Entangled photon sources with simultaneously near-unity heralding efficiency and indistinguishability are the fundamental elements for scalable photonic quantum technologies. We design and realize a degenerate entangled-photon source from an ultrafast pulsed laser pumped spontaneous parametric down-conversion (SPDC), which show simultaneously ~97% heralding efficiency and ~96% indistinguishability between independent single photons. Such a high-efficiency and frequency-uncorrelated SPDC source allows generation of the first 12-photon genuine entanglement with a state fidelity of 0.572(24). We further demonstrate a blueprint of scalable scattershot boson sampling using 12 SPDC sources and a 12*12-modes interferometer for three-, four-, and five-boson sampling, which yields count rates more than four orders of magnitudes higher than all previous SPDC experiments. Our work immediately enables high-efficiency implementations of multiplexing, scattershot boson sampling, and heralded creation of remotely entangled photons, opening up a promising pathway to scalable photonic quantum technologies.
@article{arxiv.1810.04823,
title = {12-photon entanglement and scalable scattershot boson sampling with optimal entangled-photon pairs from parametric down-conversion},
author = {Han-Sen Zhong and Yuan Li and Wei Li and Li-Chao Peng and Zu-En Su and Yi Hu and Yu-Ming He and Xing Ding and W. -J. Zhang and Hao Li and L. Zhang and Z. Wang and L. -X. You and Xi-Lin Wang and Xiao Jiang and Li Li and Yu-Ao Chen and Nai-Le Liu and Chao-Yang Lu and Jian-Wei Pan},
journal= {arXiv preprint arXiv:1810.04823},
year = {2019}
}
Comments
17 pages, 5 figures. the make-SPDC-great-again paper