Quantum logic as reversible computing
Abstract
The relation between entropy and information has great significance for computation. Based on the strict reversibility of the laws of microphysics, Landauer (1961), Bennett (1973), Priese (1976), Fredkin and Toffoli (1982), Feynman (1985) and others envisioned a reversible computer that cannot allow any ambiguity in backward steps of a calculation. It is this backward capacity that makes reversible computing radically different from ordinary, irreversible computing. The proposal aims at a higher kind of computer that would give the actual output of a computation together with the original input, with the absence of a minimum energy requirement. Hence, information retrievability and energy efficiency due to diminished heat dissipation are the exquisite tasks of quantum computer technology.
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