Centre for Quantum Information and Foundations, DAMTP, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom.
Phys Rev Lett. 2013 May 24;110(21):210402. doi: 10.1103/PhysRevLett.110.210402. Epub 2013 May 22.
How much information can a transmitted physical system fundamentally communicate? We introduce the principle of quantum information causality, which states the maximum amount of quantum information that a quantum system can communicate as a function of its dimension, independently of any previously shared quantum physical resources. We present a new quantum information task, whose success probability is upper bounded by the new principle, and show that an optimal strategy to perform it combines the quantum teleportation and superdense coding protocols with a task that has classical inputs.
一个传输的物理系统能从根本上传递多少信息？我们引入了量子信息因果关系原理，该原理指出，一个量子系统能够传递的最大量子信息量是其维度的函数，与任何先前共享的量子物理资源无关。我们提出了一个新的量子信息任务，其成功概率受新原理的上限约束，并表明执行该任务的最佳策略是将量子隐形传态和超密集编码协议与具有经典输入的任务相结合。
