Biexciton quantum coherence in a single quantum dot.
Nondegenerate (two-wavelength) two-photon absorption using coherent optical fields is used to show that there are two different quantum mechanical pathways leading to formation of the biexciton in a single quantum dot. Of specific importance to quantum information applications is the resulting coherent dynamics between the ground state and the biexciton from the pathway involving only optically induced exciton/biexciton quantum coherence. The data provide a direct measure of the biexciton decoherence rate which is equivalent to the decoherence of the Bell state in this system, as well as other critical optical parameters.
Chen
Gang
G
The FOCUS Center, Harrison M. Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA.
Stievater
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Batteh
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Li
Xiaoqin
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Steel
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DG
Gammon
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Katzer
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Park
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Sham
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