Coexistence of quantum operations

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This publication doesn't include Institute of Computer Science. It includes Faculty of Informatics. Official publication website can be found on muni.cz.
Authors

ZIMAN Mário HEINOSAARI Teiko REITZNER Daniel STANO Peter

Year of publication 2009
Type Article in Periodical
Magazine / Source Journal of Physics A: Mathematical and Theoretical
MU Faculty or unit

Faculty of Informatics

Citation
Web http://arxiv.org/abs/0905.4953
Field Informatics
Keywords Quantum information processing; quantum operations
Description Quantum operations are used to describe the observed probability distributions and conditional states of the measured system. In this paper, we address the problem of their joint measurability (coexistence). We derive two equivalent coexistence criteria. The two most common classes of operations - Luders operations and conditional state preparators - are analyzed. It is shown that Luders operations are coexistent only under very restrictive conditions, when the associated effects are either proportional to each other, or disjoint.
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