Flux noise probed with real time qubit tomography in a Josephson phase qubit.
Flux noise probed with real time qubit tomography in a Josephson phase qubit.
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DOI：
10.1103/physrevlett.109.067001
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发表时间：
2012-08
影响因子：
8.6
通讯作者：
D. Sank;R. Barends;R. Bialczak;Yu Chen;J. Kelly;M. Lenander;E. Lucero;M. Mariantoni;A. Megrant;M. Neeley;M. Neeley;P. O’Malley;A. Vainsencher;Haohua Wang;Haohua Wang;J. Wenner;T. White;Tsuyoshi Yamamoto;Yi Yin;A. Cleland;J. Martinis
中科院分区：
文献类型：
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作者：
D. Sank;R. Barends;R. Bialczak;Yu Chen;J. Kelly;M. Lenander;E. Lucero;M. Mariantoni;A. Megrant;M. Neeley;M. Neeley;P. O’Malley;A. Vainsencher;Haohua Wang;Haohua Wang;J. Wenner;T. White;Tsuyoshi Yamamoto;Yi Yin;A. Cleland;J. Martinis
我们测量了量子位相相干性和磁通噪声对电感线圈几何形状的依赖性。更宽的电感走线既不会改变磁通噪声功率谱，也不会改变量子比特去相时间，但电感的增加会导致两者同时增加。利用我们新的层析成像协议测量低频磁通噪声，我们直接比较了磁通噪声频谱和量子比特相位衰减，发现在理论的10%以内一致。
We measure the dependence of qubit phase coherence and 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 new tomographic 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.