Fast, high-fidelity neutral atom qubit detection with optical Fock states

State readout remains a significant bottleneck in neutral atom quantum computing, with

timescales often exceeding gate operations by orders of magnitude. We propose a readout pro-

tocol utilizing trains of optical Fock states to perform absorption spectroscopy, circumventing the

shot-noise limits inherent to classical coherent states. By analyzing the binomial statistics of single-

photon transmission, we show that high-fidelity readout can be achieved with tens of incident photons.

This approach allows for sub-10 μs detection times in free space, while drastically reducing heating and crosstalk

 compared to standard fluorescence methods. We present a theoretical framework and numerical simulations

 mapping the fidelity across the parameter space of atom-photon coupling and collection efficiency.