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

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	Discontinuity and Protection of Quantum Fisher Information for a Two-Qubit System*
	Wang, GY; Yuan, JB; Zeng, HS
刊名	COMMUNICATIONS IN THEORETICAL PHYSICS
	2015
卷号	64 期号:5 页码:495-500
关键词	quantum Fisher information discontinuity protection
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.
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.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
关键词[WOS]	METROLOGY ; STATES
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/20802]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	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.
APA	Wang, GY,Yuan, JB,&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.