Transmission capability of a sequential relativistic quantum communication channel with limited observation time

It is shown that the identity of particles must inevitably be taken into account, because states in quantum field theory are nonlocalizable. This circumstance, together with finite limiting velocity, is responsible for the asymptotic character of formulas for the transmission capability of nonrelativistic communication channels (they are formally valid only for infinite time delay between messages, when the identity of particles is negligible, and, correspondingly, for infinitely slow transmission in time-bits per second per message). The transmission capability of a sequential relativistic quantum communication channel is obtained in real time with allowance for the identity of particles.