In this paper, we demonstrate integrated photonic chips for multichannel quantum frequency conversion (QFC) based on reverse-proton-exchange periodically poled lithium niobate waveguides. The integrated chip is fiber coupled with two 34-channel fiber arrays, showing an average fiber-to-fiber sum-frequency generation (SFG) conversion efficiency of about 60% for multichannels. Then the same integrated chip is used to perform multichannel differential-frequency generation (DFG), showing the potential application in long-distance multimode quantum memory. Moreover, the integrated chip is utilized to construct a multichannel up-conversion detector, which has extensive applications including deep-space laser communication, high-rate quantum-key distribution, and single-photon imaging.

中文翻译：

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集成多通道铌酸锂波导，用于量子频率转换

在本文中，我们演示了基于反向质子交换周期性极化的铌酸锂波导的多通道量子频​​率转换（QFC）集成光子芯片。集成芯片通过光纤与两个34通道光纤阵列耦合，显示出多通道的平均光纤到光纤总和频率生成（SFG）转换效率约为60％。然后，同一块集成芯片用于执行多通道差分频率生成（DFG），显示了在长距离多模量子存储器中的潜在应用。此外，集成芯片被用于构造多通道上转换检测器，其具有广泛的应用，包括深空间激光通信，高速率量子密钥分配和单光子成像。