Ma Zhaohui, Chen Jia-Yang, Li Zhan, Tang Chao, Sua Yong Meng, Fan Heng, Huang Yu-Ping
Department of Physics, Stevens Institute of Technology, 1 Castle Point Terrace, Hoboken, New Jersey 07030, USA and Center for Quantum Science and Engineering, Stevens Institute of Technology, 1 Castle Point Terrace, Hoboken, New Jersey 07030, USA.
Phys Rev Lett. 2020 Dec 31;125(26):263602. doi: 10.1103/PhysRevLett.125.263602.
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 and 36.3 MHz using only 3.4 and 13.4 μW pump power, respectively, marking orders of magnitude improvement over the state of the art, across all material platforms. These results constitute the first direct measurement of the device's giant single photon nonlinearity. The measured coincidence to accidental ratio is well above 100 at those high rates and reaches 14682±4427 at a lower pump power. The same chip enables heralded single-photon generation at tens of megahertz rates, each with low autocorrelation g_{H}^{(2)}(0)=0.008 and 0.097 for the microwatt pumps, which marks a new milestone. Such distinct performance, facilitated by the chip device's noiseless and giant optical nonlinearity, will contribute to the forthcoming pervasive adoption of quantum optical information technologies.
随着量子信息系统迅速扩大规模并应用于许多领域，对高速率、高亮度和高纯度的量子光子源的需求日益增加。通过使用片上周期性极化铌酸锂微谐振器，我们分别仅使用3.4和13.4 μW的泵浦功率，就实现了8.5和36.3 MHz的高速率光子对产生，这在所有材料平台上都比现有技术有了几个数量级的提升。这些结果构成了对该器件巨大单光子非线性的首次直接测量。在这些高速率下，测得的符合与偶然比远高于100，在较低泵浦功率下达到14682±4427。同一芯片能够以数十兆赫兹的速率产生预告单光子，对于微瓦级泵浦，每个单光子的自相关g_{H}^{(2)}(0)分别为0.008和0.097，这标志着一个新的里程碑。这种由芯片器件的无噪声和巨大光学非线性所促成的独特性能，将有助于量子光学信息技术在未来的广泛应用。
