Telescopic Relative Entropy--II Triangle inequalities

Details Telescopic Relative Entropy--II Triangle inequalities Telescopic Relative Entropy--II Triangle inequalities

2011-02-15

arxiv.org/abs/1102.3041v2

Physics

Mathematical Physics

14 pages; V2: minor typographic changes

Scientific paper

In previous work (see arxiv:1102.3040), we have defined the telescopic relative entropy (TRE), which is a regularisation of the quantum relative entropy $S(\rho||\sigma)=\trace\rho(\log\rho-\log\sigma)$, by replacing the second argument $\sigma$ by a convex combination of the first and the second argument, $\tau=a\rho+(1-a)\sigma$ and dividing the result by $-\log a$. We also explored some basic properties of the TRE. In this follow-up paper we state and prove two upper bounds on the variation of the TRE when either the first or the second argument changes. These bounds are close in spirit to a triangle inequality. For the ordinary relative entropy no such bounds are possible due to the fact that the variation could be infinite.

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