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26 November 2020
 
  » arxiv » quant-ph/9703022

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Reversibility and Adiabatic Computation: Trading Time and Space for Energy
Ming Li ; Paul Vitanyi ;
Date 13 Mar 1997
Journal Proc. Royal Society of London, Series A, 452(1996), 769-789
Subject Quantum Physics; Computational Complexity; Computational Engineering, Finance, and Science; Data Structures and Algorithms | quant-ph cs.CC cs.CE cs.DS
AffiliationUniversity of Waterloo), Paul Vitanyi (CWI and University of Amsterdam
AbstractFuture miniaturization and mobilization of computing devices requires energy parsimonious `adiabatic’ computation. This is contingent on logical reversibility of computation. An example is the idea of quantum computations which are reversible except for the irreversible observation steps. We propose to study quantitatively the exchange of computational resources like time and space for irreversibility in computations. Reversible simulations of irreversible computations are memory intensive. Such (polynomial time) simulations are analysed here in terms of `reversible’ pebble games. We show that Bennett’s pebbling strategy uses least additional space for the greatest number of simulated steps. We derive a trade-off for storage space versus irreversible erasure. Next we consider reversible computation itself. An alternative proof is provided for the precise expression of the ultimate irreversibility cost of an otherwise reversible computation without restrictions on time and space use. A time-irreversibility trade-off hierarchy in the exponential time region is exhibited. Finally, extreme time-irreversibility trade-offs for reversible computations in the thoroughly unrealistic range of computable versus noncomputable time-bounds are given.
Source arXiv, quant-ph/9703022
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