Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrafast mapping of optical polarization states onto spin coherence of
  localized electrons in a semiconductor   We experimentally demonstrate an ultrafast method for preparing spin states
of donor-bound electrons in GaAs with single laser pulses. Each polarization
state of a preparation pulse has a direct mapping onto a spin state, with
bijective correspondence between the Poincar\'{e}-sphere (for photon
polarization) and Bloch-sphere (for spin) state representations. The
preparation is governed by a stimulated Raman process and occurs orders of
magnitude faster than the spontaneous emission and spin dephasing. Similar
dynamics governs our ultrafast optical Kerr detection of the spin coherence,
thus getting access to spin state tomography. Experiments with double
preparation pulses show an additive character for the preparation method.
Utilization of these phenomena is of value for quantum information schemes.

10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th