论文标题
多部分通道组合
Multipartite channel assemblages
论文作者
论文摘要
在最近关于量词后转向的研究的激励中，我们通过引入多部分无信号通道组合的概念来概括两分信道转向的概念。我们首先表明，除了双方情况之外，通道组合的无信号和量子描述不一致。使用choi-jamiołkowski同构，我们提供了这些组合类别的完整表征，并使用此表征为所有无信号通道组合集合中的量子通道组合的极端提供足够的条件。最后，我们介绍并讨论了频道转向的轻松版本，其中只有某些子系统遵守无信号的约束。在后一种不对称的情况下，我们显示了证明一个完美的钥匙钻头的可能性，该钥匙可与一般的无标志性窃听器相抵触。
Motivated by the recent studies on post-quantum steering, we generalize the notion of bipartite channel steering by introducing the concept of multipartite no-signaling channel assemblages. We first show that beyond the bipartite case, the no-signaling and quantum descriptions of channel assemblages do not coincide. Using the Choi-Jamiołkowski isomorphism, we present a complete characterization of these classes of assemblages and use this characterization to provide sufficient conditions for extremality of quantum channel assemblages within the set of all no-signaling channel assemblages. Finally, we introduce and discuss a relaxed version of channel steering where only certain subsystems obey the no-signaling constraints. In this latter asymmetric scenario we show the possibility of certifying a perfect key bit that is secure against a general no-signaling eavesdropper.
