Cosmic muon flux attenuation methods for superconducting qubit experiments
Bertoldo, Elia (Institut de Física d'Altes Energies)
Pérez Sánchez, Victor (Laboratorio Subterráneo de Canfranc)
Martínez, Maria (Universidad de Zaragoza)
Martínez Rodríguez, Manel (Institut de Física d'Altes Energies)
Khalife, Hawraa (Université Paris-Saclay)
Forn-Díaz, Pol (Institut de Física d'Altes Energies)

Date:	2025
Abstract:	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.
Grants:	Agencia Estatal de Investigación RYC2019-028482-I Agencia Estatal de Investigación PCI2019-111838-2 Agencia Estatal de Investigación PID2021-122140NB-C31 European Commission 899561 Agencia Estatal de Investigación FJC2021-046443-I
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Quantum computing ; Muons ; Cosmic rays ; Ionizing radiation ; Superconducting qubits ; Qubits
Published in:	New journal of physics, Vol. 27 (February 2025) , art. 023014, ISSN 1367-2630

DOI: 10.1088/1367-2630/adaedc

16 p, 2.3 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut de Física d’Altes Energies (IFAE)
Articles > Research articles
Articles > Published articles