Speaker
Description
Quantum error correction (QEC) protocols for superconducting qubits assume spatially and temporally uncorrelated decoherence events. However, recent evidence has seen large chip disruption due to cosmic rays. Some of these events are mitigated by gap engineering the qubits, but some effects still remain. We present a platform that sandwiches a superconducting transmon qubit between two microwave kinetic inductance detector (MKID) arrays, enabling real-time detection of radiation-induced phonon bursts. By synchronizing MKID event detection with single-shot measurements of qubit energy relaxation and phase coherence, we observe statistically significant reductions in coherence parameters immediately following dual MKID events which we attribute to penetrating muons. Interestingly, our timescales for recovery are much shorter than other events seen in the literature. We will discuss the recovery dynamics and simulations that connect different types of events with qubit and MKID response, as well as future experiments being planned using our platform.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344
