Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exploration of photon-number entangled states using weak nonlinearities   A method for exploring photon-number entangled states with weak
nonlinearities is described. We show that it is possible to create and detect
such entanglement at various scales, ranging from microscopic to macroscopic
systems. In the present architecture, we suggest that the maximal phase shift
induced in the process of interaction between photons is proportional to photon
numbers. Also, in the absence of decoherence we analyze maximum error
probability and show its feasibility with current technology.

12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph