Data underpinning "Error threshold in active steering protocols for few-qubit systems"

We provide the raw data used to produce plots shown in our paper "Error threshold transitions in active steering protocols".

Abstract

We study active steering protocols for weakly measured qubits in the presence of error channels due to amplitude and phase noise. If the error rate is sufficiently small, the protocol approaches and stabilizes a predesignated pure target state with high fidelity and high purity, and thus implements autonomous error correction. We present numerical simulation results for one and two qubits,  taking Andreev qubit circuits as example. As function of the error rate, a sharp threshold separates an error-correcting weak-damping regime from astrong-damping regime where the target state cannot be reached anymore. At the threshold, the purity gap closesand a peak appears in the coherent information.