



01256nas a2200121   4500008004100000245004400041210004200085260001500127520092000142100001601062700001901078856003701097       2013                        eng d00aA noise inequality for classical forces0 anoise inequality for classical forces  c2013/11/183 aLorentz invariance requires local interactions, with force laws such as the Coulomb interaction arising via virtual exchange of force carriers such as photons. Many have considered the possibility that, at long distances or large mass scales, this process changes in some way to lead to classical behavior. Here we hypothesize that classical behavior could be due to an inability of some force carriers to convey entanglement, a characteristic measure of nonlocal, quantum behavior. We then prove that there exists a local test that allows one to verify entanglement generation, falsifying our hypothesis. Crucially, we show that noise measurements can directly verify entanglement generation. This provides a step forward for a wide variety of experimental systems where traditional entanglement tests are challenging, including entanglement generation by gravity alone between macroscopic torsional oscillators.
1 aKafri, Dvir1 aTaylor, J., M.  uhttp://arxiv.org/abs/1311.4558v1