1. A nanomechanical logic device comprising: a single crystal nanomechanical resonator operating in a nonlinear frequency regime having two different vibrational steady states; first bias means applied to the resonator for inducing the two vibrational steady states with a controllable drive signal thereby creating the two vibrational steady states representing different logic states having a logic value as an output; second bias means for applying noise to the resonator; and logic signal input bias means applied to the resonator for producing a modulation of the nonlinear frequency regime which, with the presence of the noise, induces switching between the two vibrational steady states and changing the logic value of the output.