Hybrid quantum systems with high‑Tc superconducting resonators
Résumé
Superconducting microwave resonators are crucial elements of microwave circuits, offering a wide range of potential applications in modern science and technology. While conventional low‑ Tc superconductors are mainly employed, high‑Tc cuprates could offer enhanced temperature and magnetic field operating ranges. Here, we report the realization of YBa2Cu3O7−δ superconducting coplanar waveguide resonators, and demonstrate a continuous evolution from a lossy undercoupled regime, to a lossless overcoupled regime by adjusting the device geometry, in good agreement with circuit model theory. A high‑quality factor resonator was then used to perform electron spin resonance measurements on a molecular spin ensemble across a temperature range spanning two decades. We observe spin‑cavity hybridization indicating coherent coupling between the microwave field and the spins in a highly cooperative regime. The temperature dependence of the Rabi splitting and the spin relaxation time point toward an antiferromagnetic coupling of the spins below 2 K. Our findings indicate that high‑Tc superconducting resonators hold great promise for the development of functional circuits. Additionally, they suggest novel approaches for achieving hybrid quantum systems based on high‑Tc superconductors and for conducting electron spin resonance measurements over a wide range of magnetic fields and temperatures.
Domaines
Physique [physics]| Origine | Publication financée par une institution |
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