The initial proposal for scalable optical quantum computing required single photon sources, linear optical elements such as beamsplitters and phaseshifters, and photon detection. Here we demonstrate a two qubit gate using indistinguishable photons from a quantum dot in a pillar microcavity. As the emitter, the optical circuitry, and the detectors are all semiconductor, this is a promising approach towards creating a fully integrated device for scalable quantum computing.
@article{arxiv.1205.4899,
title = {Controlled-NOT gate operating with single photons},
author = {M. A. Pooley and D. J. P. Ellis and R. B. Patel and A. J. Bennett and K. H. A. Chan and I. Farrer and D. A. Ritchie and A. J. Shields},
journal= {arXiv preprint arXiv:1205.4899},
year = {2012}
}