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arXiv 2407.12403quant-phcs.ITmath.IT
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经典-量子信道的可靠性函数

Reliability Function of Classical-Quantum Channels

Ke Li, Dong Yang

AI总结:

本文研究经典-量子信道可靠性函数,利用 Renes 的信道编码与隐私放大关联及新的信道 Rényi 信息刻画,证明匹配 Dalai 上界的高速率下界并解决 Holevo 猜想。

摘要:

我们研究一般经典-量子信道的可靠性函数,它描述当通信速率低于容量时译码误差衰减的最优指数。作为主要结果,我们以 Petz 形式的量子 Rényi 信息表述,证明了可靠性函数的一个下界。这解决了 Holevo 于 2000 年提出的猜想,该猜想是量子信息论中长期存在的开放问题。结果表明,当通信速率高于某个临界值时,所得下界与 Dalai 于 2013 年导出的上界相匹配。因此,我们确定了这一高速率情形下的可靠性函数。我们的方法依赖于 Renes 在 2022 年取得的突破性进展,该进展将经典-量子信道编码与隐私放大联系起来,同时也依赖于我们对信道 Rényi 信息的新刻画。

英文摘要:

We study the reliability function of general classical-quantum channels, which describes the optimal exponent of the decay of decoding error when the communication rate is below the capacity. As the main result, we prove a lower bound, in terms of the quantum Renyi information in Petz's form, for the reliability function. This resolves Holevo's conjecture proposed in 2000, a long-standing open problem in quantum information theory. It turns out that the obtained lower bound matches the upper bound derived by Dalai in 2013, when the communication rate is above a critical value. Thus, we have determined the reliability function in this high-rate case. Our approach relies on Renes' breakthrough made in 2022, which relates classical-quantum channel coding to that of privacy amplification, as well as our new characterization of the channel Renyi information.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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