Dynamics of initially entangled open quantum systems

Details Dynamics of initially entangled open quantum systems Dynamics of initially entangled open quantum systems

2004-07-12

arxiv.org/abs/quant-ph/0407083v1

Phys.Rev. A70 (2004) 052110

Physics

Quantum Physics

4 figures

Scientific paper

10.1103/PhysRevA.70.052110

Linear maps of matrices describing evolution of density matrices for a quantum system initially entangled with another are identified and found to be not always completely positive. They can even map a positive matrix to a matrix that is not positive, unless we restrict the domain on which the map acts. Nevertheless, their form is similar to that of completely positive maps. Only some minus signs are inserted in the operator-sum representation. Each map is the difference of two completely positive maps. The maps are first obtained as maps of mean values and then as maps of basis matrices. These forms also prove to be useful. An example for two entangled qubits is worked out in detail. Relation to earlier work is discussed.

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