2018/10/11 by Han-Sen Zhong, Yuan Li, Wei Li +17 · 2 citations
Physics and Astronomy · #quant-ph #physics.optics
paper · pdf · doi:10.1103/physrevlett.121.250505
published as Phys. Rev. Lett. 121, 250505 (2018) · 17 pages, 5 figures. the make-SPDC-great-again paper
arxiv created 2018/10/11 · arxiv updated 2019/05/02
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.