## Annals of Functional Analysis

### Shannon type inequalities of a relative operator entropy including Tsallis and Rényi ones

#### Abstract

Let $\mathbb{A}=(A_1,\cdots,A_n)$ and $\mathbb{B}=(B_1,\cdots,B_n)$ be operator distributions, that is, $A_i, B_i>0$ $(1\leq i \leq n)$ and $\sum_{i=1}^n A_i =\sum_{i=1}^n B_i =I$. We give a new relative operator entropy of two operator distributions as follows: For $t,s \in \mathbb{R} \setminus \{0\}$, $K_{t,s}(\mathbb{A}|\mathbb{B}) \equiv \dfrac{(\sum_{i=1}^n A_i \sharp_{t} B_i)^s -I}{ts},$ where $A \sharp_{t} B = A^{\frac12} (A^{\frac{-1}2} B A^{\frac{-1}2})^{t} A^{\frac12}.$ This includes relative operator entropy $S(\mathbb{A}|\mathbb{B})$, Rényi relative operator entropy $I_{t}(\mathbb{A}|\mathbb{B})$ and Tsallis relative operator entropy $T_{t}(\mathbb{A}|\mathbb{B})$. In this paper, firstly, we discuss fundamental properties of $K_{t,s}(\mathbb{A}|\mathbb{B})$. Secondly, we obtain Shannon type operator inequalities by using $K_{t,s}(\mathbb{A}|\mathbb{B})$, which include previous results by Furuta, Yanagi--Kuriyama--Furuichi and ourselves.

#### Article information

Source
Ann. Funct. Anal., Volume 6, Number 4 (2015), 289-300.

Dates
First available in Project Euclid: 1 July 2015

https://projecteuclid.org/euclid.afa/1435764017

Digital Object Identifier
doi:10.15352/afa/06-4-289

Mathematical Reviews number (MathSciNet)
MR3365997

Zentralblatt MATH identifier
1333.47015

#### Citation

Isa, Hiroshi; Ito, Masatoshi; Kamei, Eizaburo; Tohyama, Hiroaki; Watanabe, Masayuki. Shannon type inequalities of a relative operator entropy including Tsallis and Rényi ones. Ann. Funct. Anal. 6 (2015), no. 4, 289--300. doi:10.15352/afa/06-4-289. https://projecteuclid.org/euclid.afa/1435764017

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