Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surface spin fluctuations probed with flux noise and coherence in
  Josephson phase qubits   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.

22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th