Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient W state entanglement concentration using quantum-dot and
  optical microcavities   We present an entanglement concentration protocols (ECPs) for less-entangled
W state with quantum-dot and microcavity coupled system. The present protocol
uses the quantum nondemolition measurement on the spin parity to construct the
parity check gate. Different from other ECPs, this less-entangled W state with
quantum-dot and microcavity coupled system can be concentrated with the help of
some single photons. The whole protocol can be repeated to get a higher success
probability. It may be useful in current quantum information processing.

14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat