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主題：Emergent classicality in general multipartite states and channels
主講人：祁曉亮
單位：Stanford University
In a quantum measurement process, classical information about the measured system spreads throughout the environment. Meanwhile, quantum information about the system becomes inaccessible to local observers. Here we prove a result about quantum channels indicating that an aspect of this phenomenon is completely general. We show that for any evolution of the system and environment, for everywhere in the environment excluding an O(1)-sized region we call the "quantum Markov blanket," any locally accessible information about the system must be approximately classical, i.e. obtainable from some fixed measurement. The result strengthens the earlier result of Brand~ao et al. in which the excluded region was allowed to grow with total environment size. It may also be seen as a new consequence of the principles of nocloning or monogamy of entanglement. Our proof offers a constructive optimization procedure for determining the "quantum Markov blanket" region, as well as the effective measurement induced by the evolution. Alternatively, under channel-state duality, our result characterizes the marginals of multipartite states.
祁曉亮，16歲考入清華大學基礎科學班。2003年本科畢業後，師從清華大學高等研究中心翁徵宇教授攻讀博士學位，畢業後到美國史丹福大學物理系張守晟教授處做博士後研究。2009年，任教史丹福大學物理系。他的主要研究方向為凝聚態物理中的拓撲現象、量子糾纏和全息對偶問題，在量子自旋霍爾效應、拓撲絕緣體及相關領域作出一系列原創性工作。已在Science、Nature Physics、PRL等刊物上發表多篇論文。
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