论文标题
通过有条件测量在自由空间中自发排放的工程
Engineering of spontaneous emission in free space via conditional measurements
论文作者
论文摘要
我们通过测量Glauber的三阶光子相关函数来研究最初在激发态中制备的三个相同两级原子的集体自发发射。假设两个原子彼此之间处于次波长距离处，以便它们受到偶极 - 偶极相互作用，而第三个则位于几个波长之外，我们观察到超级和亚基衰变，具体取决于观察方向。与没有引入远程原子或未进行条件测量的情况不同，条件三原子系统的自发发射行为与单原子和规范的两种原子配置有很大不同。与三个光子相关函数相关的条件测量与相邻原子之间的偶极 - 偶极相互作用相关联导致不同衰减通道之间的量子干扰，从而可以在时空和时间上自发发射。
We study the collective spontaneous emission of three identical two-level atoms initially prepared in the excited states by measuring Glauber's third-order photon correlation function. Assuming two atoms at sub-wavelength distance from each other such that they are subject to the dipole-dipole interaction while the third one is located several wavelengths away, we observe super- and subradiant decay alike, depending on the direction of observation. Unlike the case where no remote atom is introduced or no conditional measurements are performed, the spontaneous emission behavior of the conditioned three-atom system differs strongly from the single-atom and the canonical two-atom configuration. The conditional measurements associated with the three-photon correlation function in combination with the dipole-dipole interaction between the adjacent atoms lead to quantum interference among the different decay channels allowing to engineer the spontaneous emission in space and time.
