主持人: 姚道新教授
报告摘要:The precision limit in quantum state tomography is of great interest not only to practical applications but also to foundational studies. However, little is known about this subject in the multiparameter setting due to the subtle information trade-off among incompatible observables. In this talk I will summarize our understanding about this limit with separable measurements as well as entangled measurements. In addition, I will report the first experiment that achieves this precision limit in adaptive quantum state tomography on optical polarisation qubits. Also discussed is the connection between quantum precision limit and several topics of predominantly foundational interest, such as the complementarity principle, measurement uncertainty relations, joint measurement problem, and quantum steering.
朱黄俊博士的简介如下:
Dr. Huangjun Zhu, Ph.D.
B.A. Zhejiang University (2003);M.Sc. Peking University (2007); Ph.D. National University of Singapore (2012); Research assistant, Centre for Quantum Technologies, National University of Singapore, Singapore (Feb 2012 - Oct 2012); Research fellow, Perimeter Institute for Theoretical Physics, Waterloo, ON, Canada (Nov 2012 - Aug 2015); Research affi liate, Institute for Quantum Computing, Waterloo, Canada (Sep 2013 - Aug 2015); Research fellow, Institute for Theoretical Physics, University of Cologne, Cologne, Germany (Sep 2015 - now).
Research interests: Quantum measurements, quantum tomography, quantum metrology, quantum control; Quantum computation; Geometry and symmetry in quantum physics as well as phase space methods; Foundations of quantum physics; Entanglement, steering, and nonlocal correlations; Mathematical physics.
Selected works:
H. Zhu, Permutation Symmetry Determines the Discrete Wigner Function, Phys. Rev. Lett. 116, 040501 (2016, Editors' Suggestion); H. Zhu, Multiqubit Clifford groups are unitary 3-designs http://arxiv.org/abs/1510.02619 ; H. Zhu, Masahito Hayashi, Lin Chen, Universal Steering Criteria, Phys. Rev. Lett. 116, 070403 (2016); H. Zhu, Quasiprobability representations of quantum mechanics with minimal negativity, arXiv:1604.06974 [quant-ph]; H. Zhu, Information complementarity: A new paradigm for decoding quantum incompatibility, Sci. Rep. 5, 14317 (2015); Z.B. Hou, H. Zhu, G.Y. Xiang, C.F. Li, G.C. Guo, Achieving quantum precision limit in adaptive qubit state tomography, npj Quantum Information 2, 16001 (2016).