Bounding the speed of `spooky action at a distance'
Juan Yin, Yuan Cao, Hai-Lin Yong, Ji-Gang Ren, Hao Liang, Sheng‐Kai Liao, Fei Zhou, Chang Liu, Wu, Yu-Ping, Ge-Sheng Pan, Qiang Zhang, Chengzhi Peng, Jian-Wei Pan · arXiv (Cornell University) · 2013
In 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.