Ultra-bright Quantum Photon Sources on Chip
Zhaohui Ma, Jia-Yang Chen, Zhan Li, Chao Tang, Yong Meng Sua, Heng, Fan, and Yu-Ping Huang

TL;DR
This paper demonstrates on-chip quantum photon sources with unprecedented brightness and efficiency, enabling high-rate photon-pair and single-photon generation suitable for scalable quantum information applications.
Contribution
It introduces a chip-based microresonator that achieves ultra-bright, high-rate photon-pair and single-photon sources with significantly improved performance over existing technologies.
Findings
Photon-pair generation rates of 8.5 MHz and 36.3 MHz at low pump powers
Coincidence to accidental ratio exceeding 14,000 at lower pump power
Heralded single-photon generation at tens of megahertz with low auto-correlation
Abstract
Quantum photon sources of high rate, brightness, and purity are increasingly desirable as quantum information systems are quickly scaled up and applied to many fields. Using a periodically poled lithium niobate microresonator on chip, we demonstrate photon-pair generation at high rates of 8.5 MHz and 36.3 MHz using only 3.4-W and 13.4-W pump power, respectively, marking orders of magnitude improvement over the state-of-the-art. The measured coincidence to accidental ratio is well above 100 at those high rates and reaches at a lower pump power. The same chip enables heralded single-photon generation at tens of megahertz rates, each with low auto-correlation and for the microwatt pumps. Such distinct performance, facilitated by the chip device's noiseless and giant optical nonlinearity, will contribute to the forthcoming pervasive…
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