Atomic clock locking with Bayesian quantum parameter estimation: Scheme and experiment

作者：Chengyin Han, Zhu Ma, Yuxiang Qiu, Ruihuan Fang, Jiatao Wu, Zhan Chang, Maojie Li, Jiahao Huang, Bo Lü, Chaohong Lee · 发表于：Physical Review Applied · 年份：2024 · DOI：10.1103/physrevapplied.22.044058 · 被引用次数：12 · 研究领域：Atomic and Subatomic Physics Research、Advanced Frequency and Time Standards、Cold Atom Physics and Bose-Einstein Condensates

Atomic clocks are crucial for fundamental science and practical technology, but their sensitivity is often constrained by the standard quantum limit. With a cold-atom coherent-population-trapping clock, the authors design and experimentally demonstrate an adaptive Bayesian quantum frequency estimation protocol that approaches the Heisenberg scaling with respect to total interrogation time. This atomic clock also yields improved fractional frequency stability and enhanced robustness against technical noises. This work provides a high-precision approach to atomic clock locking, and holds promising applications in various interferometry-based quantum sensors.