Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement dynamics of a superconducting phase qubit coupled to a
  two-level system   We report the observation and quantitative characterization of driven and
spontaneous oscillations of quantum entanglement, as measured by concurrence,
in a bipartite system consisting of a macroscopic Josephson phase qubit coupled
to a microscopic two-level system. The data clearly show the behavior of
entanglement dynamics such as sudden death and revival, and the effect of
decoherence and ac driving on entanglement.

16
The categories of this paper are: stat
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph