报告人：陈芝花教授

报告时间：2026年1月6日下午 15：00

报告地址：腾讯会议861-472-081

报告摘要：In the noisy intermediate-scale quantum (NISQ) era, multipartite entanglement in realistic noisy environments exhibits complex structures. Characterizing entanglement structures—particularly entanglement depth and intactness—has become increasingly essential for quantum information processing tasks. Traditional methods like standard entanglement witnesses assume that experimenters can exactly implement specific quantum measurements. Even minor inaccuracies in standard witness can introduce significant errors in entanglement detection. We propose certification methods with relaxed assumptions about the system and measurements for entanglement structures. First, we classify entanglement states with the same intactness into three distinct types based on their depth. Next, we derive analytical witnesses to detect the entanglement structure of general n-qubit systems in both device-independent and semi-device-independent scenarios, where some observables are untrusted while others remain reliable. Furthermore, we extend our framework to account for small measurement imperfections, ensuring robustness in practical settings. We demonstrate that our witness can detect larger entanglement regions compared to previous Bell-type inequalities. Remarkably, for Type I 4-partite quantum states, our entanglement witness with measurement imperfections is identical to both device-dependent and semi-device-independent approaches.

报告人简介：陈芝花，集美大学教授、博士生导师，一直致力于量子信息学相关问题研究，在量子纠缠、量子导引、量子不确定性以及量子相干等方面获得了一些研究成果。以第一作者身份在《Phys. Rev. Lett.》、《Phys. Rev. A》等杂志上发表论文多篇。主持国家自然科学基金3项、福建省自然科学基金1项。