Author

Kun Fang

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Preprint Sep 2026

Approximate majorization and high-order capacity of quantum depolarizing channels

A central challenge in quantum information theory is to determine whether entanglement provides an advantage for information processing when coherent operations across multiple channel uses are allowed. For depolarizing channels, King's proof of the additivity of the minimum output entropy rules out such an advantage f...

Zhi-Wei Song, Xin Wang, M. Tomamichel et al. · 0 citations

Preprint Sep 2026

Entanglement cost of quantum depolarization

Entanglement cost is the asymptotic rate of Bell pairs required to prepare a quantum state. Its regularized definition has made exact evaluation difficult, even for isotropic states (i.e., depolarized maximally entangled states). In this work, we determine the entanglement cost of every qubit isotropic state and, more...

Kun Fang · 0 citations