论文标题
同时测量和纠缠
Simultaneous Measurement and Entanglement
论文作者
论文摘要
我们研究了两个空间分离的观察者爱丽丝和鲍勃（Alice）和鲍勃（Bob）试图识别从几种可能性采样的量子状态时出现的。特别是，我们研究了他们的策略，以最大程度地提高正确猜测其状态的可能性以及其信息获得的策略。众所周知，在某些情况下，允许爱丽丝和鲍勃使用LOCC可以对必须同时进行测量的情况进行改进。同样，如果爱丽丝和鲍勃有时可以使用铃铛，有时可以改善他们的结果。我们展示了LOCC如何允许爱丽丝和鲍勃最佳区分两个产品状态，并发现LOCC几乎总是比贝尔对区分产品状态更有帮助。
We study scenarios which arise when two spatially-separated observers, Alice and Bob, are try to identify a quantum state sampled from several possibilities. In particular, we examine their strategies for maximizing both the probability of guessing their state correctly as well as their information gain about it. It is known that there are scenarios where allowing Alice and Bob to use LOCC offers an improvement over the case where they must make their measurements simultaneously. Similarly, Alice and Bob can sometimes improve their outcomes if they have access to a Bell pair. We show how LOCC allows Alice and Bob to distinguish between two product states optimally and find that a LOCC is almost always more helpful than a Bell pair for distinguishing product states.
