All maps equivalent to a given map, completely positive or not

Details All maps equivalent to a given map, completely positive or not All maps equivalent to a given map, completely positive or not

2010-04-06

arxiv.org/abs/1004.0951v2

PhysRevA. 82. 022325 (2010)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.82.022325

A dynamical map is a map which takes one density operator to another. Such a map can be written in an operator-sum representation (OSR) using a spectral decomposition. The method of the construction applies to more general maps which need not be completely positive. The OSR not unique; there is a freedom to choose the set of operators in the OSR differently, yet still obtain the same map. Here we identify all maps which are equivalent to a given map. Whereas the freedom for completely positive maps is unitary, the freedom for maps which are not necessarily completely positive is pseudo-unitary.

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