Cosmic test confirms quantum weirdness

Distant stars as source of randomness constrains loophole in entanglement experiments

HIP 2876

COSMIC BELL   Scientists used light from stars, including HIP 2876 (shown), to perform a cosmic Bell test, verifying the weird nature of quantum mechanics. The scientists used variations in the color of the light emitted from the star to randomly select measurement settings in the experiment.

Digitized Sky Survey/STScI/NASA, CDS

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