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Bell Visibility over Astronomical Baselines: How Much Fundamental Decoherence a Loophole-Free Test Can Tolerate

Year: 2026

Type: article

Abstract: This paper calculates the visibility threshold for a Clauser–Horne–Shimony–Holt violation and converts it into the largest fundamental decoherence rate compatible with a violation over astronomical baselines. Violation requires visibility above 0.7071. Over a million-light-year baseline the decoherence rate must lie below 1.098e-14 per second; over a billion-light-year baseline below 1.098e-17 per second. These are demanding but purely kinematic tolerances: any observed violation at such baselines would bound decoherence at these levels, while a null result could not distinguish fundamental decoherence from ordinary loss without a full noise budget. The study is simulated and computed from stated assumptions; it is not a measurement.

Source: Zenodo (CERN European Organization for Nuclear Research)

DOI: 10.5281/zenodo.24145205

Author: Aldred, William Alexander

Language: English

Topic: Quantum Mechanics and Applications

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W7225796219

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