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Quantum Processes Systems, and Information by Michael Westmoreland, Benjamin Schumacher

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D  Appendix D  Generalized evolution

D.1 Completely positive maps

image

In Chapter 9 we described the dynamics of a system Q that interacted with an external “environment” system E, which was initially in a standard state |0image. This open system evolution was described by the map image, so that the initial density operator ρ evolved by

image

(D.1)

for a unitary ...

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