Conference PaperUltra-Large Cross-Phase Modulation for Room-Temperature Photon-Number-Resolving DetectionZhao, Y; Okawachi, Y. andWe propose and analyze a room-temperature photon-number-resolving detection scheme based on cascaded sum-frequency generation. We measure an effective |n2| of 6×10−12 cm2/W in lithium niobate, which is 600x larger than the intrinsic value.2022-04-0110347251CLEO: QELS_Fundamental Science 2022https://doi.org/10.1364/CLEO_QELS.2022.FTh5O.32110615; 1936345National Science Foundation