Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analytical solutions and genuine multipartite entanglement of the
  three-qubit Dicke model   We present analytical solutions to three qubits and a single-mode cavity
coupling system beyond the rotating-wave approximation (RWA). The zero-th order
approximation gives correct solutions when the qubits are far detuned from the
cavity. The first order approximation, called generalized rotating-wave
approximation (GRWA), produces an effective solvable Hamiltonian with the same
form as the ordinary RWA one and exhibits substantial improvements of energy
levels over the RWA even on resonance. Based on these analytical
eigen-solutions, we study both the bipartite entanglement and genuine
multipartite entanglement (GME). The dynamics of the concurrence and the GME
using the GRWA are in consistent with the numerical ones. Interestingly, the
well known sudden death of entanglement occurs in the bipartite entanglement
dynamics but not in GME dynamics.

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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
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The categories of this paper are: supr-con
16
The categories of this paper are: stat
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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
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The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas