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Vacancy dynamics in niobium and its native oxides and their potential implications for quantum computing and superconducting accelerators
Physical Review B ( IF 3.7 ) Pub Date : 2022-09-27 , DOI: 10.1103/physrevb.106.094516
Marc Wenskat, Jakub Čižek, Maciej Oskar Liedke, Maik Butterling, Martin Stiehl, Guilherme Dalla Lana Semione, Constanze Backes, Christopher Bate, Oksana Melikhova, Eric Hirschmann, Andreas Wagner, Hans Weise, Andreas Stierle, Martin Aeschlimann, Wolfgang Hillert

In recent years, superconducting radio-frequency (SRF) cavities have been considered as candidates for qubits in quantum computing, showing longer photon lifetimes and, therefore, longer decoherence times of a cavity stored qubit compared to many other realizations. In modern particle accelerators, SRF cavities are the workhorse. Continuous research and development efforts are being undertaken to improve their properties, i.e., to increase the accelerating field and lower the surface resistance, which in turn increase the energy reach and duty cycle of accelerators. While some experimental milestones have been achieved, the mechanisms behind the still observed losses remain not fully understood. In this contribution we are going to show that a recently reported temperature treatment of Nb SRF cavities in the temperature range of 573–673 K, which reduces the residual surface resistance to unprecedented values, is linked to a reorganization of the niobium oxide and near-surface vacancy structure and that this reorganization can explain the observed improved performance in both applications, quantum computing and SRF cavities.

中文翻译:

铌及其天然氧化物的空位动力学及其对量子计算和超导加速器的潜在影响

近年来,超导射频(SRF)腔被认为是量子计算中量子比特的候选者,与许多其他实现相比,显示出更长的光子寿命,因此,腔存储的量子比特的退相干时间更长。在现代粒子加速器中,SRF 腔是主力。正在进行持续的研究和开发工作以改善其性能,即增加加速场并降低表面电阻,这反过来又增加了加速器的能量范围和占空比。虽然已经实现了一些实验里程碑,但仍然观察到的损失背后的机制仍未完全了解。在这篇文章中,我们将展示最近报道的 Nb SRF 腔在 573-673 K 温度范围内的温度处理,
更新日期:2022-09-28
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