Highly Reduced Fine-Structure Splitting in InAs/InP Quantum Dots Offering an Efficient On-Demand Entangled 1.55-μm Photon Emitter

Lixin He, Ming Gong, Chuan-Feng Li, Guang-Can Guo, and Alex Zunger
Phys. Rev. Lett. 101, 157405 – Published 9 October 2008

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 (In,Ga)As/GaAs QD, the intrinsic FSS is about a few tens μeV. 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 1.55μm fiber optic wavelength and, therefore, offers efficient on-demand entangled photon emitters for long distance quantum communication.

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  • Received 2 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.157405

©2008 American Physical Society

Authors & Affiliations

Lixin He1,*, Ming Gong1, Chuan-Feng Li1, Guang-Can Guo1, and Alex Zunger2

  • 1Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, People’s Republic of China
  • 2National Renewable Energy Laboratory, Golden, Colorado 80401, USA

  • *Corresponding author. helx@ustc.edu.cn

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Vol. 101, Iss. 15 — 10 October 2008

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