12-Photon Entanglement and Scalable Scattershot Boson Sampling with Optimal Entangled-Photon Pairs from Parametric Down-Conversion

Han-Sen Zhong(University of Science and Technology of China), Yuan Li(CAS Key Laboratory of Urban Pollutant Conversion), Wei Li(CAS Key Laboratory of Urban Pollutant Conversion), Li-Chao Peng(University of Science and Technology of China), Zu-En Su(University of Science and Technology of China), Yi Hu(CAS Key Laboratory of Urban Pollutant Conversion), Yuming He(CAS Key Laboratory of Urban Pollutant Conversion), Xing Ding(University of Science and Technology of China), Weijun Zhang(Chinese Academy of Sciences), Hao Li(Chinese Academy of Sciences), Lu Zhang(Shanghai Institute of Microsystem and Information Technology), Zhen Wang(Chinese Academy of Sciences), Lixing You(Shanghai Institute of Microsystem and Information Technology), Xi‐Lin Wang(CAS Key Laboratory of Urban Pollutant Conversion), Xiao Jiang(University of Science and Technology of China), Li Li(University of Science and Technology of China), Yu-Ao Chen(University of Science and Technology of China), Nai-Le Liu(CAS Key Laboratory of Urban Pollutant Conversion), Chao‐Yang Lu(University of Science and Technology of China), Jian-Wei Pan(CAS Key Laboratory of Urban Pollutant Conversion)
Physical Review Letters
December 21, 2018
10.1103/physrevlett.121.250505
Cited by 409Open Access
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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 telecommunication wavelength entangled-photon source from an ultrafast pulsed laser pumped spontaneous parametric down-conversion (SPDC), which shows simultaneously 97% heralding efficiency and 96% indistinguishability between independent single photons without narrow-band filtering. Such a beamlike and frequency-uncorrelated SPDC source allows generation of the first 12-photon genuine entanglement with a state fidelity of 0.572±0.024. We further demonstrate a blueprint of scalable scattershot boson sampling using 12 SPDC sources and a 12×12 mode interferometer for three-, four-, and five-boson sampling, which yields count rates more than 4 orders of magnitude higher than all previous SPDC experiments.

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