paper

Average Entropy of a Subsystem

arXiv:gr-qc/9305007 · doi:10.1103/PhysRevLett.71.1291

Abstract

If a quantum system of Hilbert space dimension is in a random pure state, the average entropy of a subsystem of dimension is conjectured to be and is shown to be for . Thus there is less than one-half unit of information, on average, in the smaller subsystem of a total system in a random pure state.

10 pages, LaTeX. Title change and minor corrections added before publication in Phys. Rev. Lett. 71 (1993) 1291. Alberta-Thy-22-93

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