期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.250505
关键词
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资金
- National Natural Science Foundation of China [91836303]
- Chinese Academy of Sciences
- National Fundamental Research Program
- Anhui Initiative in Quantum Information Technologies
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 x 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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