Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement Classification of Restricted Greenberger-Horne-Zeilinger
  Symmetric States in Four-Qubit System   Similar to the three-qubit Greenberger-Horne-Zeilinger (GHZ) symmetry we
explore the four-qubit GHZ symmetry group and its subgroup called restricted
GHZ symmetry group. While the set of symmetric states under the whole group
transformation is represented by three real parameters, the set of symmetric
states under the subgroup transformation is represented by two real parameters.
After comparing the symmetric states for whole and subgroup, the entanglement
is examined for the latter set. It is shown that the set has only two SLOCC
classes, $L_{abc_2}$ and $G_{abcd}$. Extension to the multi-qubit system is
briefly discussed.

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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph