Photon conversion in thin-film lithium niobate nanowaveguides: a noise analysis
Photon conversion in thin-film lithium niobate nanowaveguides: a noise analysis
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DOI：
10.1364/josab.425318
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发表时间：
2021-02
影响因子：
1.9
通讯作者：
Heng Fan;Zhaohui Ma;Jia-yang Chen;Zhan Li;Chao Tang;Y. Sua;Yu-Ping Huang
中科院分区：
文献类型：
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作者：
Heng Fan;Zhaohui Ma;Jia-yang Chen;Zhan Li;Chao Tang;Y. Sua;Yu-Ping Huang
单光子信号的波长转换对于网络化量子应用是不可或缺的，特别是那些包含量子存储器的应用。锂酸盐纳米光子器件已经表现出良好的线性、非线性和电光特性，以提供这一关键功能，同时提供上级效率、可集成性和可扩展性。然而，它们的量子噪声水平对于任何基于单光子的应用来说都是一个至关重要的指标还有待研究。在这项工作中，我们报告的第一个，据我们所知，研究的重点是电信近可见光转换驱动的一个小失谐电信泵在光纤网络上的分布式量子处理的实际考虑。我们的研究结果发现，对于高转换，每个时频模式的噪声水平约为10−4个光子，从而实现了可靠的脉冲操作。通过仔细分析这种噪声的来源以及它们与泵浦功率和波长失谐的依赖关系，我们还确定了一个将噪声抑制到每模10−5个光子的公式。我们的研究结果表明，一个可行的，低成本的，模块化的方法，网络化的量子处理和超越使用锂离子纳米光子。
Wavelength transduction of single-photon signals is indispensable to networked quantum applications, particularly those incorporating quantum memories. Lithium niobate nanophotonic devices have demonstrated favorable linear, nonlinear, and electro-optical properties to deliver this crucial function while offering superior efficiency, integrability, and scalability. Yet, their quantum noise level—a crucial metric for any single-photon-based application—has yet to be investigated. In this work, we report the first, to the best of our knowledge, study with the focus on telecom to near-visible conversion driven by a small detuned telecom pump for practical considerations in distributed quantum processing over fiber networks. Our results find the noise level to be on the order of 10−4 photons per time-frequency mode for high conversion, allowing faithful pulsed operations. Through carefully analyzing the origins of such noise and each’s dependence on the pump power and wavelength detuning, we have also identified a formula for noise suppression to 10−5 photons per mode. Our results assert a viable, low-cost, and modular approach to networked quantum processing and beyond using lithium niobate nanophotonics.