Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Control of populations of two-level systems by a single resonant laser
  pulse   We present a simple approach allowing to obtain analytical expressions for
laser pulses that can drive a two-level system in an arbitrarily chosen way.
The proposed scheme relates every desired population-evolution path to a single
resonant laser pulse. It allows to drive the system from any initial
superposition of the two states to a final state having the desired
distribution of the populations. We exemplify the scheme with a concrete
example, where the system is driven from a non-stationary superposition of
states to one of its eigenstates. We argue that the proposed approach may have
interesting applications for designing pulses that can control ultrafast
charge-migration processes in molecules. Although focused on laser driven
population control, the results obtained are general and could be applied for
designing other types of control fields.

14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga