The physical foundation of a computer, specifically, the thermodynamic and quantum mechanical limits, has been an interesting theoretical subject for many years. The uncertainty relation between information and energy, exemplified by Maxwell’s demon1), suggests that there exists a fundamental limit on minimum energy cost per unit of information processing. The most important development in this field in the last ten years has been a reversible logic proposed by Fredkin and Toffoh2).
© 1988 Optical Society of AmericaPDF Article
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