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

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arxiv 1111.2890 v1 pith:RU3HKG4V submitted 2011-11-12 cond-mat.mes-hall

Daniel Sank , R. Barends , Radoslaw C. Bialczak , Yu Chen , J. Kelly , M. Lenander , E. Lucero , Matteo Mariantoni
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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
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keywords noisefluxinductorphasequbitcoherencedependencegeometry
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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.

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