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This work shows how two parties A and B can securely share sequences ofrandom bits at optical speeds. A and B possess true-random physical sources andexchange random bits by using a random sequence received to cipher thefollowing one to be sent. A starting shared secret key is used and the methodcan be described as an unlimited one-time-pad extender. It is demonstrated thatthe minimum probability of error in signal determination by the eavesdroppercan be set arbitrarily close to the pure guessing level. Being based on the$M$-ry encryption protocol this method also allows for optical amplificationwithout security degradation, offering practical advantages over the BB84protocol for key distribution.Comment: 11 pages and 4 figures. This version updates the one published in PRA  68, 052307 (2003). Minor changes were made in the text and one section on  Mutual Information was adde

Fast and secure key distribution using mesoscopic coherent states of light