Quantum Zeno effect in quantum chaotic rotators - art. no. 052104

We analyzed the effect of frequent measurements on the quantum systems that are chaotic in the classical limit. It is shown that the delta-kicked rota tor, a well-known example of quantum chaos, is too special to be used as a testing ground for the effects of the repeated measurements. The abrupt cha nge of state vectors by the delta -function kick singular interruptions cau ses a quantum anti-Zeno effect. However, in more realistic rotators with in teraction potentials of continuous time dependence, the quantum Zeno effect prevails.