Quantum Entanglement Really Is Spooky

Friday, June 20, 2008 | 17:51

A new experiment, the first spatially separated Bell test under the Penrose-Diosi assumption (a quantum measurement is finished after a macroscopic mass has moved), shows that quantum entanglement cannot be explained by any kind of communication between entangled particles:

In their experiment, the physicists sent pairs of entangled photons from Geneva through optical fibers leading to interferometers in two other Swiss towns: Satigny and Jussy, located 8.2 and 10.7 km away, respectively. The distance between the interferometers in Satigny and Jussy was 18 km. […]

All of the steps - from photon detection to mirror movement - take about 7.1 microseconds, which is significantly less than the 60 microseconds it would take a photon to cover the 18 km between interferometers. So measurements made simultaneously at each of the interferometers could not be been influenced by anything traveling at - or even a few times more than - the speed of light. #

The reality of quantum nonlocality has once again been confirmed.