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arXiv · 2505.05490

On-chip Non-Hermitian Cavity Quantum Electrodynamics

Yan Chen·Xudong Wang·Jin Li·Rongbin Su·Kaili Xiong·Xueshi Li·Ying Yu·Tao Zhang·Kexun Wu·Xiao Li·Jiawei Wang·Jiaxiang Zhang·Jin Liu·Tian Jiang
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Abstract

Exceptional points (EPs) promise revolutionary control over quantum light-matter interactions. Here, we experimentally demonstrate flexible and reversible engineering of quantum vacuum fluctuation in an integrated microcavity supporting chiral Eps. We develop a hybrid lithium niobate (LN)-GaAs quantum photonic platform, seamlessly combining high-quality quantum emitters, a low-loss photonic circuit, efficient electro-optic (EO) effect, and local strain actuator in a single device. Chiral EPs are implemented by dynamically tuning the coupling between the modes associated with a micro-ring resonator, resulting in anomalous spontaneous emission dynamic with a 7-fold modulation of the lifetime (120 ps to 850 ps). Meanwhile, we reshape single-photon spectra via cavity local density of states (LDOS) engineering and generate non-Lorentzian spectral profiles: squared-Lorentzian, Fano-like, and EP-induced transparency (EPIT), a suppression of emission at zero detuning. This work unveils exotic cavity quantum electrodynamics (cQED) effects unique to EPs and establishes a universal paradigm for non-Hermitian quantum photonics.

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Yan Chen, Xudong Wang, Jin Li, Rongbin Su, Kaili Xiong, Xueshi Li, Ying Yu, Tao Zhang, Kexun Wu, Xiao Li, Jiawei Wang, Jiaxiang Zhang, Jin Liu, Tian Jiang. 2025-05-02. On-chip Non-Hermitian Cavity Quantum Electrodynamics. https://arxiv.org/abs/2505.05490

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