Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simple variational ground state and pure cat state generation in the
  quantum Rabi model   We introduce a simple, physically-motivated variational ground state for the
quantum Rabi model, and demonstrate that it provides a high-fidelity
approximation of the true ground state in all parameter regimes (including
intermediate and strong coupling regimes). Our variational state is constructed
using Gaussian cavity states and nonorthogonal qubit pointer states, and
contains only three variational parameters. We use our state to develop a
heuristic understanding of how the ground state evolves with increasing
coupling, and find a previously unexplored regime where the ground state
corresponds to the cavity being in a nearly pure Schr\"odinger cat state.

25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat