The feasibility of transmitting discrete-variable quantum key distribution channels with carrier-grade classical optical channels over multicore fibers is experimentally explored in terms of achievable quantum bit error rates, secret key rates as well as classical signal bit error rates. A coexistence transmission record of 11.2 Tb/s is achieved for the classical channels simultaneously with a DV-QKD channel over a 1 km-long 7-core multicore fiber. Coexistence over the same multicore fiber core is identified as a dominant factor for the performance of the quantum channel requiring optical bandpass filtering of 17 nm for the quantum channel to avoid the effect of Raman noise. Also, counter-propagation of classical channels and quantum channels probe more tolerance to noise proliferation than co-propagation. In addition, the performance of the quantum channel is maintained when more than three cores are used for the classical channels. Furthermore, by adding a second DV-QKD channel in the multicore fiber, the simultaneous transmission of classical channels as well as the generation of quantum-secured keys of two QKD channels is achieved with an operational range of 10 dB of launched power into the MCF.

中文翻译：

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11.2 Tb/s 经典信道与 DV-QKD 在 7 芯多芯光纤上的共存

在可实现的量子比特误码率、密钥误码率以及经典信号误码率方面，通过实验探索了在多芯光纤上使用运营商级经典光通道传输离散可变量子密钥分发通道的可行性。在 1 公里长的 7 芯多芯光纤上，经典信道与 DV-QKD 信道同时实现了 11.2 Tb/s 的共存传输记录。同一个多芯光纤纤芯上的共存被认为是量子通道性能的主要因素，量子通道需要 17 nm 的光学带通滤波以避免拉曼噪声的影响。此外，经典通道和量子通道的反向传播比共同传播更能容忍噪声扩散。此外，当超过三个内核用于经典通道时，量子通道的性能得以保持。此外，通过在多芯光纤中添加第二个 DV-QKD 通道，实现了经典通道的同时传输以及两个 QKD 通道的量子安全密钥的生成，操作范围为 10 dB 的发射功率到 MCF .