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Reducing the impact of radioactivity on quantum circuits in a deep-underground facility

Cardani, L.; Valenti, F. 1; Casali, N.; Catelani, G.; Charpentier, T. 2; Clemenza, M.; Colantoni, I.; Cruciani, A.; D’Imperio, G.; Gironi, L.; Grünhaupt, L. 2; Gusenkova, D. 2; Henriques, F. 2; Lagoin, M. 2; Martinez, M.; Pettinari, G.; Rusconi, C.; Sander, O. 1; Tomei, C.; ... mehr

As quantum coherence times of superconducting circuits have increased from nanoseconds to hundreds of microseconds, they are currently one of the leading platforms for quantum information processing. However, coherence needs to further improve by orders of magnitude to reduce the prohibitive hardware overhead of current error correction schemes. Reaching this goal hinges on reducing the density of broken Cooper pairs, so-called quasiparticles. Here, we show that environmental radioactivity is a significant source of nonequilibrium quasiparticles. Moreover, ionizing radiation introduces time-correlated quasiparticle bursts in resonators on the same chip, further complicating quantum error correction. Operating in a deep-underground lead-shielded cryostat decreases the quasiparticle burst rate by a factor thirty and reduces dissipation up to a factor four, showcasing the importance of radiation abatement in future solid-state quantum hardware.

Verlagsausgabe §
DOI: 10.5445/IR/1000133546
Veröffentlicht am 03.06.2021
DOI: 10.1038/s41467-021-23032-z
Zitationen: 20
Zitationen: 32
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Institut für Quantenmaterialien und -technologien (IQMT)
Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000133546
HGF-Programm 47.12.03 (POF IV, LK 01) Quantum-Computer Control Systems and Cryoelectronics
Erschienen in Nature Communications
Verlag Nature Research
Band 12
Heft 1
Seiten Art.-Nr.: 2733
Vorab online veröffentlicht am 12.05.2021
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