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AIP conference proceedings

Decoherence Suppression of Excitons in Semiconductor using Sequential Femtosecond Pulses

T.E. Kishimoto, H. Takahashi, A. Sato, Atsushi Hasegawa, M. Sasaki, F. Minami

Published Jan 1, 2007• 0 citations
Publisher

Abstract

We report the demonstration of decoherence control on excitons in a layered compound semiconductor GaSe by using successive femtosecond pulses, i.e., the multi‐wave mixing method. The intermediate pulse acts as a π‐pulse, which reverses the time evolution of non‐Markovian dynamics. By changing the pulse interval conditions, we confirmed the suppression of exciton decoherence by pulse irradiation.

DOI
10.1063/1.2729822

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We report the demonstration of decoherence control on excitons in a layered compound semiconductor GaSe by using successive femtosecond pulses, i.e., the multi‐wave mixing method. The intermediate pulse acts as a π‐pulse, which reverses the time evolution of non‐Markovian dynamics. By changing the pulse interval conditions, we confirmed the suppression of exciton decoherence by pulse irradiation.
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We present a theory to further a new perspective of proactive control of exciton dynamics in the quantum limit. Circularly polarized optical pulses in a semiconductor nanodot are used to control the dynamics of two interacting excitons of opposite polarizations. Shaping of femtosecond laser pulses keeps the quantum operation within the decoherence time. Computation of the fidelity of the operations and application to the complete solution of a minimal quantum computing algorithm demonstrate in theory the feasibility of quantum control.
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