Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Third quantization of the electromagnetic field   We consider an approach in which the usual wave function in the quadrature
representation of mode j of the electromagnetic field is further quantized to
produce a field operator. Since the electromagnetic field is already second
quantized, this corresponds to an additional or third quantization. The
third-quantization approach can be used to perform certain quantum optics
calculations in the Heisenberg picture that could only be performed in the
Schrodinger picture when using the conventional second-quantized theory. This
approach also allows an interesting generalization of quantum optics and
quantum electrodynamics that is analogous to symmetry breaking in elementary
particle theory. The predictions of the generalized theory could be tested
using a proposed photon scattering experiment.

8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex