Optical properties of semiconductor quantum dots with magnetic ions coupled to metallic leads

We present here the results of the study of a quantum memory encoded in quantum states of a single magnetic ion in a semiconductor quantum dot coupled to metallic leads allowing for control of carrier concentration in a quantum dot. The electronic properties of such a complex system are described as a function of the bias applied to metallic leads, strength of tunnelling matrix element between Fermi sea in the leads and exchange interaction between electrons in a quantum dot and magnetic ions. We analyze here the optical emission process. In the initial state a photoexcited exciton is present. After the excitonic emission, the complete set of electronic states occupation of the magnetic ion couples to the electrons states in the leads. This coupling, necessary for electric manipulation of quantum memory, results in Kondo-like coupling of magnetic spin and electrons in the Fermi sea.