Title

Optimal signal ensembles

Document Type

Article

Publication Date

January 2001

Abstract

Classical messages can be sent via a noisy quantum channel in various ways, corresponding to various choices of ensembles of signal states of the channel. Previous work by Holevo and by Schumacher and Westmoreland relates the capacity of the channel to the properties of the signal ensemble. Here we describe some properties characterizing the ensemble that maximizes the capacity, using the relative entropy “distance” between density operators to give the results a geometric flavor.

Journal

Physical Review A

Volume

63

Issue

2

First Page

22308

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