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26 April 2024
 
  » arxiv » quant-ph/9912122

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Optimal signal ensembles
Benjamin Schumacher ; Michael D. Westmoreland ;
Date 31 Dec 1999
Subject quant-ph
AffiliationKenyon College) and Michael D. Westmoreland (Denison University
AbstractClassical messages can be sent via a noisy quantum channel in various ways, corresponding to various choices 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.
Source arXiv, quant-ph/9912122
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