A thin-film lithium niobate waveguide generates bright, low-noise photon pairs at 815 nm and 1550 nm with a heralded second-order correlation g^(2)(0) of 0.0067.
Ultra-Short Pulse Biphoton Source in Lithium Niobate Nanophotonics at 2$\text{\mu}$m
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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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quant-ph 1years
2025 1verdicts
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A ultrabright, two-colour photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths
A thin-film lithium niobate waveguide generates bright, low-noise photon pairs at 815 nm and 1550 nm with a heralded second-order correlation g^(2)(0) of 0.0067.