In this talk I will give a purely quantum information perspective for the Island formula. More explicitly we show that, in a quantum system when the state of a subset is totally encoded in the state of another subset, the Hilbert space of the system will reduce, and the way we compute the reduced density matrix and related entropy quantities will also change essentially. Such reductions of the Hilbert space result in a new island formula in quantum systems, which we conjecture to be the same island formula in gravity recently proposed to rescue the unitarity for black hole evaporation. Furthermore, we propose a non-gravitational field theory configuration where entanglement islands emerge, give a description for the entanglement structure of the island phase and propose how to realize the island phase in the lab.

报告人简介：文强2015年博士毕业于中国人民大学物理系，之后在清华大学数学中心做博士后研究，期间做过哈佛大学以及工程物理研究员研究生院的访问学者，2018年底入职东南大学丘成桐中心副教授。文强的近年主要研究渐进非AdS时空的全息纠缠熵以及其几何图像，并提出量子信息中一个新的概念，部分纠缠熵（partial entanglement entropy），以及它的全息描述。

联系人：吴洁强