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题名: Discontinuity and Protection of Quantum Fisher Information for a Two-Qubit System*
作者: Wang, GY;  Yuan, JB;  Zeng, HS
刊名: COMMUNICATIONS IN THEORETICAL PHYSICS
出版日期: 2015
卷号: 64, 期号:5, 页码:495-500
关键词: quantum Fisher information ;  discontinuity ;  protection
学科分类: Physics
通讯作者: Zeng, HS (reprint author), Hunan Normal Univ, Dept Phys, Minist Educ, Key Lab Low Dimens Quantum Structures & Quantum C, Changsha 410081, Hunan, Peoples R China.
文章类型: Article
英文摘要: 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.
类目[WOS]: Physics, Multidisciplinary
关键词[WOS]: METROLOGY ;  STATES
收录类别: SCI
项目资助者: National Natural Science Foundation of China [11275064, 11075050] ;  Specialized Research Fund for the Doctoral Program of Higher Education [20124306110003] ;  Scientific Research Foundation of the Education Department of Hunan Province [13C039] ;  Construct Program of the National Key Discipline
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20802
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
Wang, GY,Yuan, JB,Zeng, HS. Discontinuity and Protection of Quantum Fisher Information for a Two-Qubit System*[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2015,64(5):495-500.
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文件名: Discontinuity and Protection of Quantum Fisher Information for a Two-Qubit System.pdf
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