Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On-demand Entanglement Source with Polarization-Dependent Frequency
  Shift   We propose a polarization-dependent spatial phase modulation method to purify
the two-photon polarization entanglement generated by the biexciton cascade
decay in a single semiconductor quantum dot. In principle, our method can
completely compensate the random phase acquired from the decay of the
non-degenerate exciton states in time domain. In frequency domain, our method
is equivalent to shifting photon frequency according to its polarization. The
method can be applied immediately by existing experimental set-ups.

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The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas