Getting formal about quantum mechanics' lack of causality

Ars Technica
By John TimmerMar 28, 2026, 8:00 am117 pts
Over a decade ago, when I was first starting to pretend I could write about quantum mechanics, I covered a truly bizarre experiment. One half of a pair of entangled photons was sent through a device it could navigate as either a particle or a wave. After it was clear of the device, the other half of the pair…

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