Hydrogen crystals reduce dissipation in superconducting resonators

• URL: http://arxiv.org/abs/2306.04112v2
• Date: Sat, 6 Apr 2024 02:47:57 GMT
• Title: Hydrogen crystals reduce dissipation in superconducting resonators
• Authors: Francesco Valenti, Andrew N. Kanagin, Andreas Angerer, Luiza Buimaga-Iarinca, Cristian Morari, Jörg Schmiedmayer, Ioan M. Pop,
• Abstract summary: Internal quality factors of superconducting resonators made of granular aluminum can be improved by coating them with micrometric films of para-hydrogen molecular crystals. We attribute the average measured dissipation to absorption of stray terahertz radiation at the crystal-resonator interface. The hydrogen crystal does not introduce additional losses, which is promising for embedding impurities to couple to superconducting thin-film devices in hybrid quantum architectures.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We show that the internal quality factors of high impedance superconducting resonators made of granular aluminum can be improved by coating them with micrometric films of solid para-hydrogen molecular crystals. We attribute the average measured $\approx 8\%$ reduction in dissipation to absorption of stray terahertz radiation at the crystal-resonator interface and the subsequent dissipation of its energy in the form of phonons below the pair-breaking gap. Our results prove that, contrary to expectations, replacing the vacuum dielectric atop a superconducting resonator can be beneficial, thanks to the added protection against Cooper pair-braking terahertz radiation. Moreover, at the level of internal quality factors in the $10^5$ range, the hydrogen crystal does not introduce additional losses, which is promising for embedding impurities to couple to superconducting thin-film devices in hybrid quantum architectures.

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