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"Quntum-dot Cellular Automata" icon

Quntum-dot Cellular Automata

The multiple challenges presented by the problem of scaling transistor sizes are all related to the fact that transistors encode binary information by the state of a current switch. What is required is a new paradigm, still capable of providing general purpose digital computation, but which can be scaled down to the ultimate limits of molecular size. The quantum-dot cellular automata (QCA) approach encodes binary signals by the arrangement of charge inside a cell composed of several quantum dots. No current flows from cell to cell or from power supply to ground. A clocking voltage provides energy to produce power gain, which restores signals. It has been shown that logic, memory, and general purpose digital computing can all be implemented in this scheme. Power dissipation is predicted to... Show More


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