Additivity of the Renyi entropy of order 2 for positive-partial-transpose-inducing channels

Details Additivity of the Renyi entropy of order 2 for positive-partial-transpose-inducing channels Additivity of the Renyi entropy of order 2 for positive-partial-transpose-inducing channels

2008-03-04

arxiv.org/abs/0803.0479v2

Physics

Quantum Physics

4 pages

Scientific paper

10.1103/PhysRevA.77.060302

We prove that the minimal Renyi entropy of order 2 (RE2) output of a positive-partial-transpose(PPT)-inducing channel joint to an arbitrary other channel is equal to the sum of the minimal RE2 output of the individual channels. PPT-inducing channels are channels with a Choi matrix which is bound entangled or separable. The techniques used can be easily recycled to prove additivity for some non-PPT-inducing channels such as the depolarizing and transpose depolarizing channels, though not all known additive channels. We explicitly make the calculations for generalized Werner-Holevo channels as an example of both the scope and limitations of our techniques.

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