近日，杭州师范大学孙永南团队实现了通过非投影测量对最大纠缠态的实验性稳健认证。2025年7月28日出版的《物理评论A》杂志发表了这项成果。

纠缠是量子力学的基础，以与设备无关的方式对纠缠态的准确认证对于安全量子信息处理的功能至关重要。以往对纠缠态认证的研究主要依赖于射影测量，而基于非射影测量的纠缠态实验认证仍然是一个未开发的领域。

研究组通过实验证明了单侧器件无关场景下双量子位最大纠缠态主题三结果非投影测量。基于转向不等式的最大违逆，他们可以实验自检最大纠缠态和由非纠缠方进行的非投影测量。此外，研究组还通过实验证明，当白噪声引入到状态和测量中时，该方法是高度自动化的。他们的工作使人们能够进一步深入了解非投影测量的量子态认证。

附：英文原文

Title: Experimental robust certification of the maximally entangled state via nonprojective measurements

Author: Meng-Yun Ma, Chao-Jie Sun, Xu Xu, Kai-Mei Zheng, Han-Yu Cheng, Qi-Ping Su, Chui-Ping Yang, Yong-Nan Sun

Issue&Volume: 2025/07/28

Abstract: Entanglement is fundamental to quantum mechanics, and accurate certification of entangled states in a device-independent manner is crucial to the functioning of secure quantum information processing. Previous research on entanglement certification primarily relies on projective measurements, while experimental certification of entangled states based on nonprojective measurements remains an unexplored area. In this work, we experimentally certify the two-qubit maximally entangled state using three-outcome nonprojective measurements in the one-sided device-independent scenario. Based on the maximal violation of steering inequality, we can experimentally self-test both the maximally entangled state and the nonprojective measurements performed by the untrusted party. Furthermore, we also experimentally demonstrate that this approach is highly robust when white noise is introduced into the states and measurements. Our work enables further insight into the quantum state certification with nonprojective measurements.

DOI: 10.1103/qs8r-kjms

Source: https://journals.aps.org/pra/abstract/10.1103/qs8r-kjms