Decoherence processes during active manipulation of excitonic qubits in semiconductor quantum dots

Details Decoherence processes during active manipulation of excitonic qubits in semiconductor quantum dots Decoherence processes during active manipulation of excitonic qubits in semiconductor quantum dots

2004-04-20

arxiv.org/abs/cond-mat/0404465v1

Physics

Condensed Matter

Other Condensed Matter

18 pages, 4 figures

Scientific paper

10.1103/PhysRevB.72.035306

Using photoluminescence spectroscopy, we have investigated the nature of Rabi oscillation damping during active manipulation of excitonic qubits in self-assembled quantum dots. Rabi oscillations were recorded by varying the pulse amplitude for fixed pulse durations between 4 ps and 10 ps. Up to 5 periods are visible, making it possible to quantify the excitation dependent damping. We find that this damping is more pronounced for shorter pulse widths and show that its origin is the non-resonant excitation of carriers in the wetting layer, most likely involving bound-to-continuum and continuum-to-bound transitions.

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