Abstract

Photonic quantum information experiments demand sources of single photons and entangled photon pairs. Quantum-dot based sources are very appealing because of their compactness, intrinsic sub-Poissonian photon statistics [1], and potential to generate photons deterministically [2]. Additionally, they can be integrated in a semiconductor-based optical circuit. Nevertheless, quantum dots are subject to in-plane geometrical asymmetry that causes fine structure splitting of the exciton states, which can dramatically reduce the achievable level of photon entanglement. In this respect, quantum dots embedded in nanowires were proposed to have an intrinsic geometrical symmetry [3] which means that the fine structure splitting should be absent in these systems.

© 2015 IEEE