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

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

2004-08-13

arxiv.org/abs/cond-mat/0408322v2

Phys. Rev. B 71 (2005) 155305

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final version (moderate changes)

Scientific paper

10.1103/PhysRevB.71.155305

We study the phonon-induced dephasing of the exciton state in a quantum dot excited by a sequence of ultra-short 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.

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