Author

Bjarne Bergh

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Preprint Sep 2026

Robust classical and quantum communication over almost-iid channels

The independent and identically distributed (iid) paradigm for asymptotic communication through quantum channels describes $n$ uses of a channel $\Phi$ by $\Phi^{\otimes n}$. Since exact tensor-power behaviour is an idealization, we ask whether the asymptotic capacities of $\Phi$ remain achievable for channel sequences...

Liu Ye, Bjarne Bergh, Nilanjana Datta · 0 citations

Preprint Sep 2026

Quantum de Finetti theorems for states and channels in any distance measure

Standard finite quantum de Finetti theorems approximate the $k$-system marginals of permutation-invariant states of $n$-systems by mixtures of independent and identically distributed (iid) states, usually in trace distance. We prove both standard and Renner's exponential de Finetti theorems in the stronger form of oper...

Liu Ye, Bjarne Bergh, Nilanjana Datta · 1 citation