Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of longitudinal coupling for Josephson charge qubits   For inductively coupled superconducting quantum bits, we determine the
conditions when the coupling commutes with the single-qubit terms. We show that
in certain parameter regimes such longitudinal coupling can be stabilized with
respect to variations of the circuit parameters. In addition, we analyze its
stability against fluctuations of the control fields.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom