Quantum jumps and open systems - from positive to negative probabilities and back

Quantum jumps can be used to describe the evolution of single quantum systems as several experiments have demonstrated. Typically jumps occur in open quantum systems, where the system under study is interacting with its environment. One example is an atom coupled to the electromagnetic modes of the universe. For structured reservoirs short-time dynamics is non-Markovian, and in some cases the identification of jump processes is hampered by the fact that jump probabilities become time-dependent and can have negative values. I shall review the experimental and theoretical concepts of quantum jumps, and then I present a novel method for the treatment of non-Markovian evolution as an ensemble of quantum jump histories.


Slides (PDF)