Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entangled microwave photons from quantum dots   We describe a mechanism for the production of polarisation-entangled
microwaves using intra-band transitions in a pair of quantum dots. This
proposal relies neither on spin-orbit coupling nor on control over
electron-electron interactions. The quantum correlation of microwave
polarisations is obtained from orbital degrees of freedom in an external
magnetic field. We calculate the concurrence of emitted microwave photon pairs,
and show that a maximally entangled Bell pair is obtained in the limit of weak
inter-dot coupling.

1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio