Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient entanglement concentration for three-photon W states with
  parity check measurement   We present an optimal entanglement concentration ECP for an arbitrary
less-entangled W state. By two of the parties say Alice and Charlie performing
one parity check measurements, they can obtain the maximally entangled W state
with a certain probability. Otherwise, they can obtain another lesser-entangled
W state with another probability, which can be used to reconcentrated into a
maximally entangled W state. By iterating this ECP several times, it has the
maximal success probability. This ECP maybe an optimal one and is useful in
current quantum information processing.

4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga