Fault-tolerant dynamically-decoupled hyper-Ramsey spectroscopy of ultra-narrow clock transitions

• URL: http://arxiv.org/abs/2506.23091v3
• Date: Mon, 20 Oct 2025 09:42:20 GMT
• Title: Fault-tolerant dynamically-decoupled hyper-Ramsey spectroscopy of ultra-narrow clock transitions
• Authors: T. Zanon-Willette, B. Ilikj, D. Wilkowski, B. Darquié, N. V. Vitanov,
• Abstract summary: Hyper-Ramsey protocols effectively reduce AC-Stark shifts in probing ultra-narrow optical clock transitions.<n>We address these limitations by incorporating dynamical decoupling.<n>Fault-tolerant dynamically-decoupled SU(2) hyper-clocks are a significant step toward universal, noise-resilient quantum sensors.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Hyper-Ramsey protocols effectively reduce AC-Stark shifts in probing ultra-narrow optical clock transitions but they remain sensitive to laser intensity noise, decoherence, frequency drifts, and low-frequency perturbations. We address these limitations by incorporating dynamical decoupling, using sequences of rotary Hahn-echo pulses that toggle the probe frequency detuning and phase between opposite signs. Implementing time-optimized Eulerian cycling circuits of multiple refocusing pulses, we generate high-contrast hyper-Ramsey interferences that are completely free from AC-Stark shifts and robust against environmental noise and laser probe parameters imperfections. Fault- tolerant dynamically-decoupled SU(2) hyper-clocks are a significant step toward universal, noise-resilient quantum sensors, enabling fault-tolerant metrology for searches about new physics beyond the Standard Model.

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