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Q uantum entanglement is one of the most mind-boggling phenomena predicted by quantum,physics.It says that two particles can influence each other,even though they are separated over large distances.In disbelieve,Einstein called this prediction spooky action at a distance[1].In the 1960s,Bell has demonstrated that quantum mechanics indeed seems to conflict with our classical worldview,which is local(information can be transmitted maximally with the speed of light)and realistic(properties exist prior to and independent of their measurement)[2].Over the course of the next 50 years,experimentalists have confirmed the predictions of quantum mechanics and rejected the local-realistic worldview in ever more stringent measurements[3-8].