用于超导电路的三元金属氧化物衬底
Ternary Metal Oxide Substrates for Superconducting Circuits
摘要：
衬底材料缺陷和表面损耗是限制超导量子电路达到构建实用量子计算机所需的规模和复杂性的主要因素之一。实现超导量子器件更高相干性的一个潜在途径是探索新的衬底材料，该材料由于固有的不同表面化学性质而具有降低的缺陷密度。在这里，我们研究两个三元金属氧化物材料，尖晶石（MgAl2O4）和铝酸镧（LaAlO3），重点是表面和界面的表征和制备。在LaAlO3上制造的器件具有比早期器件高三倍的品质因数，这归因于界面无序的减少。MgAl2O4是超导量子器件领域的一种新材料，即使在存在显著表面无序的情况下，也始终优于LaAlO3。我们的研究结果强调了材料探索，衬底制备和表征的重要性，以确定适合高性能超导量子电路的材料。
英文摘要：
Substrate material imperfections and surface losses are one of the major factors limiting superconducting quantum circuitry from reaching the scale and complexity required to build a practicable quantum computer. One potential path towards higher coherence of superconducting quantum devices is to explore new substrate materials with a reduced density of imperfections due to inherently different surface chemistries. Here, we examine two ternary metal oxide materials, spinel (MgAl2O4) and lanthanum aluminate (LaAlO3), with a focus on surface and interface characterization and preparation. Devices fabricated on LaAlO3 have quality factors three times higher than earlier devices, which we attribute to a reduction in interfacial disorder. MgAl2O4 is a new material in the realm of superconducting quantum devices and, even in the presence of significant surface disorder, consistently outperforms LaAlO3. Our results highlight the importance of materials exploration, substrate preparation, and characterization to identify materials suitable for high-performance superconducting quantum circuitry.
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