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arXiv:1701.02523 · Letters in Mathematical Physics

Maps on positive definite operators preserving the quantum $$\chi _\alpha ^2$$ χ α 2 -divergence

Hongyi Chen, György Pál Gehér, Chih-Neng Liu, Lajos Molnár, Dániel Virosztek, Ngai‐Ching Wong

Published Sep 8, 2017• 5 citations
arXivHTMLPDF
DOI
10.1007/s11005-017-0989-0

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Maps on positive definite operators preserving the quantum χα2\chi _\alpha ^2χα2​ χ α 2 -divergence
Maps on density operators preserving quantum fff -divergences
There are many proposals for defining a quantum version of the Rényi divergence on the differentiable manifold P of positive definite matrices. The geodesic connecting two points on P is a weighted matrix geometric mean, and its tangent vector is the relative operator entropy. It is a natural idea to use the relative operator entropy to describe the difference between two points on P. The quantum version of the classical results of Rényi divergence does not always hold due to its non-commutativity. Due to this difficulty, we use the upper bound and the lower one of the spectrum of positive definite matrices to estimate the order relation between quantum divergences, which is called the Mond Pečarić method in operator theory. In this paper, we show fundamental properties of the ♮α-Rényi divergence of real order α∈R, including monotonicity of order, the relation of max- and min-divergence, data processing inequality, bound estimates, and convexity. We also estimate the difference without the α–z-Rényi divergence and ♮α-Rényi divergence in terms of the generalized Kantorovich constant and the Specht ratio.