  We propose, experimentally realize and study possible applications of a new
type of logic element: random flip-flop. By definition it operates similarly to
a conventional flip-flop except that it functions with probability of 1/2
otherwise it does nothing. We demonstrate one practical realization of the
random flip-flop based on optical quantum random number generator and discuss
possible usages of such a device in computers, cryptographic hardware and
testing equipment.
