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- W3093523237 abstract "Abstract The frequency stability of many optical atomic clocks is limited by the coherence of their local oscillator. Here, we present a measurement protocol that overcomes the laser coherence limit. It relies on engineered dynamical decoupling of laser phase noise and near-synchronous interrogation of two clocks. One clock coarsely tracks the laser phase using dynamical decoupling; the other refines this estimate using a high-resolution phase measurement. While the former needs to have a high signal-to-noise ratio, the latter clock may operate with any number of particles. The protocol effectively enables minute-long Ramsey interrogation for coherence times of few seconds as provided by the current best ultrastable laser systems. We demonstrate implementation of the protocol in a realistic proof-of-principle experiment, where we interrogate for 0.5 s at a laser coherence time of 77 ms. Here, a single lattice clock is used to emulate synchronous interrogation of two separate clocks in the presence of artificial laser frequency noise. We discuss the frequency instability of a single-ion clock that would result from using the protocol for stabilisation, under these conditions and for minute-long interrogation, and find expected instabilities of σ y ( τ ) = 8 × 10 −16 ( τ /s) −1/2 and σ y ( τ ) = 5 × 10 −17 ( τ /s) −1/2 , respectively." @default.
- W3093523237 created "2020-10-29" @default.
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- W3093523237 date "2020-10-20" @default.
- W3093523237 modified "2023-10-10" @default.
- W3093523237 title "Dynamical decoupling of laser phase noise in compound atomic clocks" @default.
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- W3093523237 doi "https://doi.org/10.1038/s42005-020-00452-9" @default.
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