Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-level cascaded electromagnetically induced transparency in cold
  atoms using an optical nanofibre interface   Ultrathin optical fibres integrated into cold atom setups are proving to be
ideal building blocks for atom-photon hybrid quantum networks. Such optical
nanofibres (ONF) can be used for the demonstration of nonlinear optics and
quantum interference phenomena in atomic media. Here, we report on the
observation of multilevel cascaded electromagnetically induced transparency
(EIT) using an optical nanofibre to interface cold $^{87}$Rb atoms through the
intense evanescent fields that can be achieved at ultralow probe and coupling
powers. Both the probe (at 780 nm) and the coupling (at 776 nm) beams propagate
through the nanofibre. The observed multipeak transparency spectra of the probe
beam could offer a method for simultaneously slowing down multiple wavelengths
in an optical nanofibre or for generating ONF-guided entangled beams, showing
the potential of such an atom-nanofibre system for quantum information. We also
demonstrate all-optical-switching in the all fibred system using the obtained
EIT effect.

37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys