Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Demonstration of a programmable source of two-photon multiqubit
  entangled states   We suggest and demonstrate a novel source of two-photon multipartite
entangled states which exploits the transverse spatial structure of spontaneous
parametric downconversion together with a programmable spatial light modulator
(SLM). The 1D SLM is used to perform polarization entanglement purification and
to realize arbitrary phase-gates between polarization and momentum degrees of
freedom of photons. We experimentally demonstrate our scheme by generating
two-photon three qubit linear cluster states with high fidelity using a diode
laser pump with a limited coherence time and power on the crystal as low as
2.5$mW.

35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci