Electric-field-induced coherent coupling of the exciton states in a single quantum dot

Details Electric-field-induced coherent coupling of the exciton states in a single quantum dot Electric-field-induced coherent coupling of the exciton states in a single quantum dot

2012-03-27

arxiv.org/abs/1203.5909v1

Nature Physics 6, 947-950 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1038/nphys1780

The signature of coherent coupling between two quantum states is an anticrossing in their energies as one is swept through the other. In single semiconductor quantum dots containing an electron-hole pair the eigenstates form a two-level system that can be used to demonstrate quantum effects in the solid state, but in all previous work these states were independent. Here we describe a technique to control the energetic splitting of these states using a vertical electric field, facilitating the observation of coherent coupling between them. Near the minimum splitting the eigenstates rotate in the plane of the sample, being orientated at 45{\deg} when the splitting is smallest. Using this system we show direct control over the exciton states in one quantum dot, leading to the generation of entangled photon pairs.

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