arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.3904cond-mat.supr-con
收藏

金属-绝缘体界面处金属感生隙态的局域化:SQUID和超导量子比特中磁通噪声的起源

Localization of Metal-Induced Gap States at the Metal-Insulator Interface:Origin of Flux Noise in SQUIDs and Superconducting Qubits

SangKook Choi, Dung-Hai Lee, Steven G. Louie, John Clarke

摘要:

功率谱标度为$1/f$($f$是频率)的超导量子干涉器件中磁通量噪声的起源一直是一个谜超过20年。这种噪声限制了超导量子比特的退相干时间。一个共识已经出现,噪声来自于局部电子的面密度为$5\times10^{17}$ m $^{-2}$的自旋波动。我们表明,在金属-绝缘体界面的潜在的障碍的存在下,一些金属诱导的间隙状态成为本地化,并产生本地的时刻。适度的无序程度产生所观察到的面密度。

英文摘要:

The origin of magnetic flux noise in Superconducting Quantum Interference Devices with a power spectrum scaling as $1/f$ ($f$ is frequency) has been a puzzle for over 20 years. This noise limits the decoherence time of superconducting qubits. A consensus has emerged that the noise arises from fluctuating spins of localized electrons with an areal density of $5\times10^{17}$m$^{-2}$. We show that, in the presence of potential disorder at the metal-insulator interface, some of the metal-induced gap states become localized and produce local moments. A modest level of disorder yields the observed areal density.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑