Nanocomputing channel fidelity of QCA code converter circuits under thermal randomness

摘要

The signal propagation and logical operations performed by the electrostatic interaction between the nanodots belonging to the quantum cellular automata (QCA) cells of different polarizations are influenced by the environmental noise like temperature fluctuations. The effect of thermal randomness on the computational fidelity of QCA-based 4-bit binary-to-Gray and binary-to-excess-3 code converters is studied in this article. The fidelity of computation of these digital circuits in the presence of noise is calculated by applying Shannon's information-theoretic measures, and thus, the robustness of the quantum cellular automata circuits to thermal noise is estimated. Finally, the temperature range over which the semiconductor quantum cellular automata circuits yield reliable computation is indicated. The proposed converters have minimum number of clock zones and high device density.