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Physicists create a 'quantum ruler' to measure the universe
A group of physicists from the Russian Quantum Center and the Moscow Institute of Physics and Technology have come up with a new method of creating a special entangled quantum state, one that could be used as "a high-precision ruler" for measuring large distances with subatomic precision. The technique, described in a new study in the journal Nature Communications, could be used to increase the sensitivity of optical interferometers like the ones used by the LIGO project to detect gravitational waves.
