Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum entanglement in trimer spin-1/2 Heisenberg chains with
  antiferromagnetic coupling   The quantum entanglement measure is determined, for the first time, for
antiferromagnetic trimer spin-1/2 Heisenberg chains. The physical quantity
proposed to measure the entanglement is the distance between states by adopting
the Hilbert-Schmidt norm. The method is applied to the new magnetic Cu(II)
trimer system, 2b.3CuCl_2.2H_2O, and to the trinuclear Cu(II) halide salt,
(3MAP)_2Cu_2Cl_8. The decoherence temperature, above which the entanglement is
suppressed, is determined for the both systems. A correlation among their
decoherence temperatures and their respective exchange coupling constants is
established.

31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess