Highly efficient and pure few-photon source on chip

• DOI: 10.1103/physrevapplied.20.044033
• Publication Date: 2023-10-12T15:36:28Z
• Authors: Zhaohui Ma; Jia-Yang Chen; Malvika Garikapati; Zhan Li; Chao Tang; Yong Meng Sua; Yu-Ping Huang
• Keywords: Single-Photon Source

We report on multiphoton statistics of correlated twin beams produced in a periodic poled microring resonator thin-film lithium niobate. Owing to high-cavity confinement and near-perfect quasi-phase-matching, the photon pairs are efficiently single modes at rates reaching 27 MHz per $\text{\ensuremath{\mu}}\mathrm{W}$ pump power. By using laser whose pulse-width impedance matches with cavity, those photons further created longitudinal purity 99%, without relying later-on filtering. With dual-channel photon-number-resolving detection system, we obtain directly joint probabilities states up three photons, high coincidence accidental contrast for each. Used as single-photon source, it gives heralded ${g}_{H}^{(2)}(0)$ around 0.04 rate 650 kHz chip. The findings our research highlight potential this nanophotonic platform promising generating nonclassical, few-photon ideal indistinguishability, fundamental quantum optics studies information applications.