Physics – Quantum Physics
Scientific paper
2009-10-09
Physics
Quantum Physics
10 pages, 3 figures. Submitted to proceedings of PhysCon09
Scientific paper
Among the formulations of the theory of quantum measurements in continuous time, quantum trajectory theory is very suitable for the introduction of measurement based feedback and closed loop control of quantum systems. In this paper we present such a construction in the concrete case of a two-level atom stimulated by a coherent, monochromatic laser. In particular, we show how fast feedback \`a la Wiseman and Milburn can be introduced in the formulation of the theory. Then, the spectrum of the free fluorescence light is studied and typical quantum phenomena, squeezing and sub-natural line-narrowing, are presented.
Barchielli Alberto
Gregoratti Matteo
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