Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dressed excitonic states and quantum interference in a three-level
  quantum dot ladder system   We observe dressed states and quantum interference effects in a strongly
driven three-level quantum dot ladder system. The effect of a strong coupling
field on one dipole transition is measured by a weak probe field on the second
dipole transition using differential reflection. When the coupling energy is
much larger than both the homoge-neous and inhomogeneous linewidths an
Autler-Townes splitting is observed. Striking differences are observed when the
transitions resonant with the strong and weak fields are swapped, particularly
when the coupling energy is nearly equal to the measured linewidth. This result
is attributed to quantum interference: a modest destructive or constructive
interference is observed depending on the pump / probe geometry. The data
demonstrate that coher-ence of both the bi-exciton and the exciton is
maintained in this solid-state system, even under intense illumina-tion, which
is crucial for prospects in quantum information processing and non-linear
optical devices.

27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex