Dynamically-decoupled hyper-Ramsey spectroscopy of optical clock transitions

• URL: http://arxiv.org/abs/2506.23091v2
• Date: Wed, 02 Jul 2025 10:10:45 GMT
• Title: Dynamically-decoupled hyper-Ramsey spectroscopy of optical clock transitions
• Authors: T. Zanon-Willette, D. Wilkowski, B. Darquié, N. V. Vitanov,
• Abstract summary: Hyper-Ramsey protocols have been successfully implemented on ultra-narrow optical clock transitions.<n>We address the limitations by employing dynamical-decoupling methods composed by multiple rotary Hahn-echo pulses.<n>Time-optimized Uhrig sequences of refocusing pulses produce highly contrasted and robust hyper-Ramsey interferences.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Hyper-Ramsey protocols have been successfully implemented on ultra-narrow optical clock transitions to reduce systematic frequency-shifts induced by AC-Stark shift and amplitude pulse variation. However, the compensation remains imperfect against laser probe intensity fluctuation, decoherence and unsuited for external quasi-static or low frequency noise perturbations. Here, we address these limitations by employing dynamical-decoupling methods composed by multiple rotary Hahn-echo pulses toggling probe frequency detunings between opposite signs during interrogating laser pulses. Time-optimized Uhrig sequences of refocusing pulses produce highly contrasted and robust hyper-Ramsey interferences against low-frequency noise distortions caused by environmental factors and imperfections in the probe parameters. Dynamically-decoupled SU(2) hyper-clocks pave the way to universal noise-resilient quantum sensors, unveiling fault-tolerant quantum metrology to track fundamental symmetries and search for new physics beyond the Standard Model.

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