标题： 使用原子腔系统的光子到达量子非破坏性测量 显示英文标题

标题： Quantum non-demolition measurement of photon-arrival using an atom-cavity system

摘要： 一种简单且高效的量子非破坏性测量（QND）方案被提出，在该方案中，信号光子的到达被检测而不影响量子比特状态。 所提出的QND方案即使将辅助光子替换为由真空和单光子态组成的弱光时也能正常工作。 尽管该检测方案是为纠缠共享应用而设计的，但它也适用于单光子态的一般纯化。 显示英文摘要

摘要： A simple and efficient quantum non-demolition measurement (QND) scheme is proposed in which the arrival of a signal photon is detected without affecting the qubit state. The proposed QND scheme functions even if the ancillary photon is replaced with weak light composed of vacuum and one-photon states. Although the detection scheme is designed for entanglement sharing applications, it is also suitable for general purification of a single photon state.