Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deterministic polarization-entanglement purification using spatial
  entanglement   We present an efficient entanglement purification protocol with
hyperentanglement in which additional spatial entanglement is utilized to
purify the two-particle polarization-entangled state. The bit-flip error and
phase-flip error can be corrected and eliminated in one step. Two remote
parties can obtainmaximally entangled polarization states deterministically and
only passive linear optics are employed. We also discuss the protocol with
practical quantum source and noisy channel.

23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an