Abstract
To generate entangled photon pairs via quantum dots (QDs), the exciton fine-structure splitting (FSS) must be comparable to the exciton homogeneous linewidth. Yet in the QD, the intrinsic FSS is about a few tens . To achieve photon entanglement, it is necessary to cherry-pick a sample with extremely small FSS from a large number of samples or to apply a strong in-plane magnetic field. Using theoretical modeling of the fundamental causes of FSS in QDs, we predict that the intrinsic FSS of QDs is an order of magnitude smaller than that of dots, and, better yet, their excitonic gap matches the fiber optic wavelength and, therefore, offers efficient on-demand entangled photon emitters for long distance quantum communication.
- Received 2 June 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.157405
©2008 American Physical Society