151391 20251017144630.0 doi 10.1088/1367-2630/adaedc sideral 143095 ART-2025-143095 eng Bertoldo, Elia Cosmic muon flux attenuation methods for superconducting qubit experiments 2025 Access copy available to the general public Unrestricted We propose and demonstrate two practical mitigation methods to attenuate the cosmic muon flux, compatible with experiments involving superconducting qubits: shallow underground sites and device orientation. Using a specifically-built cosmic muon detector, we identify underground sites, widely present in urban environments, where significant attenuation of cosmic muon flux, up to a factor 35 for 100 m depths, can be attained. Furthermore, we employ two germanium wafers in an above-ground laboratory, each equipped with a particle sensor, to show how the orientation of a chip with respect to the sky affects the amount and type of energy deposited on the substrate by ionizing radiation. We observe that the horizontal detector sees more counts at lower energy, while the vertical one is impacted by more particles at higher energy. The methods here described proposed ways to directly understand and reduce the effects of cosmic rays on qubits by attenuating the source of this type of decoherence, complementing existing on-chip mitigation strategies. We expect that both on-chip and off-chip methods combined will become ubiquitous in quantum technologies based on superconducting qubit circuits. info:eu-repo/grantAgreement/EC/H2020/899561/EU/ANNEALING-BASED VARIATIONAL QUANTUM PROCESSORS/AVaQus This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 899561-AVaQus info:eu-repo/grantAgreement/ES/MICINN/PCI2019-111838-2 info:eu-repo/grantAgreement/ES/MICINN/PID2021-122140NB-C31 info:eu-repo/grantAgreement/ES/MICINN/RYC2019-028482-I info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Pérez Sánchez, Victor Martínez, Maria Universidad de Zaragoza (orcid)0000-0002-9043-4691 Martínez, Manel Khalife, Hawraa Forn-Díaz, Pol 2004 390 Universidad de Zaragoza Dpto. Física Teórica Área Física Atóm.Molec.y Nucl. 27, 2 (2025), 023014 [15 pp.] New j. phys. New Journal of Physics 1367-2630 2189122 http://zaguan.unizar.es/record/151391/files/texto_completo.pdf Versión publicada 2632491 http://zaguan.unizar.es/record/151391/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:151391 articulos driver 2025-10-17-14:25:48 ARTICLE