Nochmal was zu dem angeschnittenen Experiment hier im Thread:
The experiment
Most previous Bell-experiments have used the simplest set up, with two laboratories, each with one photon and the two photons in an entangled state.Ronald Hanson and colleagues have succeeded in making their experiment loophole-free by using three laboratories, in a line of length 1.3km.
In the laboratories at either ends, Alice and Bob create an entangled state between a photon and an electron, keep their electron (in a diamond lattice) and send their photons to the laboratory in the middle (which I will personify as Juanita). Alice and Bob then each choose a setting and measure their electrons while Juanita performs a joint measurement on the two photons.
Alice and Bob's measurements can be done efficiently, but Juanita's, involving photons, is actually very inefficient. But it can be shown that this does not open a loophole, because Juanita does not make any measurement choice but rather always measures the two photons in the same way.
Read more at:
http://phys.org/news/2015-10-univers...antum.html#jCp
Ist j. die
QM Bomben-Bomben-Bombensicher?