Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unambiguous discrimination of coherent states   Coherent states of the quantum electromagnetic field, the quantum description
of ideal laser light, are a prime candidate as information carriers for optical
communications. A large body of literature exists on quantum-limited parameter
estimation and discrimination for coherent states. However, very little is
known about practical realizations of receivers for unambiguous state
discrimination (USD) of coherent states. Here we fill this gap and establish a
theory of unambiguous discrimination of coherent states, with receivers that
are allowed to employ: passive multimode linear optics, phase-space
displacements, un-excited auxiliary input modes, and on-off photon detection.
Our results indicate that these currently-available optical components are near
optimal for unambiguous discrimination of multiple coherent states in a
constellation.

34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th