Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fast Amplification and Rephasing of Entangled Cat States in a
  Qubit-Oscillator System   We study a qubit-oscillator system, with a time-dependent coupling
coefficient, and present a scheme for generating entangled Schr\"odinger-cat
states with large mean photon numbers and also a scheme that protects the cat
states against dephasing caused by the nonlinearity in the system. We focus on
the case where the qubit frequency is small compared to the oscillator
frequency. We first present the exact quantum state evolution in the limit of
infinitesimal qubit frequency. We then analyze the first-order effect of the
nonzero qubit frequency. Our scheme works for a wide range of coupling strength
values, including the recently achieved deep-strong-coupling regime.

22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an