Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extra phase noise from thermal fluctuations in nonlinear optical
  crystals   We show theoretically and experimentally that scattered light by thermal
phonons inside a second-order nonlinear crystal is the source of additional
phase noise observed in Optical Parametric Oscillators. This additional phase
noise reduces the quantum correlations and has hitherto hindered the direct
production of multipartite entanglement in a single nonlinear optical system.
We cooled the nonlinear crystal and observed a reduction of the extra noise.
Our treatment of this noise can be successfully applied to different systems in
the literature.

26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph