Dynamical maps and density matrices

The relations between dynamical maps and quantum states of bipartite systems are analyzed from the perspective of quantum conditional probability. In particular, we explore new interesting relations between completely positive maps, which correspond to quantum channels, and states of bipartite syste...

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Veröffentlicht in:Journal of physics. Conference series 2009-11, Vol.196 (1), p.012023
Hauptverfasser: Asorey, M, Kossakowski, A, Marmo, G, Sudarshan, E C G
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Sprache:eng
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Zusammenfassung:The relations between dynamical maps and quantum states of bipartite systems are analyzed from the perspective of quantum conditional probability. In particular, we explore new interesting relations between completely positive maps, which correspond to quantum channels, and states of bipartite systems which correspond to correlations between the initial and final states. The new connection emerges in a natural way from the generalisation of the classical concept of conditional probability. We develop applications of these relations which prove to be very useful in both directions, either for the classification of positive maps which are not completely positive, the classification of non-decomposable dynamical maps or for the classification of positive partial transpose and entangled states.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/196/1/012023