论文标题
部分连贯的直接总和通道
Partially Coherent Direct Sum Channels
论文作者
论文摘要
我们引入了部分连贯的直接总和（PCD）量子通道，作为已经知道的直接总和量子通道的概括。我们得出了必要和足够的条件，以识别可降解的图的子集，并为其量子能力提供简化的表达。有趣的是，PCD的特殊结构使我们能够扩展量子容量公式的计算，也可以针对明确无法降解（也不可抗抗原）的量子通道进行计算。我们展示了结果在驱动通道，幅度阻尼通道和两者组合中的应用实例。
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.
