Modeling Logical Qubit Performance in the Presence of Physical Crosstalk Noise*

Given the increasing number of experimental logical qubit demonstrations, it is increasingly important to study how physical noise impacts logical qubit performance, especially in the presence of correlated physical noise and at low logical code distance. We use the Logical Qubit Simulator (LoQS) package to numerically study the effects of physical crosstalk noise on logical qubit performance for several quantum error-correcting codes; in particular, we investigate how noise strength and type of crosstalk noise (e.g. gate spillover, always-on interactions) impact the logical qubit.