Born rule

The Born rule is a fundamental principle in quantum mechanics that explains how we determine the likelihood of finding a particle, like an electron, in a specific location or state. It states that the probability is proportional to the square of the particle's wave function's amplitude at that point. In other words, if the wave function describes the particle's behavior, squaring its value gives the chance of detecting the particle there. This rule bridges the mathematical description of quantum systems with real-world measurements, guiding us on where particles are most likely to be observed.