arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.2890cond-mat.mes-hall
收藏

约瑟夫森相位量子比特中磁通噪声和相干性探测的表面自旋涨落

Surface spin fluctuations probed with flux noise and coherence in Josephson phase qubits

Daniel Sank, R. Barends, Radoslaw C. Bialczak, Yu Chen, J. Kelly, M. Lenander, E. Lucero, Matteo Mariantoni, M. Neeley, P. J. J. O'Malley, A. Vaisencher, H. Wan… 展开作者

Daniel Sank, R. Barends, Radoslaw C. Bialczak, Yu Chen, J. Kelly, M. Lenander, E. Lucero, Matteo Mariantoni, M. Neeley, P. J. J. O'Malley, A. Vaisencher, H. Wang, J. Wenner, T. C. White, T. Yamamoto, Yi Yin, A. N. Cleland, John M. Martinis

摘要:

我们测量了量子比特相位相干性和表面自旋诱导的磁通噪声对电感环几何形状的依赖性。虽然更宽的电感器迹线既不改变通量噪声功率谱也不改变量子位失相时间,但增加的电感导致两者同时增加。使用我们的协议来测量低频通量噪声,我们直接比较了通量噪声谱和量子比特相位衰减,发现理论上的一致性在10%以内。测量的磁通噪声电感器的几何形状的依赖关系是一致的噪声源的相关长度在6和400微米之间。

英文摘要:

We measure the dependence of qubit phase coherence and surface spin induced flux noise on inductor loop geometry. While wider inductor traces change neither the flux noise power spectrum nor the qubit dephasing time, increased inductance leads to a simultaneous increase in both. Using our protocol for measuring low frequency flux noise, we make a direct comparison between the flux noise spectrum and qubit phase decay, finding agreement within 10% of theory. The dependence of the measured flux noise on inductor geometry is consistent with a noise source correlation length between 6 and 400 um.

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。

↑