題目：Detecting Coherence via Spectrum Estimation
報告人：于曉東 Research Fellow（University of Siegen） 
時  間：2018年11月15日(周四)上午 9:30
地  點：北京理工大學中心教學樓501

摘要：
Coherence is a basic phenomenon in quantum mechanics and considered to be an essential resource in quantum information processing. Although the quantification of coherence has attracted a lot of interest, the lack of efficient methods to measure the coherence in experiments limits the applications. We address this problem by introducing an experiment-friendly method for coherence and spectrum estimation. This method is based on the theory of majorization and can not only be used to prove the presence of coherence, but also result in a rather precise lower bound of the amount of coherence. As an illustration, we show how to characterize the freezing phenomenon of coherence with only two local measurements for any N-qubit quantum systems. Our approach also has other applications in quantum information processing, such as the characterization of distillability and entanglement transformations.

簡歷：
　　于曉東，2017年畢業于山東大學，理論物理學博士。現工作于德國University of Siegen。主要研究方向為量子理論與量子信息，目前主要從事量子相干性的量化方面的研究。其提出的量子相干性的完全凍結定理以及量子相干性的可加性條件均以Repaid Communications的形式發表于物理學的重要期刊Physical Review A，發表兩年內引用次數已超90次。

聯系方式：物理學院辦公室 （68912131）
邀請人：尚江偉 副研究員
網    址：http://physics.bit.edu.cn/