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arXiv · 2504.09863

Investigation of Rare-Earth Ion-Photon Interaction and Strong Coupling in Optical Microcavities

Quanshen Shen·Wentao Ji·Junyu Guan·Li Qian·Zihua Chai·ChangKui Duan·Ya Wang·Kangwei Xia
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Abstract

The strong coupling between an emitter and a cavity is significant for advancing quantum networks. Due to their long optical and spin coherence times, rare-earth ions (REIs) represent a compelling platform for quantum networks. However, their inherently weak intra-4f optical transitions typically result in low coupling strength, thus restricting most current achievements to the weak coupling regime. This work proposes a scheme to realize an on-chip quantum network by coupling REIs to high-quality whispering gallery mode (WGM) microcavities. Additionally, we provide numerical validation for a parametric amplification technique to enhance the emitter-cavity coupling strength. As an extension of this approach, the coupled system efficiently achieves the quantum entanglement of local and flying qubits. This study deepens the understanding of emitter-cavity interactions and contributes to realizing REIs-based photonic platforms, which are crucial to distributed quantum computing and developing robust quantum networks.

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Quanshen Shen, Wentao Ji, Junyu Guan, Li Qian, Zihua Chai, ChangKui Duan, Ya Wang, Kangwei Xia. 2025-04-14. Investigation of Rare-Earth Ion-Photon Interaction and Strong Coupling in Optical Microcavities. https://arxiv.org/abs/2504.09863

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