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One conundrum of quantum mechanics is how a particle occupying many states snaps to a single state when measured. One theory posits that measurement has nothing to do with this “wave-function collapse,” suggesting instead that it happens spontaneously. Now, researchers have analyzed several ways one might look for spontaneous wave-function collapse using levitated nanoparticles. Though no technique is yet up to the challenge, they identify some promising avenues for investigation.

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