Quantum Zeno-like effect due to competing decoherence mechanisms

Abstract

We propose a selfconsistent quantum mechanical approach to study the dynamics of a two-level system subject to random time evolution. This randomness gives rise to competing effects between dissipative and non-dissipative decoherence with a consequent slow down of the atomic decay rate.

4 pages, ReVTeX file, 2 eps figures, to appear in Phys. Rev. A