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This study utilizes Monte Carlo simulations via Geant4 to project radiation exposure for superconducting qubits within SNOLAB's ultra-low background environment. By characterizing specific spectral components and particle interactions rather than just total dose, the research aims to isolate how underground shielding impacts quantum coherence compared to surface operations. These findings are critical for validating error correction assumptions in future deep-earth quantum processors where single high-energy events can cascade across multiple qubits.

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Material Assays Project Radiation Rates for SNOLAB Qubit Measurements

Quantum ZeitgeistJuly 20, 20265 min read

Material assays at SNOLAB, shielded by 2km of rock, project radiation rates for superconducting qubit operation and quantum coherence studies.

Shielded by two kilometers of rock, the Cryogenic Underground TEst (CUTE) facility at SNOLAB is designed to provide an ultra-low radiation environment for probing quantum coherence in superconducting qubits. A team of researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo, including Y. Ahmed, B. Binoy, and R. Bunker, has completed an extensive material assaying program in preparation for operating superconducting qubits underground, meticulously characterizing potential sources of interference. The work reports on a thorough Monte Carlo study utilizing the Geant4 particle physics tracking code to project radiation exposure for these sensitive quantum devices. Researchers further characterized the spectral components of the…

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