Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-orthogonal qubit states expansion for the asymmetric quantum Rabi
  model   We present a physically motivated variational wave function for the ground
state of the asymmetric quantum Rabi model (AQRM). The wave function is a
weighted superposition of squeezed coherent states entangled with
non-orthogonal qubit states, and relies only on three variational parameters in
the regimes of interest where the squeezing effect becomes negligible. The
variational expansion describes the ground state remarkably well in almost all
parameter regimes, especially with arbitrary bias. We use the variational
result to calculate various relevant physical observables of the ground state,
and make a comparison with existing approximations and the exact solution. The
results show that the variational expansion is a significant improvement over
the existing approximations for the AQRM.

11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys