Single photon or biphoton states propagating in optical fibers or in free space are affected by random perturbations and imperfections that disturb the information encoded in such states and accordingly quantum key distribution is prevented. We propose three different systems for autocompensating such random perturbations and imperfections when a measurement-device-independent protocol is used. These systems correspond to different optical fibers intended for space division multiplexing and supporting collinear modes, polarization modes or codirectional modes such as few-mode optical fibers and multicore optical fibers. Accordingly, we propose different Bell-states measurement devices located at Charlie system and present simulations that confirm the importance of autocompensation. Moreover, these types of optical fibers allow the use of several transmission channels, which compensates the reduction of the bit rate due to losses.

中文翻译：

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空分复用光纤中与测量设备无关的自动补偿量子密码

在光纤或自由空间中传播的单光子或双光子状态会受到随机扰动和缺陷的影响，这些干扰和缺陷会干扰以此类状态编码的信息，因此阻止了量子密钥分发。当使用独立于测量设备的协议时，我们提出了三种不同的系统来自动补偿这种随机扰动和缺陷。这些系统对应于不同的光纤，用于空分复用并支持共线模式、偏振模式或同向模式，例如少模光纤和多芯光纤。因此，我们提出了位于查理系统的不同贝尔状态测量设备，并提供了确认自动补偿重要性的模拟。而且，