Numerical Simulations in Quantum-dot Cellular Automata Devices

Fault tolerance simulations for Quantum-dot Cellular Automata (QCA) devices will be presented. A Full basis quantum calculation and Intercellular Hartree Approximation have been implemented using an extended Hubbard model. We have studied manufacturing as well as operational defects for wires and shift registers. Cell defects have been simulated by uniform and normal distributions. Results show temperature dependence of the breakdown displacement factor. A comparison of the results for uniform and normal distribution will be shown.