Collectively induced transparency and absorption in waveguide quantum electrodynamics with Bragg atom arrays  

作　　者：Haolei Cheng Wei Nie 

机构地区：[1]Center for Joint Quantum Studies and Department of Physics,School of Science,Tianjin University,Tianjin 300350,China [2]Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology,Tianjin University,Tianjin 300350,China

出　　处：《Communications in Theoretical Physics》2024年第8期19-28,共10页理论物理通讯（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 12105025)。

摘　　要：Collective quantum states, such as subradiant and superradiant states, are useful for controlling optical responses in many-body quantum systems. In this work, we study novel collective quantum phenomena in waveguide-coupled Bragg atom arrays with inhomogeneous frequencies.For atoms without free-space dissipation, collectively induced transparency is produced by destructive quantum interference between subradiant and superradiant states. In a large Bragg atom array, multi-frequency photon transparency can be obtained by considering atoms with different frequencies. Interestingly, we find collectively induced absorption(CIA) by studying the influence of free-space dissipation on photon transport. Tunable atomic frequencies nontrivially modify decay rates of subradiant states. When the decay rate of a subradiant state equals to the free-space dissipation, photon absorption can reach a limit at a certain frequency. In other words, photon absorption is enhanced with low free-space dissipation, distinct from previous photon detection schemes. We also show multi-frequency CIA by properly adjusting atomic frequencies. Our work presents a way to manipulate collective quantum states and exotic optical properties in waveguide quantum electrodynamics(QED) systems.

关 键 词：waveguide quantum electrodynamics collective quantum states photon absorption Bragg atom array 

分 类 号：O413.2[理学—理论物理]