Our path to practical quantum computing relies on quantum error correction and the construction of large qubit arrays. The physical errors in these devices must be both small and uncorrelated for logical errors to be suppressed. Impacts from high energy radiation violate both these assumptions. Impinging particles ionizes the substrate, radiating high energy phonons that induce a burst of quasiparticles, severely limiting qubit coherence throughout the device. Using a new measurement technique, we have identified these impact events in our devices, finding large bursts of correlated error that last for thousands of error correction cycles. By tracking the evolution of these events, we can understand the underlying physical dynamics and learn to mitigate these impacts and enable future quantum error correction experiments.
Speakers: Xiao Mi, Charles Neill, Matthew McEwen, Jimmy Chen
product: Quantum – General; event: Quantum Summer Symposium 2021; fullname: Xiao Mi, Charles Neill, Matthew McEwen, Jimmy Chen; re_ty: Publish;