Bounding the speed of `spooky action at a distance'

Abstract

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.

11 pages, 4 figures

References in corpus (4)

• A wavelength-tunable fiber-coupled source of narrowband entangled photons
• Testing spooky action at a distance
• Experimental Quantum Secret Sharing and Third-Man Quantum Cryptography
• A lower bound for the velocity of quantum communications in the preferred frame

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