Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of many-particle entanglement in an ion trap by adiabatic
  ground-state transitions   We discuss the creation of many-particle entanglement in an ion trap where
all ions are simultaneously coupled to bichromatic laser fields. It is shown
that in a time-averaged, coarse-grained picture the system can be mapped onto a
spin ensemble with controllable collective interactions. An adiabatic change of
laser parameters allows a transfer from separable to entangled eigenstates of
the many-particle Hamiltonian. Of particular interest is a transition in the
ground state which in some cases corresponds to a quantum phase transition. The
influence of decoherence mechanisms can be substantially reduced if at all
times a sufficiently large energy gap between the ground state and the first
excited state is maintained.

2
The categories of this paper are: math
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics