Digital_Logic_Gate_Using_Quantum-Dot_Cellular_Automata

Digital_Logic_Gate_Using_Quantum-Dot_Cellular_Automata -...

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DOI: 10.1126/science.284.5412.289 , 289 (1999); 284 Science et al. Islamshah Amlani, Automata Digital Logic Gate Using Quantum-Dot Cellular www.sciencemag.org (this information is current as of March 31, 2007 ): The following resources related to this article are available online at http://www.sciencemag.org/cgi/content/full/284/5412/289 version of this article at: including high-resolution figures, can be found in the online Updated information and services, 107 article(s) on the ISI Web of Science. cited by This article has been http://www.sciencemag.org/cgi/content/full/284/5412/289#otherarticles 5 articles hosted by HighWire Press; see: cited by This article has been http://www.sciencemag.org/cgi/collection/app_physics Physics, Applied : subject collections This article appears in the following http://www.sciencemag.org/about/permissions.dtl in whole or in part can be found at: this article permission to reproduce of this article or about obtaining reprints Information about obtaining registered trademark of AAAS. c 1999 by the American Association for the Advancement of Science; all rights reserved. The title SCIENCE is a Copyright American Association for the Advancement of Science, 1200 New York Avenue NW, Washington, DC 20005. Science (print ISSN 0036-8075; online ISSN 1095-9203) is published weekly, except the last week in December, by the on March 31, 2007 www.sciencemag.org Downloaded from
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Digital Logic Gate Using Quantum-Dot Cellular Automata Islamshah Amlani, 1 * Alexei O. Orlov, 1 Geza Toth, 1,2 Gary H. Bernstein, 1 Craig S. Lent, 1 Gregory L. Snider 1 A functioning logic gate based on quantum-dot cellular automata is presented, where digital data are encoded in the positions of only two electrons. The logic gate consists of a cell, composed of four dots connected in a ring by tunnel junctions, and two single-dot electrometers. The device is operated by applying inputs to the gates of the cell. The logic AND and OR operations are verified using the electrometer outputs. Theoretical simulations of the logic gate output characteristics are in excellent agreement with experiment. Field-effect transistors (FETs) are the founda- tion of present digital logic technologies such as complementary metal oxide semiconductors. Despite vast improvements in integrated circuit fabrication technology over the past three de- cades, the role played by the FET has remained that of a current switch, much like the mechan- ical relays used by Konrad Zuse in the 1930s. By adhering to strict scaling rules, FETs have maintained acceptable performance despite tre- mendous reductions in size, permitting the mi- croelectronics industries to make phenomenal increases in device density and computational power. As device feature sizes approach quan- tum limits, fundamental effects will make fur- ther scaling difficult, requiring a departure from the FET-based paradigm and necessitating rev- olutionary approaches to computing. The ap- proach must be compatible with the inherent
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Digital_Logic_Gate_Using_Quantum-Dot_Cellular_Automata -...

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