Imperfections in practical detectors, including limited detection efficiency, and inherent electronic noise, can seriously decrease the transmission distance of continuous-variable measurement-device-independent quantum key distribution systems. Owing to the difficulties inherent in realizing a high-efficiency fiber homodyne detector, challenges still exist in continuous-variable measurement-device-independent quantum key distribution system implementation. We offer an alternative approach in an attempt to solve these difficulties and improve the potential for system implementation. Here, a novel practical detector modeling method is utilized, which is combined with a one-time shot-noise-unit calibration method for the purpose of system realization. The new modeling method benefits greatly from taking advantage of one-time shot-noise-unit calibration methods, such as measuring electronic noise and shot noise directly to a novel shot-noise unit, so as to eliminate the statistical fluctuations found in previous methods; this makes the implementation of such systems simpler, and the calibration progress more accurate. We provide a simulation of the secret key rate versus distance with different parameters. In addition, the minimal detection efficiency required at each distance, as well as the contrast between the two methods, are also shown, so as to provide a reference in terms of system realization.

实际探测器中的缺陷，包括有限的探测效率和固有的电子噪声，会严重降低连续可变测量设备独立量子密钥分发系统的传输距离。由于实现高效光纤零差探测器固有的困难，连续可变测量设备独立量子密钥分发系统的实现仍然存在挑战。我们提供了一种替代方法，试图解决这些困难并提高系统实施的潜力。在这里，一种新颖实用的探测器建模方法被利用，结合一次性散粒噪声单元校准方法，以实现系统实现。新的建模方法受益于一次性散粒噪声单元校准方法的优势，例如直接测量电子噪声和散粒噪声到一个新的散粒噪声单元，从而消除了以前方法中发现的统计波动；这使得此类系统的实施更简单，校准过程更准确。我们提供了具有不同参数的密钥速率与距离的模拟。此外，还给出了每个距离所需的最小检测效率，以及两种方法之间的对比，为系统实现提供参考。这使得此类系统的实施更简单，校准过程更准确。我们提供了具有不同参数的密钥速率与距离的模拟。此外，还给出了每个距离所需的最小检测效率，以及两种方法之间的对比，以便为系统实现提供参考。这使得此类系统的实施更简单，校准过程更准确。我们提供了具有不同参数的密钥速率与距离的模拟。此外，还给出了每个距离所需的最小检测效率，以及两种方法之间的对比，以便为系统实现提供参考。