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Epoxy IR Filters for Superconducting Resonators

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Abstract

Infrared radiation leakage through dielectrics in coaxial cabling can create unwanted quasiparticles in superconducting resonators if allowed to reach devices unattenuated. Modern experimental setups commonly incorporate epoxy-based filter blocks on readout and control lines in order to mitigate this effect; however, most of these multi-channel designs require specialized mounting hardware. This investigation details the design and construction of single-channel inline infrared filters, and finds that their installation in the readout system for an aluminum resonator increased its quality factor by an average of 12% across a range of operating temperatures and powers. The option to incorporate general-purpose inline filters instead of designing custom filter blocks and mounts should prove more convenient for many newer experiments.

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Availability of Data and Material

The datasets generated during and analysed during the current study are available from the corresponding author on request.

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Authors and Affiliations

  1. Department of Physics, University of Minnesota Twin Cities, Minneapolis, MN, 55455, USA

    G. Spahn

  2. Fermi National Accelerator Laboratory, Center for Particle Astrophysics, Batavia, IL, USA

    N. Kurinsky, S. Lewis, D. Bowring & M. Hollister

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  1. G. Spahn
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  2. N. Kurinsky
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  3. S. Lewis
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  4. D. Bowring
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  5. M. Hollister
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Correspondence to G. Spahn.

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Spahn, G., Kurinsky, N., Lewis, S. et al. Epoxy IR Filters for Superconducting Resonators. J Low Temp Phys 209, 1032–1037 (2022). https://doi.org/10.1007/s10909-022-02778-w

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  • DOI: https://doi.org/10.1007/s10909-022-02778-w

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