In this letter, we report a realization of synchronization-free quantum teleportation and narrowband three-photon entanglement through interfering narrowband photon sources. Since both the single-photon and the entangled photon pair utilized are completely autonomous, it removes the requirement of high demanding synchronization technique in long-distance quantum communication with pulsed spontaneous parametric down-conversion sources. The frequency linewidth of the three-photon entanglement realized is on the order of several MHz, which matches the requirement of atomic ensemble based quantum memories. Such a narrowband multi-photon source will have applications in some advanced quantum communication protocols and linear optical quantum computation.
@article{arxiv.0901.0351,
title = {Experimental Quantum Teleportation and Multi-Photon Entanglement via Interfering Narrowband Photon Sources},
author = {Jian Yang and Xiao-Hui Bao and Han Zhang and Shuai Chen and Cheng-Zhi Peng and Zeng-Bing Chen and Jian-Wei Pan},
journal= {arXiv preprint arXiv:0901.0351},
year = {2009}
}