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arXiv 2607.24687quant-phmath-phmath.MP

量子条件熵的尖锐连续性

Sharp continuity of quantum conditional entropy

Mario Berta, Pablo Costa Rico, Gereon Kossmann, Ludovico Lami, Julius A. Zeiss

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中文总结 AI 辅助

研究量子条件熵的尖锐连续性界,借助ChatGPT 5.6 Sol,基于并改编经典证明方法,得出两个二分态在特定迹距离和维度条件下,量子条件熵的最优连续性模,且当dim B ≥ d时该界在[0,1]上紧。

中文摘要 AI 辅助

我们证明了量子条件熵的尖锐一致连续性界。若两个二分态的迹距离至多为δ且d = dim A,最优的仅依赖维度的连续性模在δ = 1 - d⁻²之前是h₂(δ)+δlog(d² - 1),之后是2log d,其中h₂表示二元熵。当dim B ≥ d时,该界对每个δ ∈ [0,1]都是紧的。关键证明思路借助ChatGPT 5.6 Sol,基于并改编了Alhejji & Smith [IEEE ISIT (2020)]的紧经典证明,其采用了概念上不同的方法。

英文摘要

We prove the sharp uniform continuity bound for quantum conditional entropy. If two bipartite states are at trace distance at most $δ$ and $d=\dim A$, the optimal dimension-only modulus of continuity is $h_2(δ)+δ\log(d^2-1)$ up to $δ=1-d^{-2}$ and $2\log d$ thereafter, where $h_2$ denotes the binary entropy. When $\dim B\ge d$, this bound is tight for every $δ\in[0,1]$. The key proof idea was developed with the assistance of ChatGPT 5.6 Sol, building on and adapting the tight classical proof of Alhejji \& Smith [IEEE ISIT (2020)], which follows a conceptually different approach.

发表机构

  • Institute for Quantum Information, RWTH Aachen University(亚琛工业大学量子信息研究所)
  • Scuola Normale Superiore(比萨高等师范学院)

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