Recovery dynamics of a gap-engineered transmon after a quasiparticle burst
arXiv:2505.08104 · doi:10.1103/ql6q-wfpn
Abstract
Ionizing radiation impacts create bursts of quasiparticle density in superconducting qubits. These bursts temporarily degrade qubit coherence which can be detrimental for quantum error correction. Here, we experimentally resolve quasiparticle bursts in 3D gap-engineered transmon qubits by continuously monitoring qubit transitions. Gap engineering allows us to reduce the burst detection rate by a factor of five. This reduction falls four orders of magnitude short of that expected if the quasiparticles were to quickly thermalize to the cryostat temperature. We associate the limited effect of gap engineering with the slow thermalization of the phonons in our chips after the burst.
27 pages, 16 figures
References in corpus (10)
- Decoherence benchmarking of superconducting qubits
- Measurement and Control of Quasiparticle Dynamics in a Superconducting Qubit
- Non-Poissonian Quantum Jumps of a Fluxonium Qubit due to Quasiparticle Excitations
- Trapping a single vortex and reducing quasiparticles in a superconducting resonator
- Kinetics of non-equilibrium quasiparticle tunneling in superconducting charge qubits
- Microsecond resolution of quasiparticle tunneling in the single-Cooper-pair-transistor
- Energy gap measurement of nanostructured thin aluminium films for use in single Cooper-pair devices
- Parity effect in superconducting aluminum single electron transistors with spatial gap profile controlled by film thickness
- Narrow band microwave radiation from a biased single-Cooper-pair transistor
- Mitigating cosmic ray-like correlated events with a modular quantum processor