Hyper-entangled photon pairs from single quantum dots
Geng Chen, Chuan‐Feng Li, Zhen−Qiang Yin, Yang Zou, Lixin He, Guang‐Can Guo · Europhysics Letters (EPL) · 2010
We propose a scheme to generate hyper-entangled photon pairs from single quantum dots (SQDs). Single photons emitted by SQD are manipulated to be entangled after post-selection. Crucially, exciton fine-structure splitting, which was previously deemed undesirable in similar schemes, is used here to produce photon pairs entangled in both frequency and polarization degrees of freedom. This hyper-entangled two-photon state is potentially more powerful than a normal entangled state for quantum state engineering and quantum information processing.