量子变点的在线最优精确识别
Online optimal exact identification of a quantum change point
摘要：
我们考虑在线检测策略，用于识别据称在相同状态下制备的量子粒子流中的变点。我们表明，识别的变化点可以通过连续的本地测量，同时达到最佳性能的量子力学设置的范围内没有错误。通过这种方式，我们建立了准确识别量子变化点的任务，作为局部协议与全局协议一样强大的实例。最佳的在线检测策略在后续测量之间只需要一位存储器，并且它适合于用当前技术进行实验实现。
英文摘要：
We consider online detection strategies for identifying a change point in a stream of quantum particles allegedly prepared in identical states. We show that the identification of the change point can be done without error via sequential local measurements while attaining the optimal performance bound set by quantum mechanics. In this way, we establish the task of exactly identifying a quantum change point as an instance where local protocols are as powerful as global ones. The optimal online detection strategy requires only one bit of memory between subsequent measurements, and it is amenable to experimental realization with current technology.
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