Speaker
Description
Spatiotemporally correlated error bursts, arising from quasiparticles generated by ionizing radiation and mechanical noise, pose significant challenges to implementing quantum error correction in superconducting quantum processors. In this work, we explore methods for detecting these errors in two superconducting circuits: offset charge sensitive (OCS) transmons and Fluxonium. In OCS transmons, a circuit ideal for sensing quasiparticle tunneling, we demonstrate a novel approach to directly measure charge variations across the junction using a direct-dispersive shift of the readout resonator using voltage modulation. This technique enables continuous measurement of charge parity and offset charge, key indicators of correlated errors, without requiring recalibration. In Fluxonium, a promising circuit for high performance processors, we investigate spatiotemporally correlated errors and analyze their behavior under varying applied flux to gain deeper insights into the effects of non-equilibrium quasiparticles on device performance. These findings contribute to advancing error detection and mitigation strategies for next-generation quantum processors.
