Relativistic quantum bit commitment in real-time

A relativistic quantum exchange protocol making it possible to implement a bit commitment scheme is realized. The protocol is based on the idea that i n the relativistic case the propagation of a field into a region of space a ccessible for measurement requires, in contrast to the nonrelativistic case , a finite time that depends on the structure of the states. The protocol r equires one classical and several quantum communication channels. It turns out that it is possible in principle to preserve the secret bit for as long a period of time desired and with probability as close to 1 as desired. (C ) 2000 MAIK "Nauka/Interperiodica".