Devetak Igor, Harrow Aram W, Winter Andreas
IBM T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598, USA.
Phys Rev Lett. 2004 Dec 3;93(23):230504. doi: 10.1103/PhysRevLett.93.230504.
We introduce three new quantum protocols involving noisy quantum channels and entangled states, and relate them operationally and conceptually with four well-known old protocols. Two of the new protocols (the mother and father) can generate the other five "child" protocols by direct application of teleportation and superdense coding, and can be derived in turn by making the old protocols "coherent." This gives very simple proofs for two famous old protocols (the hashing inequality and quantum channel capacity) and provides the basis for optimal trade-off curves in several quantum information processing tasks.
我们介绍了三种涉及噪声量子信道和纠缠态的新量子协议，并在操作和概念上将它们与四个著名的旧协议联系起来。其中两个新协议（母协议和父协议）可以通过直接应用隐形传态和超密集编码来生成其他五个“子”协议，反过来，也可以通过使旧协议“相干”来推导得出。这为两个著名的旧协议（哈希不等式和量子信道容量）提供了非常简单的证明，并为几个量子信息处理任务中的最优权衡曲线提供了基础。
