Quantum-dot Cellular Automata (QCA) is an emerging and promising technology that provides significant improvements over CMOS. Recently QCA has been advocated as an applicant for implementing reversible circuits. However QCA, like other Nanotechnologies, suffers from a high fault rate. The main purpose of this paper is to develop a fault tolerant model of QCA circuits by redundancy in hardware a...

Quantum-dot cellular automata (QCA) is a novel and potentially attractive technology for implementing computing architectures at the nano-scale. By applying a set of simple layout rules, arbitrary circuits can be made using QCA cells. In this work, we describe the design and layout of a QCA random access memory (RAM), showing the layout of individual memory cells, as well as, a suggested layout...

This article describes the design of ultra-low-power multipliers on quantumdot cellular automata (QCA) nanotechnology, promising very dense circuits and high operating frequencies, using a single homogeneous layer of the basic cells. We construct structures without the earlier noise problems, verified by the QCADesigner coherence vector simulation. Our results show that the wiring overhead of t...

We consider the effects of interaction with the environment on decoherence in quantum-dot cellular automata (QCA). We model the environment as a Coulombically interacting random assembly of quantum double-dots. The time evolution of our model system þ environment is unitary and maintains one coherent state. We explicitly calculate the reduced density operators for the system and for the environ...

The use of buried dopants to construct quantum-dot cellular automata is investigated as an alternative to conventional electronic devices for information transport and elementary computation. This provides a limit in terms of miniaturization for this type of system as each potential well is formed by a single dopant atom. As an example, phosphorous donors in silicon are found to have good energ...

We present an experimental demonstration of a fanout gate for quantum-dot cellular automata (QCA), where a signal applied to a single input cell is amplified by that cell and sent to two output cells. Each cell is a single-electron latch composed of three metal dots, which are connected in series by tunnel junctions. Binary information is represented by an excess electron localized to one of th...