Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay

被引：182
作者：
Chen, Yi-Hsin [1 ,2 ]
Lee, Meng-Jung [1 ,2 ]
Wang, I-Chung [1 ,2 ]
Du, Shengwang [3 ]
Chen, Yong-Fan [4 ]
Chen, Ying-Cheng [1 ,2 ,5 ]
Yu, Ite A. [1 ,2 ]
机构：
[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
[2] Natl Tsing Hua Univ, Frontier Res Ctr Fundamental & Appl Sci Matters, Hsinchu 30013, Taiwan
[3] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
[4] Natl Cheng Kung Univ, Dept Phys, Tainan 70101, Taiwan
[5] Acad Sinica, Inst Atom & Mol Sci, Taipei 10617, Taiwan
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 08期
关键词：
ELECTROMAGNETICALLY INDUCED TRANSPARENCY; QUANTUM COMMUNICATION; ATOMIC ENSEMBLES; LINEAR OPTICS; REPEATERS; RETRIEVAL; LIGHT;
D O I：
10.1103/PhysRevLett.110.083601
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A high-storage efficiency and long-lived quantum memory for photons is an essential component in long-distance quantum communication and optical quantum computation. Here, we report a 78% storage efficiency of light pulses in a cold atomic medium based on the effect of electromagnetically induced transparency. At 50% storage efficiency, we obtain a fractional delay of 74, which is the best up-to-date record. The classical fidelity of the recalled pulse is better than 90% and nearly independent of the storage time, as confirmed by the direct measurement of phase evolution of the output light pulse with a beat-note interferometer. Such excellent phase coherence between the stored and recalled light pulses suggests that the current result may be readily applied to single photon wave packets. Our work significantly advances the technology of electromagnetically induced transparency-based optical memory and may find practical applications in long-distance quantum communication and optical quantum computation. DOI: 10.1103/PhysRevLett.110.083601
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页数：5
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