Dually tunable YBCO coplanar waveguide resonators based on helium-ion-generated Josephson inductances
- URL: http://arxiv.org/abs/2605.30425v1
- Date: Thu, 28 May 2026 18:00:05 GMT
- Title: Dually tunable YBCO coplanar waveguide resonators based on helium-ion-generated Josephson inductances
- Abstract summary: Superconducting microwave circuits with and without Josephson inductances are the Swiss Army knife for many experiments and technologies from quantum information science to astrophysical particle detectors.<n>Despite a large variety of existing circuit types, thin film materials and Josephson junction technologies, a flexible and reliable platform for high-magnetic-field and high-temperature applications is yet to be found.<n>In this manuscript, we investigate coplanar waveguide cavities made of the high-temperature cuprate superconductor YBa$$Cu$_3$O$_7$ (YBCO)<n>We obtain strongly flux-tunable microwave resonators
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Superconducting microwave circuits with and without Josephson inductances are the Swiss Army knife for many experiments and technologies from quantum information science to astrophysical particle detectors. Despite a large variety of existing circuit types, thin film materials and Josephson junction technologies, a flexible and reliable platform for high-magnetic-field and high-temperature applications is yet to be found. In this manuscript, we investigate coplanar waveguide cavities made of the high-temperature cuprate superconductor YBa$_2$Cu$_3$O$_7$ (YBCO), integrated with Josephson inductances and quantum interferometers that are generated by the controlled local irradiation of the YBCO with a focused helium ion beam. We obtain strongly flux-tunable microwave resonators, which not only display periodic interferometer oscillations of resonance frequency and decay rate, but also a superimposed Fraunhofer-like modulation pattern. The latter originates from the magnetic field tuning of the individual Josephson junction critical currents due to the out-of-plane junction barriers. It allows adjusting resonance frequency and flux responsivity independently of each other, potentially enabling tunable microwave circuits with low sensitivity to external magnetic-field noise over a broad range of frequencies. Finally, we investigate the temperature dependence of the cavities, show that they have promising characteristics up to 14$\,$K, and present a model for the junction-induced cavity losses.
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