What are quantum particles doing before we measure them? Getting to grips with this century-old debate takes us to the heart of whether there is an objective reality
. He has taught quantum mechanics , the theory governing the microcosmic world of atoms and particles, for decades, and his students’ consternation inevitably emerges right on cue: when he reaches the part about quantum objects apparently being in several places at once.
A good place to start is with the Schrödinger equation. Developed by Erwin Schrödinger in the 1920s, it is a foundation stone of quantum theory that tells us the probability of finding a particle in a given state when we measure it. The point is that quantum mechanics is concerned with predicting the outcome of a situation – it says nothing concrete about what a particle was doing before it was measured.
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