Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of the photocount statistics for multi-mode multi-frequency
  radiation fields   We derive on the level of quantum optics expressions for the uncertainty of
the photocount in a multi-mode multi-frequency setup. The result depends on the
quantum correlations of the individual modes and the frequency spectrum of the
radiation, the latter leading to a frequency beating sometimes referred to as
dynamic laser speckle. When the mode structure of the radiation field is
disturbed between source and detector, another contribution to the photocount
uncertainty referred to as static speckle appears. To predict the size of this
effect, we present a suitable definition of the etendue (or phase space volume)
that links the number of modes of a radiation field to macroscopic quantities.

30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat