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学术报告:Detecting and Estimating Genuine Multipartite Entanglement and Coherence

发布日期:2022年04月11日 09:33 作者: 访问量:


报告人:张成杰 教授 (宁波大学)

报告时间:2022.4.14(周四) 14:15-15:15

报告地点:腾讯会议 212 289 364

报告摘要:Experimentally quantifying entanglement and coherence are extremely important for quantum resource theory. However, because the quantum state tomography requires exponentially growing measurements with the number of qubits, it is hard to quantify entanglement and coherence based on the full information of the experimentally realized multipartite states. Fortunately, other methods have been found to directly measure the fidelity of experimental states without quantum state tomography. Here we present a fidelity-based method to derive experimentally accessible lower bounds for measures of genuine multipartite entanglement and coherence. On the one hand, the method works for genuine multipartite entanglement measures including the convex-roof extended negativity, the concurrence, the G-concurrence, and the geometric measure for genuine multipartite entanglement. On the other hand, the method also delivers observable lower bounds for the convex roof of the l1-norm of coherence, the geometric measure of coherence, and the coherence of formation. Furthermore, all the lower bounds are based on the fidelity between the chosen pure state and the target state, and we obtain the lower bounds of several real experimental states as examples of our results.

 

个人简介:张成杰,宁波大学物理科学与技术学院教授,博士研究生导师。2010年毕业于中国科学技术大学量子信息重点实验室,获博士学位。2010-2014年在新加坡国立大学量子技术中心做博士后。研究方向主要是量子纠缠、量子相干性、量子非局域性、非厄米量子系统等。长期担任Phys. Rev. Lett., Phys. Rev. A, New J. Phys.等国际物理杂志的审稿人。在Phys. Rev. Lett.、Optica、Nature Commun.、Physical Review Applied、Physical Review A/B/D等杂志发表论文四十多篇,总他引1200余次。