system to the information

Application of the discrete quantum–classical system to the information transfer. Abstract Discussion about properties of a transmitter is performed. It gives the possibility to qualify the quality of a transmition. The main idea of this paper is to investigate the influence of detectors onto the information transfer. The detector model is described within the open system theory using the event–enhanced quantum theory. The special attention is paid to the role of the classical part of the coupled quantum–classical system. The theory of quantum–classical detectors is developed and the optimization of the detectors is performed. The measurement device with the 100% efficiency is described. Additionally the detector which efficiency does not depend on the number of distinguishable states is obtained. A new approach to the coding problem is proposed. The coding is based on the measurement events instead of the mathematical features of the quantum theory. Within this approach the optimum coding is proposed. Finally the whole system is examined and it is shown that the amount of quantum states required for a information transfer is about tens.