Quasieigenstate Coalescence in an Atom-Cavity Quantum Composite

被引：158
|
作者：
Choi, Youngwoon [1 ]
Kang, Sungsam [1 ]
Lim, Sooin [1 ]
Kim, Wookrae [1 ]
Kim, Jung-Ryul [1 ]
Lee, Jai-Hyung [1 ]
An, Kyungwon [1 ]
机构：
[1] Seoul Natl Univ, Sch Phys & Astron, Seoul 151747, South Korea
来源：
PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 15期
关键词：
EXCEPTIONAL POINTS; SINGLE-PHOTON; LASER; DOT;
D O I：
10.1103/PhysRevLett.104.153601
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the first direct observation of an exceptional point (EP) in an open quantum composite of a single atom and a high-Q cavity mode. The atom-cavity coupling constant was made a continuous variable by utilizing the multisublevel nature of a single rubidium atom when it is optimally coupled to the cavity mode. The spectroscopic properties of quasieigenstates of the atom-cavity composite were experimentally investigated near the EP. Branch-point singularity of quasieigenenergies was observed and its 4 pi symmetry was demonstrated. Consequently, the cavity transmission at the quasieigenstate was observed to exhibit a critical behavior at the EP.
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页数：4
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