We investigate the quantum coherence dynamics of a three-level atom undergoing noninertial motion. Using an open-quantum-system approach, we derive a master equation for an atom coupled to a massless scalar field in vacuum and compare uniform linear acceleration with circular acceleration. For a degenerate $\mathrm{\Lambda }$-type configuration, we show that steady-state coherence can emerge and its value depends not only on the acceleration, but also on the initial atomic state. In the intermediate-acceleration regime, circular acceleration leads to a systematically larger steady-state coherence than uniform linear acceleration, whereas in both the small- and large-acceleration limits the two cases become essentially indistinguishable. Extending the analysis to $V$-type and $\mathrm{\Xi }$-type configurations, we find that the $V$-type system exhibits coherence dynamics closely analogous to the $\mathrm{\Lambda }$-type case, whereas the $\mathrm{\Xi }$-type system behaves qualitatively differently: Its relevant off-diagonal density matrix elements decay exponentially, precluding any steady-state quantum coherence. These results reveal how the noninertial trajectory, acceleration scale, initial-state preparation, and level configuration jointly govern coherence generation and survival in accelerated three-level atoms.

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• Open quantum systems & decoherence
• Quantum fields in curved spacetime
• Unruh effect