Radioactivity was recently discovered as a source of decoherence and correlated errors for the real-world implementation of superconducting quantum processors. In this work, we measure levels of radioactivity present in a typical laboratory environment (from muons, neutrons, and γ-rays emitted by naturally occurring radioactive isotopes) and in the most commonly used materials for the assembly and operation of state-of-the-art superconducting qubits. We present a GEANT-4 based simulation to predict the rate of impacts and the amount of energy released in a qubit chip from each of the mentioned sources. We finally propose mitigation strategies for the operation of next-generation qubits in a radio-pure environment.
Disentangling the sources of ionizing radiation in superconducting qubits / Cardani, L., Colantoni, I., Cruciani, A., De Dominicis, F., D'Imperio, G., Laubenstein, M., Mariani, A., Pagnanini, L., Pirro, S., Tomei, C., Casali, N., Ferroni, F., Frolov, D., Gironi, L., Grassellino, A., Junker, M., Kopas, C., Lachman, E., Mcrae, C.R.H., Mutus, J., et al.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 83:1(2023). [10.1140/epjc/s10052-023-11199-2]
Disentangling the sources of ionizing radiation in superconducting qubits
Cardani L.
;Colantoni I.;D'Imperio G.;Pagnanini L.;Casali N.;Pettinacci V.;Vignati M.;
2023
Abstract
Radioactivity was recently discovered as a source of decoherence and correlated errors for the real-world implementation of superconducting quantum processors. In this work, we measure levels of radioactivity present in a typical laboratory environment (from muons, neutrons, and γ-rays emitted by naturally occurring radioactive isotopes) and in the most commonly used materials for the assembly and operation of state-of-the-art superconducting qubits. We present a GEANT-4 based simulation to predict the rate of impacts and the amount of energy released in a qubit chip from each of the mentioned sources. We finally propose mitigation strategies for the operation of next-generation qubits in a radio-pure environment.| File | Dimensione | Formato | |
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