Quasieigenstate Coalescence in an Atom-Cavity Quantum Composite

Youngwoon Choi, Sungsam Kang, Sooin Lim, Wookrae Kim, Jung-Ryul Kim, Jai-Hyung Lee, and Kyungwon An
Phys. Rev. Lett. 104, 153601 – Published 13 April 2010
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Abstract

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 4π symmetry was demonstrated. Consequently, the cavity transmission at the quasieigenstate was observed to exhibit a critical behavior at the EP.

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  • Received 8 December 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.153601

©2010 American Physical Society

Authors & Affiliations

Youngwoon Choi, Sungsam Kang, Sooin Lim, Wookrae Kim, Jung-Ryul Kim, Jai-Hyung Lee, and Kyungwon An*

  • School of Physics and Astronomy, Seoul National University, Seoul, 151-747, Korea

  • *Kwan@phya.snu.ac.kr

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Issue

Vol. 104, Iss. 15 — 16 April 2010

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