Third-order exceptional point in an ion–cavity system

We investigate a scheme for observing the third-order exceptional point (EP3) in an ion–cavity setting. In the lambda-type level configuration, the ion is driven by a pump field, and the resonator is probed with another weak laser field. We exploit the highly asymmetric branching ratio of an ion...

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Bibliographic Details
Published in:Applied physics letters 2023-10, Vol.123 (16)
Main Authors: Kim, Jinuk, Ha, Taegyu, Kim, Donggeon, Lee, Dowon, Lee, Ki-Se, Won, Jongcheol, Moon, Youngil, Lee, Moonjoo
Format: Article
Language:English
Subjects:
Applied physics
Eigenvalues
Rabi frequency
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Summary:We investigate a scheme for observing the third-order exceptional point (EP3) in an ion–cavity setting. In the lambda-type level configuration, the ion is driven by a pump field, and the resonator is probed with another weak laser field. We exploit the highly asymmetric branching ratio of an ion's excited state to satisfy the weak-excitation limit, which allows us to construct the non-Hermitian Hamiltonian ( H nH ). Via fitting the cavity-transmission spectrum, the eigenvalues of H nH are obtained. The EP3 appears at a point where the Rabi frequency of the pump laser and the atom-cavity coupling constant balance the loss rates of the system. Feasible experimental parameters are provided.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0168372