DV-QKD Coexistence With 1.6 Tbps Classical Channels Over Hollow Core Fibre
DV-QKD Coexistence With 1.6 Tbps Classical Channels Over Hollow Core Fibre
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DOI：
10.1109/jlt.2022.3180232
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发表时间：
2022-08-15
影响因子：
4.7
通讯作者：
Simeonidou, Dimitra
中科院分区：
文献类型：
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作者：
Alia, Obada;Tessinari, Rodrigo S.;Simeonidou, Dimitra
首次在可实现的量子误码率（QBER）、密钥率（SKR）以及经典信号误码率（BER）方面通过实验探索了在空心嵌套反谐振无节点光纤（HC-NANF）上共存量子通道与电信级经典光通道的可行性。在2公里长的HC-NANF上，经典信道与量子信道同时实现了1.6 Tbps的共存传输，总共存功率为0 dBm。为了找到经典通道的最佳和最差波长位置，考虑到量子通道上拉曼散射和四波混合（FWM）产生的串扰，我们模拟了量子通道和经典通道之间具有不同间距的不同经典通道频带。在我们的模拟之后，我们以 SKR 和 QBER 的形式对经典通道的最佳位置（拉曼光谱倾角）和最差位置（拉曼光谱峰值）进行数值估计，以了解其对量子通道性能的影响。我们进一步实现了一个测试台，在最好和最坏的情况下对单模光纤 (SMF) 和 HC-NANF 进行实验测试。在最佳情况下，量子通道和经典通道之间的间隔为 200 GHz（1.6 nm），每个经典通道之间的间隔为 50 GHz（0.4 nm）。当在 HC-NANF 中以 0 dBm 总共存功率共存量子信道与 8 个经典信道时，SKR 保持不变，没有任何明显变化，而在 -24 dBm 总共存功率（比 HC-NANF 中使用的功率低 250 倍）使用 SMF 时，SKR 显着下降 73%。在最坏的情况下，使用相同的功率，并且量子通道和经典通道之间的间隔为 1 THz (8 nm)，使用 HC-NANF 时 SKR 下降了 10%，而在 SMF 中，SKR 骤降至零。
The feasibility of coexisting a quantum channel with carrier-grade classical optical channels over Hollow Core Nested Antiresonant Nodeless Fibre (HC-NANF) is experimentally explored for the first time in terms of achievable quantum bit error rate (QBER), secret key rate (SKR) as well as classical signal bit error rates (BER). A coexistence transmission of 1.6 Tbps is achieved for the classical channels simultaneously with a quantum channel over a 2 km-long HC-NANF with a total coexistence power of 0 dBm. To find the best and worst wavelength position for the classical channels, we simulated different classical channels bands with different spacing between the quantum and classical channels considering the crosstalk generated from both Raman scattering and four-wave-mixing (FWM) on the quantum channel. Following our simulation, we numerically estimate the best (Raman spectrum dip) and worst locations (Raman spectrum peak) of the classical channel with respect to its impact on the performance on the quantum channel in terms of SKR and QBER. We further implemented a testbed to experimentally test both single-mode fibre (SMF) and HC-NANF in the best and worst-case scenarios. In the best-case scenario, the spacing between quantum and classical is 200 GHz (1.6 nm) with 50 GHz (0.4 nm) spacing between each classical channel. The SKR was preserved without any noticeable changes when coexisting the quantum channel with eight classical channels at 0 dBm total coexistence power in HC-NANF compared to a significant drop of 73% when using SMF at -24 dBm total coexistence power which is 250 times lower than the power used in HC-NANF. In the worst-case scenario using the same powers, and with 1 THz (8 nm) spacing between quantum and classical channels, the SKR dropped 10% using the HC-NANF, whereas in the SMF the SKR plummeted to zero.