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物理学科学术报告(山西大学物理系,李卫东教授)
发布时间: 2018-11-20 浏览次数: 14

【报告题目】Sensitivity Bounds for Ising Interferometry Hamiltonians 

【报人】李卫东,山西大学物理电子工程学院理论物理研究所

【报告时间】2018年11月22日(周四)上午10:00

【报告地点】科技楼29-414

【报告摘要】

Sensitivity bounds for a generic interferometric phase estimation problem are the shot noise and the Heisenberg limit. The shot noise is the highest sensitivity that can be reached with separables states, while the Heisenberglimit is the ultimate bound in sensitivity which can be saturated with entangled states. The scaling of thesebounds with the number of particles N entering the interferometer depends on the specific Hamiltonian governingthe same interferometer. In typical cases, the Hamiltonian is linear, and the shot noise and the Heisenberg limits scale with N^{-1/2} and with N^{-1}, respectively. With interferometers described by generic, non linearHamiltonian, the scalings with the number of particles can be rather different. Here we study the shot noiseand the Heisenberg limit of Ising-like Hamiltonians in presence of longitudinal and transverse fields, both in thenearest-neighbours and in the fully connected spin interactions cases. We provide the explicit forms of the statessaturating the shot-noise and the Heisenberg limit. These results can be relevant not only for precision measurementpurposes but also for to characterize phase transitions and, more generally, the witnessing of multipartiteentanglement.

【邀请人】高先龙

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