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Ultra-Short Pulse Biphoton Source in Lithium Niobate Nanophotonics at 2 \textmu m
preprintposted on 2024-02-10, 17:00 authored by James Williams, Rajveer Nehra, Elina Sendonaris, Luis Ledezma, Robert M. Gray, Ryoto Sekine, Alireza Marandi
Photonics offers unique capabilities for quantum information processing (QIP) such as room-temperature operation, the scalability of nanophotonics, and access to ultrabroad bandwidths and consequently ultrafast operation. Ultrashort-pulse sources of quantum states in nanophotonics are an important building block for achieving scalable ultrafast QIP, however, their demonstrations so far have been sparse. Here, we demonstrate a femtosecond biphoton source in dispersion-engineered periodically poled lithium niobate nanophotonics. We measure 17 THz of bandwidth for the source centered at 2.09 \textmu m, corresponding to a few optical cycles, with a brightness of 8.8 GHz/mW. Our results open new paths towards realization of ultrafast nanophotonic QIP.