Highly-reduced Fine-structure splitting in InAs/InP quantum dots offering efficient on-demand 1.55 m entangled photon emitter
arXiv:0806.0414 · doi:10.1103/PhysRevLett.101.157405
Abstract
To generate entangled photon pairs via quantum dots (QDs), the exciton fine structure splitting (FSS) must be comparable to the exciton homogeneous line width. Yet in the (In,Ga)As/GaAs QD, the intrinsic FSS is about a few tens eV. 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 strong in-plane magnetic field. Using theoretical modeling of the fundamental causes of FSS in QDs, we predict that the intrinsic FSS of InAs/InP QDs is an order of magnitude smaller than that of InAs/GaAs dots, and better yet, their excitonic gap matches the 1.55 m fiber optic wavelength, therefore offer efficient on-demand entangled photon emitters for long distance quantum communication.
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