Transformations leaving the maximal eigenvalue of quantum states invariant. (Chinese. English summary) Zbl 07822550
Summary: Quantum states are positive operators with unit traces on a Hilbert space. The set of all quantum states is convex. In the paper, we give a characterization of maps leave the maximal eigenvalue of convex combinations of quantum states.
MSC:
| 47B49 | Transformers, preservers (linear operators on spaces of linear operators) |
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