Reducing decoherence of the confined exciton state in a quantum dot by pulse-sequence control

Titelangaben

Axt, Vollrath Martin ; Machnikowski, Paweł ; Kuhn, Tilmann:
Reducing decoherence of the confined exciton state in a quantum dot by pulse-sequence control.
In: Physical Review B. Bd. 71 (2005) Heft 15 . - 155305.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.71.155305

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Abstract

We study the phonon-induced dephasing of the exciton state in a quantum dot excited by a sequence of ultrashort pulses. We show that the multiple-pulse control leads to a considerable improvement of the coherence of the optically excited state. For a fixed control time window, the optimized pulsed control often leads to a higher degree of coherence than the control by a smooth, single Gaussian pulse. The reduction of dephasing is considerable already for 2–3 pulses.