Quasieigenstate Coalescence in an Atom-Cavity Quantum Composite

被引：165

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.

引用

页数：4

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