The microcosm, the realm of quantum physics, is ruled by probability and chance. The behavior of quantum particles cannot be predicted with certainty but only with certain probabilities given by quantum physics. This results in a so-called quantum noise, which fundamentally limits the precision of the most refined atomic clocks and interferometers. The solution to this problem is the use of entangled atomic systems. A break-through has now been achieved by researchers in Germany. For the first time, the scientists succeeded in generating multi-particle entanglement on an atom-chip.