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Precise estimation of the coupling strength between two nanomechanical modes from four Ramsey fringes
Anh Tuan Le, Avishek Chowdhury, Hugo Ribeiro, Eva M. Weig·January 19, 2026
Quantum PhysicsMesoscale Physics
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Abstract
We experimentally determine the coupling strength between two strongly coupled nanomechanical modes using a Ramsey-inspired technique optimized for signals as short as four fringes. The method is applied to precisely probe the change of the coupling rate induced by a modification of the microwave-cavity readout field. It opens a pathway towards sensing electrostatic field fluctuations approaching single-charge resolution.