Quasieigenstate coalescence in an atom-cavity quantum composite

Youngwoon Choi; Sungsam Kang; Sooin Lim; Wookrae Kim; Jung Ryul Kim; Jai Hyung Lee; Kyungwon An

doi:10.1103/PhysRevLett.104.153601

Quasieigenstate coalescence in an atom-cavity quantum composite

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

Research output: Contribution to journal › Article › peer-review

72 Citations (Scopus)

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.

Original language	English
Article number	153601
Journal	Physical review letters
Volume	104
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.104.153601
Publication status	Published - 2010 Apr 13

ASJC Scopus subject areas

Physics and Astronomy(all)

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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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AU - Choi, Youngwoon

AU - Kang, Sungsam

AU - Lim, Sooin

AU - Kim, Wookrae

AU - Kim, Jung Ryul

AU - Lee, Jai Hyung

AU - An, Kyungwon

PY - 2010/4/13

Y1 - 2010/4/13

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AB - 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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