论文标题
量子通道可实现的最佳见证人的最佳证人的明确构造
Explicit construction of optimal witnesses for input-output correlations attainable by quantum channels
论文作者
论文摘要
给定量子通道（即，是一个完全积极的痕量保留线性图）作为两方之间唯一可用的通信资源，我们考虑表征可以通过合适的经典噪声通道来通过合适的经典 - 量词编码和接收者的侧面来从中获得的一组经典噪声通道。我们考虑各种类别的线性证人，并为几类量子通道以封闭形式计算其最佳值。我们在这里考虑的目击者被称为交流游戏，爱丽丝的目的是利用给定量子渠道单一使用，以帮助鲍勃猜测她从外部裁判那里收到的一些信息。
Given a quantum channel -- that is, a completely positive trace-preserving linear map -- as the only communication resource available between two parties, we consider the problem of characterizing the set of classical noisy channels that can be obtained from it by means of suitable classical-quantum encodings and quantum-classical decodings, respectively, on the sender's and the receiver's side. We consider various classes of linear witnesses and compute their optimum values in closed form for several classes of quantum channels. The witnesses that we consider here are formulated as communication games, in which Alice's aim is to exploit a single use of a given quantum channel to help Bob guess some information she has received from an external referee.
