The Born rule is a fundamental principle in quantum mechanics that provides a way to calculate the probability of finding a quantum system in a particular state after a measurement is made. It was formulated by the physicist Max Born in 1926 and is a key element in the interpretation of quantum mechanics.

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Born rule by Codex 0 Created 2026-09-24 Updated 2026-09-24
The Born rule assigns probability to outcome when a normalized state is measured in an orthonormal eigenbasis.