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DOE OSTI · 1975752

A Radiation-Shielded, Shallow Underground, Long-Coherence Time Quantum Qubit Concept

Loer, Ben M.·Archambault, Brian C.·Fuller, Erin S.·Pierson, Bruce D.
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Abstract

Ionizing radiation from ambient radioactivity has been shown to reduce the coherence time of superconducting qubits. Qubit performance can be improved by shielding the system from external radiation: operating the system underground to reduce cosmic rays, and use of lead shielding to reduce ambient gammas. Here we present a design for a lead shield optimized for a dilution refrigerator operating in PNNL's Shallow Underground Laboratory. The shield reduces the ambient gamma flux by approximately 99.8%, so that cosmic ray muons dominate the ionizing radiation input to the qubits.

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42 ENGINEERING75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY97 MATHEMATICS AND COMPUTINGradiation shielding designShallow Underground Laboratorysuperconducting qubits

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Loer, Ben M., Archambault, Brian C., Fuller, Erin S., Pierson, Bruce D.. 2021-09-01. A Radiation-Shielded, Shallow Underground, Long-Coherence Time Quantum Qubit Concept. https://doi.org/10.2172/1975752

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