Highly Reduced Fine-Structure Splitting in InAs/InP Quantum Dots Offering an Efficient On-Demand Entangled 1.55-..mu..m Photon Emitter
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 (In,Ga)As/GaAs QD, the intrinsic FSS is about a few tens {micro}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 a 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 {mu} fiber optic wavelength and, therefore, offers efficient on-demand entangled photon emitters for long distance quantum communication.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1022323
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15, 10 October 2008 Vol. 101; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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