Physicists at The Australian National University have conducted John Wheeler's delayed-choice thought experiment, which involves a moving object that is given the choice to act like a particle or a wave. Wheeler's experiment then asks — at which point does the object decide? Common sense says the object is either wave-like or particle-like,
independent of how we measure it. But quantum physics predicts that
whether you observe wave like behavior (interference) or particle
behavior (no interference) depends only on how it is actually measured
at the end of its journey.
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