Kuantum foton alanları arasında bilgi aktarımı, döngüsel kuantum sistemleri bir topluluk birleştiğinde

We study interaction of quantum electromagnetic (EM) fields with an ensemble of Delta-type three-level quantum systems driven by a classical EM field. This system is considered to be promising for quantum information applications, in particular for implementing quantum repeater protocols in long distance quantum communications.We further develop a critical review and generalizations of canonical (Fröhlich) Transformations, which is frequently used in the analysis of such complicated quantum optical models in terms of simpler effective models. Next, we construct a method to find time-evolution of the quantum fields, based on which we demonstrate quantum information transfer between the fields. Our results are applicable for any number of atoms in the ensemble and for large coupling of atoms to classical field, relative to the quantum fields. The previous studies assumed both the atom number and the relative classical coupling to be infinitely large. Thus we relaxed these conditions, which is physically too restrictive.Finally, we discuss possible further developments of this work, and suggest the other cases for which application of this method could be fruitful.