# Quantum probability can't be derived without assuming it first

- Source: Phys.org
- Published: 2026-10-20T15:50:01+00:00
- Category: Science
- Original: https://phys.org/news/2026-10-quantum-probability-derived-assuming.html
- Canonical: https://groundlevelnews.com/story/quantum-probability-can-t-be-derived-without-assuming-it-first-db6c3d/

For nearly a century, physicists have relied on the Born rule to calculate the chances of different outcomes when they measure a quantum system. Yet despite decades of effort, nobody has managed to derive the rule from more basic mathematical principles without making assumptions about probability along the way.

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