Physics of computation: tightness of timing vs. heat generated

John M. Myers; F. Hadi Madjid

doi:10.1117/12.434209

26 July 2001 Physics of computation: tightness of timing vs. heat generated

John M. Myers, F. Hadi Madjid

Author Affiliations +

Proceedings Volume 4386, Photonic and Quantum Technologies for Aerospace Applications III; (2001) https://doi.org/10.1117/12.434209
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

We relate quantum mechanics to the concept of an experimental trial, borrowed from statistics, in order to make clear that devices designed using quantum-mechanical equations require, in effect, management by a classical digital process-control computer (CPC). Energy dissipation essential for tolerance to component imperfections in classical digital computers is shown not to mix with quantum superposition expressed by the quantum dynamics of a Schrodinger equation. This precludes so-called quantum computers from producing super-linear speed-up at a scale large enough to be useful, and at the same clarifies a conceptual separation between digital computing and devices exhibiting quantum phase sensitivity. Quantum effects, such as random-number generation and photon correlations, are know to be useful and show further great potential for devices for computational and other purpose. Several such quantum-based devices are discussed that require or can be made more effective by bridging between these devices and CPCs that manage them. While the interdisciplinary promise of 'quantum computing' has faded, the area of quantum-to- classical bridging, once liberated from the misleading goal of super-linear speed-up, invites vigorous study and invention.

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John M. Myers and F. Hadi Madjid "Physics of computation: tightness of timing vs. heat generated", Proc. SPIE 4386, Photonic and Quantum Technologies for Aerospace Applications III, (26 July 2001); https://doi.org/10.1117/12.434209

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