  The possibility of a new type of computing, where thermal noise is the
information carrier and the clock in a computer, is studied. The information
channel capacity and the lower limit of energy requirement/dissipation are
studied in a simple digital system with zero threshold voltage, for the case of
error probability close to 0.5, when the thermal noise is equal to or greater
than the digital signal. In a simple hypothetical realization of a thermal
noise driven gate, the lower limit of energy needed to generate the digital
signal is 1.1*kT/bit. The arrangement has potentially improved energy
efficiency and it is free of leakage current, crosstalk and ground plane
electromagnetic interference problems. Disadvantage is the large number of
redundancy elements needed for low-error operation.
