Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-03-22
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures (processed a few minor corrections)
Scientific paper
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.
Denega S. Z.
der Wal Caspar H. van
Jansen T. L. C.
Reuter Dennis
Sladkov Maksym
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