Analysis of a neutral atom surface code with two atomic species

We report on analysis of a neutral atom implementation of the surface code using two atomic species. Quantum error correction using the surface code, or other codes, relies on ancilla qubits that detect an error syndrome and measurement of the ancillas without disturbing data qubits, followed by correction of the data qubits. A challenge for many architectures, including neutral atoms, is measurement crosstalk that corrupts data qubits when measuring ancillas. We have analyzed a two-species implementation using Cs atoms for the data, and Rb atoms for the ancilla. The difference in resonant wavelengths of  the two species makes crosstalk free optical measurement practical.  A novel repumping scheme is used to mitigate leakage errors to Zeeman states outside the computational basis. Using a numerical code that implements surface 13 we will report on code performance with realistic gate parameters.