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arXiv 1508.04095cs.ITcs.DSmath.ITquant-ph
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最佳信道编码的数学问题

Algorithmic Aspects of Optimal Channel Coding

Siddharth Barman, Omar Fawzi

摘要:

信息论中的一个中心问题是确定在噪声信道上发送固定数量的消息所能达到的最大成功概率。这是第一次研究的开创性工作香农谁建立了一个简单的表达式表征这个数量的限制多个独立使用的渠道。这里我们考虑仅使用一次通道的一般设置。我们观察到,最大成功概率可以表示为子模函数的最大值。利用这种联系,我们建立了以下结果:1。有一个简单的贪婪多项式时间算法,它计算一个代码,实现最大成功概率的(1-1/e)近似。此外,对于这个问题,它是NP-困难的,以获得一个近似比严格优于(1-1/e)。2.发送者和接收者之间的共享量子纠缠可以将成功概率提高至多1/(1-1/e)倍。此外,如果允许发送方和接收方之间存在任意的非信令盒,则该因子是紧的。3.我们给出了Polyanskiy-Poor-Verdu的元逆的一次性能的紧界。

英文摘要:

A central question in information theory is to determine the maximum success probability that can be achieved in sending a fixed number of messages over a noisy channel. This was first studied in the pioneering work of Shannon who established a simple expression characterizing this quantity in the limit of multiple independent uses of the channel. Here we consider the general setting with only one use of the channel. We observe that the maximum success probability can be expressed as the maximum value of a submodular function. Using this connection, we establish the following results: 1. There is a simple greedy polynomial-time algorithm that computes a code achieving a (1-1/e)-approximation of the maximum success probability. Moreover, for this problem it is NP-hard to obtain an approximation ratio strictly better than (1-1/e). 2. Shared quantum entanglement between the sender and the receiver can increase the success probability by a factor of at most 1/(1-1/e). In addition, this factor is tight if one allows an arbitrary non-signaling box between the sender and the receiver. 3. We give tight bounds on the one-shot performance of the meta-converse of Polyanskiy-Poor-Verdu.

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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