  If the information is encoded into the state of the subsystem $S$ of a
quantum system initially (at $t=0$), then it becomes distributed over the whole
quantum system at $t>0$ due to the quantum interactions. Consequently, this
information, in general, can be extracted, either completely or partially, from
any subsystem of a quantum system. {We suggest a method of extraction of
information, which is based on the polarization measurements on the receiver
$R$}.
