Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Schemes for generating W state of paths and W state of polarization
  photons   In this paper, we give two very simple schemes to produce two kinds of W
states, one kind is path W state with one photon and the other is multiphoton
photon polarization W state. These schemes just need a common commercial
multiport fiber coupler and single photon sources, they are feasible by current
technologies.

17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg