Earth’s rotation has been measured many times over — but never like this. In a first, scientists used entangled quantum particles called photons to reveal the rate at which the globe spins.
The feat is a step toward probing one of the biggest mysteries of physics: how the tiny world of quantum physics interfaces with gravity.
This interferometer is mounted on a square frame that can rotate to allow scientists to detect Earth’s rotation or, for comparison, to be insensitive to it. Photons travel through an optical fiber 2 kilometers long that is looped around the 1.4-meter-long frame many times.Raffaele Silvestri
Scientists sent pairs of photons, particles of
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