https://arxiv.org/abs/1303.0614In the well-known EPR paper, Einstein et al. called the nonlocal correlation in quantum entanglement as `spooky action at a distance'. If the spooky action does exist, what is its speed? All previous experiments along this direction have locality loopholes and thus can be explained without having to invoke any `spooky action' at all. Here, we strictly closed the locality loopholes by observing a 12-hour continuous violation of Bell inequality and concluded that the lower bound speed of `spooky action' was four orders of magnitude of the speed of light if the Earth's speed in any inertial reference frame was less than 10^(-3) times of the speed of light.
https://web.archive.org/web/20190701001907/
https://www.technologyreview.com/s/512281/chinese-physicists-measure-speed-of-spooky-action-at-a-distance/Now Chinese physicists have clocked it travelling more than four orders of magnitude faster than light
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