超越Pound-Drever-Hall极限的鲁棒腔计量学
Robust cavity metrology beyond the limits of Pound-Drever-Hall
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中文总结 AI 辅助
该研究针对PDH光谱法的系统误差问题，提出利用三音相位最优线性组合的鲁棒腔计量方法，在光与微波频段实验验证其可消除PDH的系统误差，还实现了超导量子比特单次读出。
中文摘要 AI 辅助
微波与光学腔谐振频率的精确测量是量子技术领域的基础能力。目前性能最高的方法之一是Pound-Drever-Hall（PDH）光谱法，该方法采用三音探测，可消除对光路长度波动的敏感性。然而，PDH因残留振幅调制和解调相位误差会出现系统偏移。本文利用三个探测音相位的最优线性组合，提出一种鲁棒腔计量方法，消除了PDH对显著系统误差的敏感性。我们在光学和微波频段均实验实现了鲁棒腔测量，结果表明其对边带不平衡和解调相位不敏感，还演示了腔耦合超导量子比特的单次读出。
英文摘要
Precise measurement of the resonance frequencies of microwave and optical cavities is a foundational capability across quantum technologies. One of the highest-performance methods currently available is Pound-Drever-Hall (PDH) spectroscopy, which relies on a three-tone interrogation and eliminates sensitivity to path-length fluctuations. However, PDH is known to suffer from systematic offsets due to residual amplitude modulation and demodulation-phase errors. Here we leverage an optimal linear combination of the phases of the three interrogation tones to implement a method for robust cavity metrology which eliminates significant systematic-error sensitivities of PDH. We experimentally demonstrate robust cavity measurements in both the optical and microwave frequency regime, showing insensitivity to sideband imbalance and demodulation phase, as well as demonstrating single-shot readout of a cavity-coupled superconducting qubit.
