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Just saw this article from a highly respected research team, and thought some might enjoy seeing how the state of the art continues to develop rapidly:
12-photon entanglement and scalable scattershot boson sampling with optimal entangled-photon pairs from parametric down-conversion
Han-Sen Zhong, Yuan Li, Wei Li, Li-Chao Peng, Zu-En Su, Yi Hu, Yu-Ming He, Xing Ding, W.-J. Zhang, Hao Li, L. Zhang, Z. Wang, L.-X. You, Xi-Lin Wang, Xiao Jiang, Li Li, Yu-Ao Chen, Nai-Le Liu, Chao-Yang Lu, Jian-Wei Pan
https://arxiv.org/abs/1810.04823
Some of the key issues in developing practical uses of entanglement in quantum communications are i) producing the entanglement on demand; or alternately ii) knowing the entanglement is coming in advance. The second is called "heralding". In the usual protocols, you don't know if you have an entangled pair coming until it arrives. In this novel experiment, which I am still trying to fully absorb, there is heralding along with the type of entanglement needed for communications. From the abstract:
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.
12-photon entanglement and scalable scattershot boson sampling with optimal entangled-photon pairs from parametric down-conversion
Han-Sen Zhong, Yuan Li, Wei Li, Li-Chao Peng, Zu-En Su, Yi Hu, Yu-Ming He, Xing Ding, W.-J. Zhang, Hao Li, L. Zhang, Z. Wang, L.-X. You, Xi-Lin Wang, Xiao Jiang, Li Li, Yu-Ao Chen, Nai-Le Liu, Chao-Yang Lu, Jian-Wei Pan
https://arxiv.org/abs/1810.04823
Some of the key issues in developing practical uses of entanglement in quantum communications are i) producing the entanglement on demand; or alternately ii) knowing the entanglement is coming in advance. The second is called "heralding". In the usual protocols, you don't know if you have an entangled pair coming until it arrives. In this novel experiment, which I am still trying to fully absorb, there is heralding along with the type of entanglement needed for communications. From the abstract:
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.