Li Ruixin, An Bingnan, Jiao Nanjing, Liu Junyang, Chen Lirong, Wang Yajun, Zheng Yaohui
State Key Laboratory of Quantum Optics Technologies and Devices, Institute of Opto-Electronics, Shanxi University, 030006, Taiyuan, China.
Collaborative Innovation Center of Extreme Optics, Shanxi University, 030006, Taiyuan, Shanxi, China.
Light Sci Appl. 2025 Sep 8;14(1):310. doi: 10.1038/s41377-025-02013-7.
The dominant technical noise of a free-running laser practically limits bright squeezed light generation, particularly within the MHz band. To overcome this, we develop a comprehensive theoretical model for nonclassical power stabilization, and propose a novel bright squeezed light generation scheme incorporating hybrid power noise suppression. Our approach integrates broadband passive power stabilization with nonclassical active stabilization, extending the feedback bandwidth to MHz frequencies. This hybrid technique achieves an additional 9 dB technical noise suppression, establishing critical prerequisites for broadband bright squeezed light generation. Finally, a -5.5 dB bright squeezed light at 1 mW with kHz-MHz squeezing bandwidth was generated. The experimental results show excellent agreement with theoretical predictions, which represent we have comprehensively demonstrated a milliwatt-order bright squeezed light across kHz-MHz frequencies. Our work enables new quantum metrology applications and paves the way for next-generation quantum-enhanced technologies. Nonclassical hybrid passive-active power stabilization enables milliwatt-level bright squeezing across kHz-MHz band.
自由运转激光器的主要技术噪声实际上限制了明亮压缩光的产生，尤其是在兆赫兹频段内。为了克服这一问题，我们开发了一种用于非经典功率稳定的综合理论模型，并提出了一种结合混合功率噪声抑制的新型明亮压缩光产生方案。我们的方法将宽带无源功率稳定与非经典有源稳定相结合，将反馈带宽扩展到兆赫兹频率。这种混合技术实现了额外9分贝的技术噪声抑制，为宽带明亮压缩光的产生奠定了关键前提条件。最终，产生了在1毫瓦功率下、具有千赫兹至兆赫兹压缩带宽的-5.5分贝明亮压缩光。实验结果与理论预测高度吻合，这表明我们已经全面展示了跨越千赫兹至兆赫兹频率的毫瓦级明亮压缩光。我们的工作推动了新的量子计量应用，并为下一代量子增强技术铺平了道路。非经典混合无源-有源功率稳定实现了跨越千赫兹至兆赫兹频段的毫瓦级明亮压缩。
