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math-ph2024
A generalization of the Choi isomorphism with application to open quantum systems
Heinz-Jürgen Schmidt
Completely positive transformations play an important role in the description of state changes in quantum mechanics, including the time evolution of open quantum systems. One usefu…
math-ph2024
Species of structure and physical dimensions
Heinz-Jürgen Schmidt
This study addresses the often underestimated importance of physical dimensions and units in the formal reconstruction of physical theories, focusing on structuralist approaches th…
math-ph2012★ 4 cited
The general spin triangle
Heinz-Jürgen Schmidt
We consider the Heisenberg spin triangle with general coupling coefficients and general spin quantum number . The corresponding classical system is completely integrable. In the…