  We propose and analyze an approach for fast syndrome measurements in an array
of rubidium and cesium atomic qubits. The scheme works by implementing an
inter-species $\textsf{CNOT}_k$ gate, entangling one cesium ancilla qubit with
$k\geq 1$ rubidium qubits which are then used for state measurement. Utilizing
Rydberg states with different inter- and intra-species interaction strengths,
the proposal provides a syndrome measurement fidelity of $\mathcal{F}>0.9999$
in less than 5 $\mu$s of integration time.
