Physics – Quantum Physics
Scientific paper
2005-10-24
Quantum Information and Computation, Vol. 6, 583-596 (2006);
Physics
Quantum Physics
Scientific paper
Quantum relative entropy $D(\rho\|\sigma)\defeq\Tr \rho (\log \rho- \log
\sigma)$ plays an important role in quantum information and related fields.
However, there are many quantum analogues of relative entropy. In this paper,
we characterize these analogues from information geometrical viewpoint. We also
consider the naturalness of quantum relative entropy among these analogues.
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