Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: State Estimation Of a Quantum Cavity Driven by single-photon   The cavity is a fundamental ingredient of quantum optical systems. This paper
concerns the behavior of a quantum cavity driven by non-classical field in
single-photon state. To this end, the number operator has been opted to reveal
the number of photons inside the cavity. Then, the quantum filtering equations
have been employed to derive a stochastic master equation for the cavity which
is driven by single-photon and is observed by either Homodyne or
photon-counting detector. Finally, the state of the cavity has been estimated
by the derived equations, and the results have been compared with the
conventional master equation.

31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph