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Discontinuity and protection of Quantum Fisher Information for a Two-Qubit System

Communications in Theoretical Physics 2015年第11期64卷 495-500页

作者：王国友袁季兵曾浩生 College of Science Hunan University of Technology Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of PhysicsHunan Normal University State Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences

We analytically investigate the dynamics of quantum Fisher information of two qubits in independent environments for both uncorrelated and entangled input states.Especially,we observe that,in the non-Markovian regime and resonant case,quantum Fisher information of uncorrelated input state vanishes only at discrete time point whereas that of entangled input state can disappear during finite time interval.It shows that quantum Fisher information,which determines the parameter estimation precision,is strongly affected by the environment memory effects,and the advantage of entanglement-enhance metrology no longer exists even for a very short time.We also note that quantum Fisher information for two kinds of input states can be preserved under appropriate qubit-reservoir detuning.

关键词： quantum Fisher information discontinuity protectio

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Museum Fun

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Beijing Review 2019年第22期62卷 3-11页

Wildlife protectio n Most Chinese respondents in a recent survey said they would not take part in any activities that may have a negative impact on animals during wildlife tours,China Daily reported on May 21.The survey Found that more than 90 percent of Chinese travelers who had participated in an overseas wildlife tour said they would take into account whether their activities negatively afFected the animals before making future tour decisions.

关键词： Wildlife protectio animals during tour decisions

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Retrospection on China's Legislation for Historic and Cultural City Conservation

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China City Planning Review 2011年第2期20卷 56-64页

作者： ZHANG Song SHI Ke

The article reviews the evolution of China's legislation for the conservation of Historic and Cultural Cities(HCCs),summarizes China's existing laws and regulations of both national and local levels on the conservation of historic and cultural cities,discusses the disadvantages of China's current legal system for the conservation planning and offers some suggestions on how to satisfy the requirements of integrated conservation the historical environment of historic and cultural cities,as well as completing the legal system for urban and rural planning.

关键词： urban and rural planning legislation for protectio

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Factors Influencing Farmers' Willingness to Participate in Plant protection Machinery Subsidies

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Asian Agricultural Research 2013年第4期5卷 26-30页

作者： Linping WANG Liangmei CAI College of Economics and Management Fujian Agriculture and Forestry University College of Plant protection Fujian Agriculture and Forestry University

In order to have an overview of implementation of the subsidy policy for purchase of plant protection machinery in Fujian Province, based on the questionnaire data on Fujian Province, we use Logit model to conduct empirical analysis of factors influencing farmers' willingness to participate in the subsidy policy for purchase of plant protection machinery. Research results show that there are 69.4% of farmers willing to participate in the subsidy policy for purchase of plant protection machinery; farmers' growing area has a significant impact on the willingness to participate in the subsidy policy for purchase of plant protection machinery, and there is negative correlation; educational level, experience in planting, family farming pure income all have a significant positive impact on the willingness to participate in the subsidy policy.

关键词： The subsidy policy for purchase of plant protectio

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