Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Disentanglement of two qubits coupled to an XY spin chain: Role of
  quantum phase transition   We study the disentanglement of two spin qubits which interact with a general
XY spin-chain environment. The dynamical process of the disentanglement is
numerically and analytically investigated in the vicinity of quantum phase
transition (QPT) of the spin chain in both weak and strong coupling cases. We
find that the disentanglement of the two qubits is in general enhanced greatly
when the environmental spin chain is exposed to QPT. We give a detailed
analysis to facilitate the understanding of the QPT-enhanced decaying behavior
of the disentanglement factor. Furthermore, the scaling behavior in the
disentanglement dynamics is also revealed and analyzed.

20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas