Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modulating quantum Fisher information of qubit in dissipative cavity by
  coupling strength   By using the non-Markovian master equation, we investigate the effect of the
cavity and the environment on the quantum Fisher information (QFI) of an atom
qubit system in a dissipation cavity. We obtain the formulae of QFI for two
different initial states and analyze the effect of the atom-cavity coupling and
the cavity-reservoir coupling on the QFI. The results show that the dynamic
behavior of the QFI is obviously dependent on the initial atomic states, the
atom-cavity coupling and the cavity-reservoir coupling. The stronger the
atom-cavity coupling, the quicker the QFI oscillates and the slower the QFI
reduces. Especially, the QFI will tend to a stable value not zero if the
atom-cavity coupling is large enough. On the other hand, the smaller the
cavity-reservoir coupling, the stronger the non-Markovian effect, the slower
the QFI decay. In other words, choosing the best parameter can improve the
accuracy of parameter estimation. In addition, the physical explanation of the
dynamic behavior of the QFI is given by means of the QFI flow.

8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics