Heralded single-photon source(HSPS)intrinsically suffers from the trade-off between the heralded single-photon rate and the single-photon purity.To break through this trade-off,one can apply multiplexing technology in different degrees of freedom that significantly improves the performance of the HSPS.Here,we propose a 1.5 pm chip-scale HSPS on lithium niobate on insulator by employing spectral multiplexing and active feed-forward spectral manipulating,and we demonstrate a proof-of-principle experiment with discrete fiber-based components.With continuous-wave laser pumping and three spectral modes multiplexed,our experimental results show that the spectral multiplexing improves the heralded single-photon rate by near threefold while keeping the g(2)(0)as low as 0.0006±0.0001 at a measured single-photon rate of 3.1 kHz.By measuring the joint spectral intensity,we show that the spectral multiplexing and feed-forward control effectively erase the frequency correlation of photon pairs.Moreover,we implement the Hong-Ou-Mandel interference between the spectrally multiplexed single photons and photons from an independent weak coherence source,which in-dicates that the multiplexed single photons are highly indistinguishable after the spectral manipulation.Our results pave a way for on-chip scalable and high-performance HSPS with spectral multiplexing toward determin-istic single-photon emission.

HAO YU;CHENZHI YUAN;RUIMING ZHANG;ZICHANG ZHANG;HAO LI;YOU WANG;GUANGWEI DENG;LIXING YOU;HAIZHI SONG;ZHIMING WANG;GUANG-CAN GUO;QIANG ZHOU

Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 610054,China;Institut national de la recherche scientifique-Centre énergie,Matériaux et Télécommunications(INRS-EMT),Varennes,Quebec J3X 1S2,Canada;Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China;Southwest Institute of Technical Physics,Chengdu 610041,China;Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China;School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China

光子学研究（英文）

[1]HAO YU;CHENZHI YUAN;RUIMING ZHANG;ZICHANG ZHANG;HAO LI;YOU WANG;GUANGWEI DENG;LIXING YOU;HAIZHI SONG;ZHIMING WANG;GUANG-CAN GUO;QIANG ZHOU-.Spectrally multiplexed indistinguishable single-photon generation at telecom-band)[J].光子学研究（英文）,2022(06):1417-1429

Spectrally,Heralded,HSPS

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