Abstract
We consider both known and not previously studied trace functions with applications in quantum physics. By using perspectives we obtain convexity statements for different notions of residual entropy, including the entropy gain of a quantum channel studied by Holevo and others. We give new proofs of Carlen-Lieb's concavity/convexity theorems for certain trace functions, by making use of the theory of operator monotone functions. We then apply these methods in a study of new classes of trace functions.
| Original language | English |
|---|---|
| Pages (from-to) | 807-818 |
| Number of pages | 12 |
| Journal | Journal of Statistical Physics |
| Volume | 154 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2014 Feb 1 |
Keywords
- Convexity
- Entropy gain
- Operator monotone function
- Residual entropy
- Trace function
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Mathematical Physics
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Hansen, F. (2014). Trace Functions with Applications in Quantum Physics. Journal of Statistical Physics, 154(3), 807-818. https://doi.org/10.1007/s10955-013-0890-x