论文标题
对渠道歧视的平行，顺序和无限 - 可生主阶策略之间的严格层次结构
Strict hierarchy between parallel, sequential, and indefinite-causal-order strategies for channel discrimination
论文作者
论文摘要
我们提出了两个Qubit-Qubit量子通道的最小错误歧视任务的实例，顺序策略的表现优于任何并行策略。然后，我们建立了两种新的渠道歧视策略，涉及不确定的因果秩序，并表明在所有四种策略的绩效之间存在严格的层次结构。我们的证明技术采用了计算机辅助证明的一般方法。我们还提供了一种系统的方法来查找展示这种现象的渠道对，表明策略之间的层次结构并不是我们的主要示例。
We present an instance of a task of minimum-error discrimination of two qubit-qubit quantum channels for which a sequential strategy outperforms any parallel strategy. We then establish two new classes of strategies for channel discrimination that involve indefinite causal order and show that there exists a strict hierarchy among the performance of all four strategies. Our proof technique employs a general method of computer-assisted proofs. We also provide a systematic method for finding pairs of channels that showcase this phenomenon, demonstrating that the hierarchy between the strategies is not exclusive to our main example.
