Lamb shift as a witness for quantum noninertial effects

This is the authors' abstract. We don't add key points for this paper.

The sustained intense experimental activity around atomic spectroscopy and the resulting high-precision measurements of atomic spectral lines attracts interest in Lamb shift as a witness for noninertial effects in quantum systems. We investigate the Lamb shift in a two-level system, undergoing uniform circular motion, coupled to a quantum electromagnetic field inside a cavity. We show that when the separation between different cavity modes is large compared to the width of each cavity mode, both the inertial and purely noninertial contributions to the Lamb shift are convergent. In addition, we find that the purely noninertial Lamb shift maximizes away from the atomic resonance by an amount decided by the angular frequency of the circulating atom, lending itself to efficient enhancement by suitably tuning the cavity parameters. We argue that the purely noninertial contribution becomes detectable at accelerations ~10¹⁴ m/s².