  Time evolution of initially prepared entangled state in the system of coupled
quantum dots has been analyzed by means of two different theoretical
approaches: equations of motion for the all orders localized electron
correlation functions, considering interference effects, and kinetic equations
for the pseudo-particle occupation numbers with constraint on the possible
physical states. Results obtained by means of different approaches were
carefully analyzed and compared with each other. Revealed direct link between
concurrence (degree of entanglement) and quantum dots pair correlation
functions allowed us to follow the changes of entanglement during time
evolution of the coupled quantum dots system. It was demonstrated that the
degree of entanglement can be controllably tuned during the time evolution of
quantum dots system.
