标题： 通过光子探测选择的纠缠态 显示英文标题

标题： Postselected Entangled States by Photon Detection

摘要： 后选择是一种非确定性机制，用于纠缠子系统，常用于弱激发系统。 我们这里展示了如何通过光子检测来纠缠两个能级发射器的高激发集合。 形成一个集体自旋，其特征是由远场测量检测到的压缩参数。 虽然退相干对这种条件纠缠有害，但连续的光子检测起到了纯化过程的作用，并恢复了自旋压缩。 我们的工作为开放量子系统中后选择纠缠的生成开辟了新的途径。 显示英文摘要

摘要： Postselection is a non-deterministic mechanism to entangle subsystems, often used in weakly-excited systems. We here show how highly-excited ensembles of two-level emitters can be entangled by photon detection. A collective spin is formed, characterized by a squeezing parameter detected by far-field measurements. While decoherence is detrimental to this conditional entanglement, successive photon detections act as a purification process and restores the spin squeezing. Our work opens up new avenues for the generation of postselected entanglement in open quantum systems.