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arXiv 0901.3038quant-ph
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量子香农理论中的经典通信、量子通信和纠缠

Trading classical communication, quantum communication, and entanglement in quantum Shannon theory

Min-Hsiu Hsieh, Mark M. Wilde

摘要:

我们给出了经典通信,量子通信和纠缠处理信息的香农理论设置之间的权衡。我们首先证明了一个单位资源容量定理,适用于只有上述三个无噪声资源可供消费或发电的情况。最优策略混合了隐形传态、超密集编码和纠缠分发这三种基本协议。然后,我们提供了一个可实现的速率区域和匹配的多字母逆的直接静态容量定理。该定理适用于有大量有噪二分态副本可用的情况(除了消耗或生成上述三种无噪资源之外)。我们的编码策略涉及一个协议,我们命名为经典辅助状态重分配协议和三个基本协议。最后,我们提供了一个可实现的速率区域和匹配的多字母逆的直接动态容量定理。该定理适用于除了消耗或生成三个无噪声资源之外,还可以大量使用有噪声的量子信道的情况。我们的编码策略结合了经典的增强父亲协议与三个基本单元协议。

英文摘要:

We give trade-offs between classical communication, quantum communication, and entanglement for processing information in the Shannon-theoretic setting. We first prove a unit-resource capacity theorem that applies to the scenario where only the above three noiseless resources are available for consumption or generation. The optimal strategy mixes the three fundamental protocols of teleportation, super-dense coding, and entanglement distribution. We then provide an achievable rate region and a matching multi-letter converse for the direct static capacity theorem. This theorem applies to the scenario where a large number of copies of a noisy bipartite state are available (in addition to consumption or generation of the above three noiseless resources). Our coding strategy involves a protocol that we name the classically-assisted state redistribution protocol and the three fundamental protocols. We finally provide an achievable rate region and a matching mutli-letter converse for the direct dynamic capacity theorem. This theorem applies to the scenario where a large number of uses of a noisy quantum channel are available in addition to the consumption or generation of the three noiseless resources. Our coding strategy combines the classically-enhanced father protocol with the three fundamental unit protocols.

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