axioms of hyper-decoherence which produces standard quantum theory from the theory of quantum boxes (higher-order quantum theory with the...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2511.02772 [2] arXiv https://arxiv.org/abs/2511.02772 [3] Publisher https://arxiv.org/abs/2511.02772

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