Average output entropy for quantum channels

Details Average output entropy for quantum channels Average output entropy for quantum channels

2011-05-11

arxiv.org/abs/1105.2282v2

J. Math. Phys. vol. 52, 112202 (2011)

Physics

Quantum Physics

32 pages, several plots and figures; positivity condition added for Theorem on entanglement breaking channels; new result for

Scientific paper

We study the regularized average Renyi output entropy $\bar{S}_{r}^{\reg}$ of quantum channels. This quantity gives information about the average noisiness of the channel output arising from a typical, highly entangled input state in the limit of infinite dimensions. We find a closed expression for $\beta_{r}^{\reg}$, a quantity which we conjecture to be equal to $\Srreg$. We find an explicit form for $\beta_{r}^{\reg}$ for some entanglement-breaking channels, and also for the qubit depolarizing channel $\Delta_{\lambda}$ as a function of the parameter $\lambda$. We prove equality of the two quantities in some cases, in particular we conclude that for $\Delta_{\lambda}$ both are non-analytic functions of the variable $\lambda$.

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