Genuine Tripartite Strong Coupling in a Superconducting-Spin Hybrid Quantum System

• URL: http://arxiv.org/abs/2512.13129v1
• Date: Mon, 15 Dec 2025 09:40:17 GMT
• Title: Genuine Tripartite Strong Coupling in a Superconducting-Spin Hybrid Quantum System
• Authors: Yingqiu Mao, Han-Yu Ren, Zi-Yi Liu, Yi-Zheng Zhen, Tao Rong, Tao Jiang, Zhuo Chen, Zhe-Heng Yuan, Wen-Hua Qin, Xiaoran Zhang, Xiaobing Liu, Ming Gong, Kae Nemoto, William J. Munro, Johannes Majer,
• Abstract summary: Solid-state hybrid quantum system comprises a superconducting transmon qubit, a fixed-frequency coplanar-waveguide resonator, and an ensemble of NV$-$ centers in diamond.<n> Frequency-domain spectroscopy reveals a characteristic three-mode avoided crossing, indicating that single excitations are coherently shared across all three subsystems.
• Score: 14.82990573359188
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate genuine tripartite strong coupling in a solid-state hybrid quantum system comprising a superconducting transmon qubit, a fixed-frequency coplanar-waveguide resonator, and an ensemble of NV$^-$ centers in diamond. Frequency-domain spectroscopy reveals a characteristic three-mode avoided crossing, indicating that single excitations are coherently shared across all three subsystems. At higher probe powers, we observe nonlinear features including multiphoton transitions and signatures of transmon-${}^{14}\mathrm{N}$ nuclear-spin interactions, highlighting the accessibility of higher-excitation manifolds in this architecture. These results establish a new regime of hybrid cavity QED that integrates superconducting and spin degrees of freedom, providing a platform for exploring complex multicomponent dynamics and developing hybrid quantum interfaces.

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