Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of Bright Two-Color Continuous Variable Entanglement   We present the first measurement of squeezed-state entanglement between the
twin beams produced in an Optical Parametric Oscillator (OPO) operating above
threshold. Besides the usual squeezing in the intensity difference between the
twin beams, we have measured squeezing in the sum of phase quadratures. Our
scheme enables us to measure such phase anti-correlations between fields of
different frequencies. In the present measurements, wavelengths differ by ~1
nm. Entanglement is demonstrated according to the Duan et al. criterion [Phys.
Rev. Lett. 84, 2722 (2000)] $\Delta^2\hat{p}_- +\Delta^2\hat{q}_+=1.47(2)<2$.
This experiment opens the way for new potential applications such as the
transfer of quantum information between different parts of the electromagnetic
spectrum.

17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom