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Wang, GY; Yuan, JB; Zeng, HS; 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.
Discontinuity and Protection of Quantum Fisher Information for a Two-Qubit System*
Source PublicationCOMMUNICATIONS IN THEORETICAL PHYSICS
Language英语
KeywordQuantum Fisher Information Discontinuity Protection
AbstractWe 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.
2015
Volume64Issue:5Pages:495-500
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China [11275064, 11075050] ; National Natural Science Foundation of China [11275064, 11075050] ; National Natural Science Foundation of China [11275064, 11075050] ; National Natural Science Foundation of China [11275064, 11075050] ; Specialized Research Fund for the Doctoral Program of Higher Education [20124306110003] ; Specialized Research Fund for the Doctoral Program of Higher Education [20124306110003] ; Specialized Research Fund for the Doctoral Program of Higher Education [20124306110003] ; Specialized Research Fund for the Doctoral Program of Higher Education [20124306110003] ; Scientific Research Foundation of the Education Department of Hunan Province [13C039] ; Scientific Research Foundation of the Education Department of Hunan Province [13C039] ; Scientific Research Foundation of the Education Department of Hunan Province [13C039] ; Scientific Research Foundation of the Education Department of Hunan Province [13C039] ; Construct Program of the National Key Discipline ; Construct Program of the National Key Discipline ; Construct Program of the National Key Discipline ; Construct Program of the National Key Discipline
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/20802
Collection理论物理所科研产出_SCI论文
Corresponding AuthorZeng, HS (reprint author), Hunan Normal Univ, Dept Phys, Minist Educ, Key Lab Low Dimens Quantum Structures & Quantum C, Changsha 410081, Hunan, Peoples R China.
Recommended Citation
GB/T 7714
Wang, GY,Yuan, JB,Zeng, HS,et al. Discontinuity and Protection of Quantum Fisher Information for a Two-Qubit System*[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2015,64(5):495-500.
APA Wang, GY,Yuan, JB,Zeng, HS,&Zeng, HS .(2015).Discontinuity and Protection of Quantum Fisher Information for a Two-Qubit System*.COMMUNICATIONS IN THEORETICAL PHYSICS,64(5),495-500.
MLA Wang, GY,et al."Discontinuity and Protection of Quantum Fisher Information for a Two-Qubit System*".COMMUNICATIONS IN THEORETICAL PHYSICS 64.5(2015):495-500.
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