Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement of image resolution beyond the diffraction-limit by
  interacting dark resonances   We show how quantum coherence effects can be used to improve the resolution
and the contrast of diffraction-limited images imprinted onto a probe field.
The narrow and sharp spectral features generated by double-dark resonances
(DDR) are exploited to control absorption, dispersion and diffraction
properties of the medium. The spatial modulated control field can produce
inhomoge- neous susceptibility of the medium that encodes the spatial feature
of the control image to probe field in the presence of DDR. The transmission of
cloned image can be enhanced by use of incoher- ent pump field. We find that
the feature size of cloned image is four times smaller than the initial
characteristic size of the control image even though the control image is
completely distorted after propagation through 3 cm long Rb vapour cell. We
further discuss how spatial optical switching is possible by using of induced
transparency and absorption of the medium.

23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn