Atomic clock locking via Bayesian frequency estimation
- URL: http://arxiv.org/abs/2306.06608v2
- Date: Tue, 12 Mar 2024 09:16:11 GMT
- Title: Atomic clock locking via Bayesian frequency estimation
- Authors: Chengyin Han, Zhu Ma, Yuxiang Qiu, Ruihuan Fang, Jiatao Wu, Chang
Zhan, Maojie Li, Jiahao Huang, Bo Lu and Chaohong Lee
- Abstract summary: We develop an adaptive frequency estimation protocol that approaches the Heisenberg scaling.
We achieve robust closed-loop locking of the atomic clock by utilizing our Bayesian frequency estimation protocol.
Our findings hold promising applications in other quantum sensors, such as quantum magnetometers and atomic interferometers.
- Score: 2.877159845954964
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Atomic clocks play a vital role in fundamental science and practical
technology. However, their sensitivity is typically limited by the standard
quantum limit, which is determined by parallel measurements with individual
particles or repeated measurements with a single particle. Overcoming this
limitation requires exploiting correlations between particles or interrogation
times. While it has been demonstrated that sensitivity can be improved to the
Heisenberg limit by utilizing quantum entanglement, it remains unclear whether
the scaling of sensitivity with respect to total interrogation time can achieve
the Heisenberg scaling. Here, we develop an adaptive Bayesian frequency
estimation protocol that approaches the Heisenberg scaling and experimentally
demonstrate its validity with a cold-atom coherent-population-trapping clock.
In further, we achieve robust closed-loop locking of the atomic clock by
utilizing our Bayesian frequency estimation protocol. In comparison with the
conventional clock locking, our Bayesian clock locking yields an improvement of
5.1(4) dB in fractional frequency stability. Our findings not only provide an
alternative approach to locking atomic clocks but also hold promising
applications in other quantum sensors, such as quantum magnetometers and atomic
interferometers.
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