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We present a system to test the bistability of individual molecules for application in a QCA cell. The system presented consists of two polysilicon gate electrodes which sit adjacent to two highly-doped windows of silicon to which molecules can be bound. To enable the detection of switching activity the two highly doped regions are electrically connected to the island of a single-electron transistor...
This paper presents an overview of the electronic implementation of quantum-dot cellular automata (QCA). QCA is a computing paradigm that encodes and processes information by the position of individual electrons. This opens the possibility of dense, ultra-low power devices. Resent results are presented from QCA cells implemented using metal-dots, as well as investigations toward molecular and silicon...
In this report, we describe the fabrication and experimental demonstration of fanout in QCA. Fanout is important as it is necessary for complex digital logic circuits and is essential for generating compact designs, as multiple cells can be then driven by a single driver cell. Fanout in QCA is also a direct demonstration of power gain in QCA circuits. The device is realized using metal islands (as...
This paper reports on the dynamic behavior of power dissipation in a clocked QCA majority gate. A distributed clocking scheme is employed in the QCA array to form a "computation wave" which moves smoothly across the circuit. The quantum dynamical calculation is done with coherence vector formalism with dissipation incorporated so that we can see power flowing to the environment, and also...
Quantum-dot cellular automata (QCA), a computation paradigm based on the Coulomb interactions between neighboring cells. The key idea is to represent binary information, not by the state of a current switch (transistor), but rather by the configuration of charge in a bistable cell. In its molecular realization, the QCA cell can be a single molecule. QCA is ideally suited for molecular implementation...
We present experimental demonstration of a basic cell of Quantum-dot Cellular Automata, a transistorless computation paradigm which addresses the issues of device density and interconnection. The devices presented consist of four and six-dot quantum-dot cellular systems where the metal dots are connected by capacitors and tunnel junctions. The operation of a basic cell is confirmed by the externally...
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