Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon subtraction from traveling fields - recent experimental
  demonstrations   We review our most recent results on application of the photon subtraction
technique for optical quantum information processing primitives, in particular
entanglement distillation and generation of squeezed qubit states. As an
introduction we provide a brief summary of other experimental accomplishments
in the field.

23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex