Extreme single-excitation subradiance from two-band Bloch oscillations in atomic arrays  

作　　者：LUOJIA WANG DA-WEI WANG LUQI YUAN YAPING YANG XIANFENG CHEN 

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [2]Interdisciplinary Center for Quantum Information and State Key Laboratory of Modern Optical Instrumentation,Zhejiang Province Key Laboratory of Quantum Technology and Device,and School of Physics,Zhejiang University,Hangzhou 310027,China [3]MOE Key Laboratory of Advanced Micro-Structured Materials,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China [4]Shanghai Research Center for Quantum Sciences,Shanghai 201315,China [5]Collaborative Innovation Center of Light Manipulations and Applications,Shandong Normal University,Jinan 250358,China

出　　处：《Photonics Research》2024年第3期571-580,共10页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(12204304);National Key Research and Development Program of China(2021YFA1400900,2023YFA1407200)。

摘　　要：Atomic arrays provide an important quantum optical platform with photon-mediated dipole–dipole interactions that can be engineered to realize key applications in quantum information processing.A major obstacle for such applications is the fast decay of the excited states.By controlling two-band Bloch oscillations of single excitation in an atomic array under an external magnetic field,here we show that exotic subradiance can be realized and maintained with orders of magnitude longer than the spontaneous decay time in atomic arrays with the finite size.The key finding is to show a way for preventing the wavepacket of excited states scattering into the dissipative zone inside the free space light cone,which therefore leads to the excitation staying at a subradiant state for an extremely long decay time.We show that such operation can be achieved by introducing a spatially linear potential from the external magnetic field in the atomic arrays and then manipulating interconnected two-band Bloch oscillations along opposite directions.Our results also point out the possibility of controllable switching between superradiant and subradiant states,which leads to potential applications in quantum storage.

关 键 词：EXCITATION BLOCH DECAY 

分 类 号：O431.2[机械工程—光学工程]