Bistable saturation in coupled quantum-dot cells

Model quantum dot cells are investigated as potential building blocks for quantum cellular automata architectures. Each cell holds a few electrons and interacts Coulombically with nearby cells. In acceptable cell designs, the charge density tends to align along one of two cell axes. Thus, a cell ‘‘p...

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Bibliographic Details
Published in:Journal of applied physics 1993-09, Vol.74 (5), p.3558-3566
Main Authors: TOUGAW, P. D, LENT, C. S, POROD, W
Format: Article
Language:English
Subjects:
Applied sciences
Automata. Abstract machines. Turing machines
Computer science
control theory
systems
Exact sciences and technology
Theoretical computing
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Summary:Model quantum dot cells are investigated as potential building blocks for quantum cellular automata architectures. Each cell holds a few electrons and interacts Coulombically with nearby cells. In acceptable cell designs, the charge density tends to align along one of two cell axes. Thus, a cell ‘‘polarization,’’ which can be used to encode binary information, is defined. The polarization of a cell is affected in a very nonlinear manner by the polarization of its neighbors. This interaction is quantified by calculating a cell–cell response function. Effects of nonzero temperature on the response of a model cell are investigated. The effects of multiple neighbors on a cell are examined and programmable logic gate structures based on these ideas are discussed.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.354535