Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Programmable purification of type-I polarization-entanglement   We suggest and demonstrate a scheme to compensate spatial and spectral
decoherence effects in the generation of polarization entangled states by
type-I parametric downconversion. In our device a programmable spatial light
modulator imposes a polarization dependent phase-shift on different spatial
sections of the overall downconversion output and this effect is exploited to
realize an effective purification technique for polarization entanglement.

12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph