Non-Markovian correlation spectra and quantum stochastic trajectory analysis of spontaneous emission of an excited two-level atom - art. no. 043810

The non-Markovian correlation spectra of spontaneous emission of an excited two-level atom are derived including the effect of finite size of the atom and all the possible contribution of allowed multipole radiations. The emi ssion process is then analyzed by the quantum stochastic trajectory approac h. The non-Markovian effect is counted in by expanding the original system to an enlarged system with Markovian reservoirs. In the case of a hydrogenl ike atom with large atomic number Z. the deviation from the Weisskopf-Wigne r result is quite evident.