Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Violation Of Bell-like Inequalities By Electronic Shot
  Noise   Quantum electronic noise, the random current fluctuations generated by
electrons crossing a quantum conductor, has been thoroughly studied from the
electron point of view. Recent experiments have shown that such noise may have
striking properties in terms of the quantum electromagnetic field it generates.
Both the existence of vacuum squeezing \cite{PAN_squeezing} and generation of
correlated photon pairs \cite{C4quantique} have been observed. Here we
demonstrate that this electromagnetic field also violates Bell-like
inequalities, thereby proving its true quantum nature. This is achieved by the
observation of two-mode quadrature squeezing of vacuum: the electromagnetic
field quadratures at two different frequencies can be so correlated that their
difference goes below vacuum fluctuations. Thus, electronic noise contains
entangled photon pairs, a key ingredient for quantum computing and
communication.

14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn