Quantum Information is Physical

Details Quantum Information is Physical Quantum Information is Physical

1997-10-23

arxiv.org/abs/cond-mat/9710259v2

Superlattices and Microstructures 23, 419 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

28 pages, Latex, 2 eps figures, Paper to be published in Superlattices and Microstructures, Special Issue on the Occasion of R

Scientific paper

10.1006/spmi.1997.0520

We discuss a few current developments in the use of quantum mechanically coherent systems for information processing. In each of these developments, Rolf Landauer has played a crucial role in nudging us and other workers in the field into asking the right questions, some of which we have been lucky enough to answer. A general overview of the key ideas of quantum error correction is given. We discuss how quantum entanglement is the key to protecting quantum states from decoherence in a manner which, in a theoretical sense, is as effective as the protection of digital data from bit noise. We also discuss five general criteria which must be satisfied to implement a quantum computer in the laboratory, and we illustrate the application of these criteria by discussing our ideas for creating a quantum computer out of the spin states of coupled quantum dots.

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