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arXiv 2008.00494quant-ph
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部分相干直和信道

Partially Coherent Direct Sum Channels

Stefano Chessa, Vittorio Giovannetti

摘要:

我们引入部分相干直接和(PCDS)量子信道,作为已知的直接和量子信道的推广.我们得到了确定这些映射的子集是可降解的必要和充分条件,并提供了一个简化的表达式,其量子容量。有趣的是,PCDS的特殊结构允许我们扩展量子容量公式的计算,也适用于明确不可降解(也不可抗降解)的量子信道。我们展示的实例的结果,移相通道,振幅阻尼通道和两者的组合的应用程序。

英文摘要:

We introduce Partially Coherent Direct Sum (PCDS) quantum channels, as a generalization of the already known Direct Sum quantum channels. We derive necessary and sufficient conditions to identify the subset of those maps which are degradable, and provide a simplified expression for their quantum capacities. Interestingly, the special structure of PCDS allows us to extend the computation of the quantum capacity formula also for quantum channels which are explicitly not degradable (nor antidegradable). We show instances of applications of the results to dephasing channels, amplitude damping channels and combinations of the two.

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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