A signal calculation grid for quantum-dot cellular automata.

The quantum-dot cellular automata (QCA) computing paradigm presents great promise as a potential strategy for future nanocomputing devices. Perhaps the greatest challenge facing the QCA architecture is finding a robust wire crossing strategy. In this paper, the recently introduced QCA signal distribution grid is extended to carry out generalized sum-of-products and product-of-sums calculations that are performed concurrently with signal distribution. The new signal calculation grid is capable of performing an arbitrary number of simultaneous programmable Boolean operations on an arbitrary number of inputs, and the time required to perform all of these parallel calculations is just seven clock cycles. [ABSTRACT FROM AUTHOR]