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arXiv · 2402.05163

Ultra-Short Pulse Biphoton Source in Lithium Niobate Nanophotonics at 2$\text{\mu}$m

James Williams·Rajveer Nehra·Elina Sendonaris·Luis Ledezma·Robert M. Gray·Ryoto Sekine·Alireza Marandi
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Abstract

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.

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James Williams, Rajveer Nehra, Elina Sendonaris, Luis Ledezma, Robert M. Gray, Ryoto Sekine, Alireza Marandi. 2024-02-07. Ultra-Short Pulse Biphoton Source in Lithium Niobate Nanophotonics at 2$\text{\mu}$m. https://arxiv.org/abs/2402.05163

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