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Quantum Channels, Wavelets, Dilations and Representations of $O_n$

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arxiv math/0309390 v1 pith:36LBWNAB submitted 2003-09-23 math.OA quant-ph

classification math.OAquant-ph
keywords analysisquantumrepresentationstheoryalgebrasapplicationarisechannel
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abstract

We show that the representations of the Cuntz C$^\ast$-algebras $O_n$ which arise in wavelet analysis and dilation theory can be classified through a simple analysis of completely positive maps on finite-dimensional space. Based on this analysis, an application in quantum information theory is obtained; namely, a structure theorem for the fixed point set of a unital quantum channel. We also include some open problems motivated by this work.

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  1. Information storage and transmission under Markovian noise

    quant-ph 2025-04 unverdicted novelty 5.0 of 10

    Quantum Markov semigroups on d-dimensional systems have infinite-time capacities determined by peripheral space structure, with convergence after time t ≳ d² ln(d), and explicit bounds showing n-qubit memories fail af...

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