# Fast non-destructive parallel readout of neutral atom registers in optical potentials

## TL;DR

This paper presents a fast, scalable, and non-destructive method for reading out the quantum states of neutral atoms in optical traps using state-selective fluorescence and Bayesian image analysis, suitable for quantum computing.

## Contribution

The authors introduce a novel, scalable imaging technique combining fluorescence detection with Bayesian inference for non-destructive readout of dense neutral atom arrays.

## Key findings

- Detection fidelity exceeds 98% within 10 ms
- Maintains 99% atom trapping during readout
- Applicable to large-scale quantum registers

## Abstract

We demonstrate the parallel and non-destructive readout of the hyperfine state for optically trapped $^{87}$Rb atoms. The scheme is based on state-selective fluorescence imaging and achieves detection fidelities $>$98% within 10$\,$ms, while keeping 99% of the atoms trapped. For the read-out of dense arrays of neutral atoms in optical lattices, where the fluorescence images of neighboring atoms overlap, we apply a novel image analysis technique using Bayesian inference to determine the internal state of multiple atoms. Our method is scalable to large neutral atom registers relevant for future quantum information processing tasks requiring fast and non-destructive readout and can also be used for the simultaneous read-out of quantum information stored in internal qubit states and in the atoms' positions.