Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficiencies of Quantum Optical Detectors   We propose a definition for the efficiency that can be universally applied to
all classes of quantum optical detectors. This definition is based on the
maximum amount of optical loss that a physically plausible device can
experience while still replicating the properties of a given detector. We prove
that detector efficiency cannot be increased using linear optical processing.
That is, given a set of detectors, as well as arbitrary linear optical elements
and ancillary light sources, it is impossible to construct detection devices
that would exhibit higher efficiencies than the initial set.

27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex