Velluire-Pellat Z, Maréchal E, Moulonguet N, Saïz G, Ménard G C, Kozlov S, Couëdo F, Amari P, Medous C, Paris J, Hostein R, Lesueur J, Feuillet-Palma C, Bergeal N
Laboratoire de Physique et d'Étude des Matériaux, ESPCI Paris, Université PSL, CNRS, Sorbonne Université, Paris, France.
Laboratoire National de Métrologie et d'Essais (LNE), 29 Avenue Roger Hennequin, 78197 Trappes, France.
Sci Rep. 2023 Sep 1;13(1):14366. doi: 10.1038/s41598-023-41472-z.
Superconducting microwave resonators are crucial elements of microwave circuits, offering a wide range of potential applications in modern science and technology. While conventional low-T[Formula: see text] superconductors are mainly employed, high-T[Formula: see text] cuprates could offer enhanced temperature and magnetic field operating ranges. Here, we report the realization of [Formula: see text] 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-T[Formula: see text] superconductors and for conducting electron spin resonance measurements over a wide range of magnetic fields and temperatures.
超导微波谐振器是微波电路的关键元件，在现代科学技术中具有广泛的潜在应用。虽然主要使用传统的低温超导体，但高温铜酸盐可能具有更高的温度和磁场工作范围。在此，我们报告了[公式：见正文]超导共面波导谐振器的实现，并通过调整器件几何结构，展示了从有损欠耦合状态到无损过耦合状态的连续演变，这与电路模型理论高度吻合。然后，使用一个高品质因数的谐振器在跨越二十年的温度范围内对分子自旋系综进行电子自旋共振测量。我们观察到自旋 - 腔杂交，表明在高度协同的状态下微波场与自旋之间存在相干耦合。拉比分裂和自旋弛豫时间的温度依赖性表明在2 K以下自旋存在反铁磁耦合。我们的研究结果表明，高温超导谐振器在功能电路的发展方面具有巨大潜力。此外，它们还为基于高温超导体实现混合量子系统以及在广泛的磁场和温度范围内进行电子自旋共振测量提供了新方法。
