Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absorption Spectrum of a Two-Level System Subjected to a Periodic Pulse
  Sequence   We investigate how the quantum control of a two-level system (TLS) coupled to
photons can modify and tune the TLS's photon absorption spectrum. Tuning and
controlling the emission and the absorption is of much interest e.g.\ for the
development of efficient interfaces between stationary and flying qubits in
modern architectures for quantum computation and quantum communication. We
consider the periodic pulse control, where the TLS is subjected to a periodic
sequence of the near-resonant Rabi driving pulses, each pulse implementing a
180$^\circ$ rotation. For small inter-pulse delays, the absorption spectrum
features a pronounced peak of stimulated emission at the pulse frequency, as
well as equidistant satellite peaks with smaller spectral weights. As long as
the detuning between the carrier frequency of the driving and the TLS
transition frequency remains moderate, this spectral shape shows little change.
Therefore, the quantum control allows shifting the absorption peak to a desired
position, and locks the absorption peak to the carrier frequency of the driving
pulses. Detailed description of the spectrum, and its evolution as a function
time, the inter-pulse spacing and the detuning, is presented.

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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an