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Università degli Studi di Genova |
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Università degli Studi di Genova |
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Abstract: We extend the Blanchard and Olkiewicz's de nition of decoherence to open quantum systems whose dynamics are described by semigroups of positive (and not necessarily complete positive) operators on B(h). In particular, in the case h = C2, we complete characterize the decomposition B(h) =M1+M2 of B(h) in the sum of a decoherence-free part M1 and of a space M2 on which the semigroup vanishes with time. Keywords: quantum semigroups, decoherence MSC: 81, 47  |