Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of X-state in anisotropic Heisenberg spin with magnetic field   We study the dynamics of X-state for anisotropic Heisenberg spin system using
quantum fidelity. It is shown that while Bell diagonal state, a special class
of X-state, is stationary, there exists a set of two parametric states which
are stationary in presence of external uniform magnetic field.

27
The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an