QND-preserving readout tune-up with active crosstalk mitigation

Readout of superconducting quantum circuits capable of error correction faces two major challenges: state leakage and crosstalk. Strong probe tones can lead to state leakage, compromising the quantum non-demolition (QND) nature of the measurement. Error correction, however, requires QND-preserving readout operations on large systems without significant crosstalk to preserve the encoded quantum state over multiple correction cycles. In this talk, we address several aspects of this challenge. First, we present an automated and scalable tune-up protocol designed to preserve QNDness while minimizing leakage. Next, we identify the dominant crosstalk channel in our readout architecture and propose an active crosstalk mitigation approach that further improves the QNDness of the readout operation.