We present a numerical study of fault tolerance properties in quantum-dot cellular automata (QCA) devices. A full-basis quantum method is used for calculations of the Hamiltonian, and a statistical model has been introduced to simulate the influence of position defects of the dots within cells on the logical output. Combined effects of temperature and cell defects on a shift register have been studied. Uniform and normal distributions have been used for the cell defect simulations. Normal distribution simulations produce realistic results compared to the uniform distribution. In order to show the operational limit of a device, parameters such as “displacement factor” and “success rate” are introduced. Results show that the fault tolerance of a QCA device is strongly dependent on temperature as well as on the cell defects. The robustness of a shift register is also dependent on the size of the device.
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1 November 2005
Research Article|
November 09 2005
Fault tolerance calculations for clocked quantum-dot cellular automata devices
M. Khatun;
M. Khatun
Department of Physics and Astronomy, Center for Computational Nanoscience,
Ball State University
, Muncie, Indiana 47306
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T. Barclay;
T. Barclay
Department of Physics and Astronomy, Center for Computational Nanoscience,
Ball State University
, Muncie, Indiana 47306
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I. Sturzu;
I. Sturzu
a)
Department of Physics and Astronomy, Center for Computational Nanoscience,
Ball State University
, Muncie, Indiana 47306
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P. D. Tougaw
P. D. Tougaw
Department of Electrical and Computer Engineering,
Valparaiso University
, Valparaiso, Indiana 46383
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a)
Electronic mail: [email protected]
J. Appl. Phys. 98, 094904 (2005)
Article history
Received:
June 22 2005
Accepted:
September 27 2005
Citation
M. Khatun, T. Barclay, I. Sturzu, P. D. Tougaw; Fault tolerance calculations for clocked quantum-dot cellular automata devices. J. Appl. Phys. 1 November 2005; 98 (9): 094904. https://doi.org/10.1063/1.2128473
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