近日，华东师范大学荆杰泰团队研究了量子网络中与测量设备无关的连续变量纠缠见证。相关论文于2025年11月3日发表在《光：科学与应用》杂志上。

量子纠缠的可靠检测在量子网络的构建中起着至关重要的作用。传统的纠缠见证法对测量装置的要求较高，且依赖于测量的可靠实现。由于测量装置不可靠，电子战过程容易受到窃听者的攻击，从而导致不正确的纠缠检测结果。因此，需要一种可行且安全的测量设备独立纠缠见证（MDIEW）方法来构建量子网络。

研究组利用MDIEW检测量子网络中的连续变量纠缠。结果表明，当本振强度发生变化时，传统的电子战方法会受到影响，而MDIEW方法可以在不受影响的情况下检测到各应用之间的纠缠。该研究结果提供了一种有价值的方法来检测纠缠，这是构建安全量子网络的重要一步。

附：英文原文

Title: Measurement-device-independent continuous variable entanglement witness in a quantum network

Author: Fu, Jing, Wang, Xutong, Liu, Shengshuai, Jing, Jietai

Issue&Volume: 2025-11-03

Abstract: The reliable detection of entanglement plays a crucial role in the construction of quantum networks. The conventional entanglement witness (EW) method has high requirements for measurement device and relies on reliable implementation of the measurement. With unreliable measurement device, EW process can be easily attacked by eavesdroppers, which can lead to incorrect entanglement detection results. Therefore, a feasible and secure measurement device independent entanglement witness (MDIEW) method is desired for constructing quantum networks. Here, we detect the continuous variable entanglement by a MDIEW in a quantum network. It is demonstrated that the conventional EW method can be affected when the local oscillator intensity is changed, while the MDIEW method can detect entanglement between users without being affected. Our results provide a trustworthy method to detect entanglement, which is an important step for constructing secure quantum networks.

DOI: 10.1038/s41377-025-02039-x

Source: https://www.nature.com/articles/s41377-025-02039-x