Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-linear two-photon resonance fluorescence on a single artificial atom   We report two-photon resonance fluorescence of an individual semiconductor
artificial atom. By non-linearly driving a single quantum dot via a two-photon
transition, we probe the linewidth of the two-photon processes and show that,
similar to their single-photon counterparts, they are close to being Fourier
limited at low temperatures. The evolution of the population of excitonic
states with the Rabi frequency exhibits a clear s-shaped behavior, indicative
of the non-linear response via the two-photon excitation process. We model the
non-linear response using a 4-level atomic system representing the manifold of
excitonic and biexcitonic states of the quantum dot and show that quantitative
agreement is obtained only by including the interaction with LA-phonons in the
solid state environment. Finally, we demonstrate the formation of dressed
states emerging from a two-photon interaction between the artificial atom and
the excitation field. The non-linear optical dressing induces a mixing of all
four excitonic states that facilitates the tuning of the polarization selection
rules of the artificial atom.

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The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg