Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A two-state Raman coupler for coherent atom optics   We present results on a Raman laser-system that resonantly drives a closed
two-photon transition between two levels in different hyperfine ground states
of 87Rb. The coupler is based on a novel optical design for producing two
phase-coherent optical beams to drive a Raman transition. Operated as an
outcoupler, it produces an atom laser in a single internal atomic state, with
the lower divergence and increased brightness typical of a Raman outcoupler.
Due to the optical nature of the outcoupling, the two-state outcoupler is an
ideal candidate for transferring photon correlations onto atom-laser beams. As
our laser system couples just two hyperfine ground states, it has also been
used as an internal state beamsplitter, taking the next major step towards free
space Ramsey interferometry with an atom laser.

22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys