On-chip Non-Hermitian Cavity Quantum Electrodynamics
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.
Cite
@article{arxiv.2505.05490,
title = {On-chip Non-Hermitian Cavity Quantum Electrodynamics},
author = {Yan Chen and Xudong Wang and Jin Li and Rongbin Su and Kaili Xiong and Xueshi Li and Ying Yu and Tao Zhang and Kexun Wu and Xiao Li and Jiawei Wang and Jiaxiang Zhang and Jin Liu and Tian Jiang},
journal= {arXiv preprint arXiv:2505.05490},
year = {2025}
}