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| Home > Publications database > Two-stage magnetic shielding for hybrid quantum devices in an adiabatic demagnetization refrigerator |
| Poster (After Call) | FZJ-2025-00490 |
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2024
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Please use a persistent id in citations: doi:10.34734/FZJ-2025-00490
Abstract: Adiabatic demagnetization refrigeration (ADR) is a promising cooling technique for future quantum technology applications. Cooling units for ADRs are cheap and reliable while enabling base temperatures comparable to those obtained in dilution refrigerators. A challenge is the presence residual magnetic fields originating from the magnet used for recharging the paramagnetic salts, as these lower the operation fidelity of superconducting circuits.With the advance of spin qubits and the recent demonstration of long-range coupling by superconducting resonators[1,2], controlling the magnetic environment is crucial. Further, controlling this is beneficial to operate spin qubits at low fields[3] or to implement superconducting-semiconducting hybrid devices in Germanium quantum wells[4,5].Here, we present the design of a 4 Kelvin two-stage mu-metal and Niobium magnetic shield[6] with ports for 4 superconducting RF wires, and 48 DC lines. The lowest temperature stage enters the magnetic shield through a feedthrough and contains an additional Copper radiation shield[7] around the sample space. Using finite element simulations, we quantify the magnetic shielding factor before manufacturing.To benchmark the ADRs shielding performance, we characterize a set of Niobium resonators, measuring their quality factors. First results indicate a competitive performance of these resonators in our customized set-up. To operate spin qubits, we plan on implementing a small superconducting magnet to control the field locally. We aim to achieve a reduced background field, magnetic field noise and avoid field exposure while recharging the salt pill. [1] P. Harvey-Collard et al. Phys. Rev. X 12, 021026[2] F. Borjans et al. Nature 577, 195–198 (2020)[3] D Jirovec et al. Nat. Mater. 20, 1106–1112 (2021)[4] O. Sagi et al. arXiv:2403.16774[5] A. Tosato et al. Commun Mater 4, 23 (2023)[6] A. Bergen et al. Rev Sci Instrum. 2016 Oct;87(10):105109[7] R. Barends et al. Appl. Phys. Lett. 99, 113507 (2011)
Keyword(s): Instrument and Method Development (1st) ; Condensed Matter Physics (2nd)
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