Realizing biased noise syndrome measurement in a repetition code of cat qubits

In [Putterman et al., arXiv:2409.13025] we realize a hardware efficient error correcting code using biased noise cat qubits. Specifically we concatenate a cat qubit encoding with a repetition code. The repetition code protects against phase-flip flip errors while bit-flip errors are natively suppressed by the cat qubits. Importantly all operations in the circuit including the CX gates need to preserve the bias against bit-flip errors. In this presentation we discuss device and calibration considerations that are important to ensure that bit-flips remain suppressed during simultaneous stabilizer measurement.