题目：Quantum information from discrete phase space

报告人：Huangjun Zhu (朱黄俊）  Institute for Theoretical Physics, University of Cologne, Cologne, Germany

地点： 教十二-201

时间：1月9日，周一，15:00-16:00

摘要：

Abstract:

Quantum computation can provide dramatic improvement over classical computation. Understanding the source of computational power has been a central problem in quantum information science. Recently, researchers have found deep connections between computational power and nonclassical phenomena known as contextuality and negativity of the discrete Wigner function. What is intriguing is a fundamental distinction between multiqubit systems and those of odd local dimensions. In this talk I will give an overview of this active research field from the perspective of the discrete phase space and explain where does this distinction come from. The applications of phase space methods to other subjects, such as quantum state discrimination and phase retrieval, will also be mentioned briefly.

References:

Huangjun Zhu, Permutation Symmetry Determines the Discrete Wigner Function, Phys. Rev. Lett.  116, 040501 (2016).

Huangjun Zhu, Quasiprobability representations of quantum mechanics with minimal negativity, Phys. Rev. Lett. 117, 120404 (2016).

Huangjun Zhu, Multiqubit Clifford groups are unitary 3-designs, http://arxiv.org/abs/1510.02619

M. Howard, J. Wallman, V. Veitch, and J. Emerson, Contextuality supplies the 'magic' for quantum computation, Nature 510, 351 (2014).

N. Delfosse, P. Allard Guerin, J. Bian, and R. Raussendorf, Wigner function negativity and contextuality in quantum computation on rebits, Phys. Rev. X 5, 021003 (2015).

个人简介：

朱黄俊博士本科毕业于浙江大学物理系，硕士在北京大学物理学院，博士在新加坡国立大学量子技术中心。之后在加拿大圆周理论物理研究所和德国科隆理论物理研究所从事量子信息理论研究。在量子测量，量子态层析，量子计算，非局域关联，准概率表示，量子力学基本问题等领域取得了突出成绩，在包括PRL在内的国际知名期刊发表论文20多篇。特别是2016年在物理学权威期刊PRL发表论文3篇，其中两篇为独立作者；同时还应邀在各种研讨会，世界名校以及著名研究机构做报告十几次。

欢迎老师和同学参加！