Power Analysis of Quantum Cellular Automata Circuits

Quantum cellular automata technology (QCA) is one of the promising nanotechnologies in future due to the prospects of extremely low power operation and reduction of interconnections. This paper discuss about energy flow equations, calculation of power dissipation for elementary QCA circuits. The upper bound power model of QCA Cell from its energy flow equations can be used to calculate power gain and power dissipation of QCA Circuits. This upper bound model can be used to find error due to the information flow in a QCA circuit. Hence power dissipation of majority gate, invertors, multiplexer and OR – serial array of QCA circuits are studied and estimated. It was found that higher power dissipation for unlikely inputs than the same type of inputs. The calculated theoretical power gain of QCA cell in or –serial array QCA circuit gives the same results and the simulation results are validated. The proposed QCA Power analysis method can be used to find the power dissipation of a complete QCA system and also to detect polarization error in any type of QCA circuits.