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arXiv 0705.3838quant-ph
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带对称边信道的私有经典容量及其在量子密码中的应用

The private classical capacity with a symmetric side channel and its application to quantum cryptography

Graeme Smith

摘要:

研究了量子信道的边信道辅助私有容量,给出了单字母公式。这种能力是附加的,凸的,并且对于可降解的信道,等于无辅助的私有容量。虽然一个通道的(无辅助)容量为私人经典通信可能会严格大于其量子容量,我们将表明,这些能力是相等的可降解的通道,从而证明了在这种情况下的隐私和量子相干性的等价性。利用这些思想,我们找到了新的界限的量子密钥分发协议的密钥速率与单向经典后处理。对于Bennett-Bennard-84(BB84)协议,我们的研究结果表明,集体攻击严格强于个人攻击。

英文摘要:

We study the symmetric-side-channel-assisted private capacity of a quantum channel, for which we provide a single-letter formula. This capacity is additive, convex, and, for degradable channels, equal to the unassisted private capacity. While a channel's (unassisted) capacity for for private classical communication may be strictly larger than its quantum capacity, we will show that these capacities are equal for degradable channels, thus demonstrating the equivalence of privacy and quantum coherence in this context. We use these ideas to find new bounds on the key rate of quantum key distribution protocols with one-way classical post-processing. For the Bennett-Brassard-84 (BB84) protocol, our results demonstrate that collective attacks are strictly stronger than individual attacks.

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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