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An orbiting atom interferometer spent 280 days comparing how two rubidium isotopes fall
A team led by Mingsheng Zhan compared the freefall of two rubidium isotopes aboard the China Space Station. The 2.8 x 10^-8 uncertainty they report is the best any quantum test has managed. It is also well short of what macroscopic experiments already do.
Publishers:physicsworld.com
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