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Suppressing decoherence of superconducting qubits by trapping non-equilibrium quasiparticles

Yvonne Y. Gao, Chen Wang, Ioan M. Pop +9 more

Bulletin of the American Physical SocietyMar 6, 20150 citations

Measuring and controlling quasiparticles in superconducting qubits

Gianluigi Catelani

Jan 1, 20170 citations

Measurement and control of quasiparticle dynamics in a superconducting qubit

Chen Wang, Yvonne Y. Gao, Ioan M. Pop +9 more

arXiv:1406.7300Nature CommunicationsDec 18, 2014229 citations

Measuring quasiparticle dynamics for particle impact reconstruction in a superconducting qubit chip

E. Celi, R. Linehan, P. M. Harrington +7 more

Quasiparticle poisoning following particle impacts poses a significant challenge to the development of fault-tolerant superconducting quantum computers, as a sudden excess of quasiparticles can simultaneously degrade the coherence of multiple qubits across large device arrays. In this work, we present a statistical analysis that models the time evolution of radiation-induced qubit energy relaxation through quasiparticle density dynamics. This study provides insight into quasiparticle loss processes by distinguishing between recombination and trapping decay channels and assessing their respective impact on qubit performance. We precisely measure quasiparticle recombination in multiple transmon qubits and uncover an unexpected dependence of qubit relaxation dynamics on deposited energy. By linking correlated relaxation events across qubits to ballistic phonon propagation, we introduce a statistical localization approach to extract the energy deposited in the substrate, which is in good agreement with Monte Carlo simulation. This work establishes the quantitative framework for using an arbitrary subset of superconducting transmon qubits in a QPU as energy-resolving witness particle detectors.Quasiparticle poisoning following particle impacts poses a significant challenge to the development of fault-tolerant superconducting quantum computers, as a sudden excess of quasiparticles can simultaneously degrade the coherence of multiple qubits across large device arrays. In this work, we present a statistical analysis that models the time evolution of radiation-induced qubit energy relaxation through quasiparticle density dynamics. This study provides insight into quasiparticle loss processes by distinguishing between recombination and trapping decay channels and assessing their respective impact on qubit performance. We precisely measure quasiparticle recombination in multiple transmon qubits and uncover an unexpected dependence of qubit relaxation dynamics on deposited energy. By linking correlated relaxation events across qubits to ballistic phonon propagation, we introduce a statistical localization approach to extract the energy deposited in the substrate, which is in good agreement with Monte Carlo simulation. This work establishes the quantitative framework for using an arbitrary subset of superconducting transmon qubits in a QPU as energy-resolving witness particle detectors.

quant-pharXiv:2604.13176Apr 16, 20260 citations

Single Flux Quantum-Based Superconducting Qubit Control and Quasiparticle Mitigation: Part 2

A. Ballard, Vito Iaia, Tianna McBroom +21 more

Bulletin of the American Physical SocietyMar 17, 20210 citations

Superconducting Qubit Control with Single Flux Quantum Pulses in A Multichip Module: Part II Qubit and Quasiparticle Measurement

Kenneth Dodge, A. Ballard, Caleb Howington +13 more

Bulletin of the American Physical SocietyMar 7, 20191 citation

Measurement of recombination and single-vortex trapping of quasiparticles in a superconducting qubit

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