Aoki Takao, Parkins A S, Alton D J, Regal C A, Dayan Barak, Ostby E, Vahala K J, Kimble H J
Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA.
Phys Rev Lett. 2009 Feb 27;102(8):083601. doi: 10.1103/PhysRevLett.102.083601.
Single photons from a coherent input are efficiently redirected to a separate output by way of a fiber-coupled microtoroidal cavity interacting with individual cesium atoms. By operating in an overcoupled regime for the input-output to a tapered fiber, our system functions as a quantum router with high efficiency for photon sorting. Single photons are reflected and excess photons transmitted, as confirmed by observations of photon antibunching (bunching) for the reflected (transmitted) light. Our photon router is robust against large variations of atomic position and input power, with the observed photon antibunching persisting for intracavity photon number 0.03 < or approximately similar n < or approximately similar 0.7.
来自相干输入的单光子通过与单个铯原子相互作用的光纤耦合微环腔被有效地重定向到单独的输出端。通过在输入到锥形光纤的过耦合状态下运行，我们的系统作为一种量子路由器，在光子分选方面具有高效率。单光子被反射，多余的光子被透射，这通过对反射（透射）光的光子反聚束（聚束）观测得到证实。我们的光子路由器对原子位置和输入功率的大幅变化具有鲁棒性，观察到的光子反聚束在腔内光子数0.03＜或≈n＜或≈0.7时持续存在。
