We investigate enantiodetection for both a single cyclic three-level chiral molecule and a mixture of a finite number of chiral molecules by monitoring the steady-state intracavity photon number in a cavity-QED platform. Our scheme exploits the intrinsic global $\pi$-phase difference between opposite enantiomers to engineer destructive or constructive interference pathways, enabling a direct readout of enantiomeric excess with an error below $5\%$ and exhibiting robustness against energy-level dissipation. To capture mesoscopic many-molecule effects beyond mean field while avoiding brute-force master-equation simulations, we employ a generalized discrete truncated Wigner approximation, which is well suited for systems with many yet a finite number of molecules. These results pave the way for implementing enantiodetection in realistic quantum-optical settings.

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• Cavity quantum electrodynamics
• Open quantum systems
• Quantum optics
• Quantum sensing