Quantum optical devices based on four-wave mixing in hot rubidium vapor  

作　　者：FANG YaMi QIN ZhongZhong WANG HaiLong CAO LeiMing XIN Jun FENG JingLiang ZHANG WeiPing JING JieTai 

机构地区：[1]State Key Laboratory of Precision Spectroscopy,Quantum Institute for Light and Atoms,Department of Physics,East China Normal University

出　　处：《Science China(Physics,Mechanics & Astronomy)》2015年第6期47-54,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants Nos.91436211,11374104,10974057 and 11234003);the Specialized Research Fund for the Doctoral Program(Grant No.20130076110011);the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning;the Program for New Century Excellent Talents in University(Grant No.NCET-10-0383);the Shu Guang project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation(Grant No.11SG26);the Shanghai Pujiang Program(Grant No.09PJ1404400);the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry and the National Basic Research Program of China(Grant No.2011CB921604)

摘　　要：In this paper,we briefly review the recent experimental progresses in quantum optics based on four-wave mixing(FWM) processes in hot rubidium vapor,particularly our two recent experiments in quantum information.We have experimentally produced strong quantum correlations between three bright beams generated by two cascaded FWM processes.The intensity difference squeezing with the cascaded system is enhanced to(-7.0±0.1)d B from the(-5.5±0.1)d B/(4.5±0.1)d B with only one FWM process.Also,this system can be easily extended to multiple modes using multiple FWM processes.Besides,we have also successfully realized a cascade all-optical transistor(AOT),which is driven by a very weak light beam about 800 photons in total.The required probe power for achieving a switching efficiency of 50% can be as low as 180 p W,and it can manipulate a light beam with power of 5.0×106 times more,which proves the cascade of the AOT.Both experiments may find wide applications in quantum information and optical communication.In this paper, we briefly review the recent experimental progresses in quantum optics based on four-wave mixing （FWM） processes in hot rubidium vapor, particularly our two recent experiments in quantum information. We have experimentally produced strong quantum correlations between three bright beams generated by two cascaded FWM processes. The intensity difference squeezing with the cascaded system is enhanced to （-7.0±0.1）dB from the （-5.5±0.1）dB/（-4.5±0.1）dB with only one FWM process. Also, this system can be easily extended to multiple modes using multiple FWM processes. Besides, we have also successfully realized a cascade all-optical transistor （AOT）, which is driven by a very weak light beam about 800 photons in total. The required probe power for achieving a switching efficiency of 50% can be as low as 180 pW, and it can manipulate a light beam with power of 5.0× 10^6 times more, which proves the cascade of the AOT. Both experiments may find wide applications in quantum information and optical communication.

关 键 词：four wave mixing quantum correlations all-optical transistor quantum information and optical communication 

分 类 号：O431.2[机械工程—光学工程]