Author

Debbie W. Leung

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Preprint Oct 2026

From Permutation Symmetry to Communication Bounds and Additivity

Correlations across channel uses can improve quantum communication rates, making optimization over arbitrarily large blocks a central difficulty in determining quantum capacity. We show how full permutation invariance limits this advantage for every finite-dimensional memoryless channel. The optimized coherent informat...

Z. Khanian, Debbie W. Leung, Graeme Smith · 0 citations

Preprint Oct 2026

Nonadditivity in fermionic quantum Shannon theory

We study collective state preparation and channel encoding in fermionic systems under parity superselection and composition governed by the canonical anticommutation relations. For a two-mode Gaussian state $\tau$, we obtain the exact entanglement of formation, $E_{\mathrm F}^{\mathrm{phys}}(\tau^{\otimes m})=\lceil m/...

Farzin Salek, Amir-Reza Negari, Graeme Smith et al. · 0 citations