Combating dephasing decoherence by periodically performing tracking control and projective measurement

doi:10.1103/PhysRevA.76.042335

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	Combating dephasing decoherence by periodically performing tracking control and projective measurement
	Zhang, Ming 1,2; Dai, Hong Yi 3; Xi, Zairong 2; Xie, Hong Wei 1; Hu, Dewen 1
	2007-10-01
发表期刊	PHYSICAL REVIEW A
ISSN	1050-2947
卷号	76 期号:4 页码:7
摘要	We propose a scheme to overcome phase damping decoherence by periodically performing open loop tracking control and projective measurement. Although it is impossible to stabilize a qubit subject to Markovian dynamics only by open loop coherent control, one can attain a "softened" control goal with the help of periodical projective measurement. The "softened" control objective in our scheme is to keep the state of the controlled qubit to stay near a reference pure state with a high probability for a sufficiently long time. Two suboptimal control problems are given in the sense of trace distance and fidelity, respectively, and they are eventually reduced to the design of a period T. In our scheme, one can choose the period T as long as possible if the "softened" control goal is attained. This is in contrast to the observation that quantum Zeno effect takes place only if measurements are performed in a very frequent manner, i.e., the period T must be extremely small.
DOI	10.1103/PhysRevA.76.042335
语种	英语
WOS研究方向	Optics ; Physics
WOS类目	Optics ; Physics, Atomic, Molecular & Chemical
WOS记录号	WOS:000250619700078
出版者	AMER PHYSICAL SOC
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/4289
专题	中国科学院数学与系统科学研究院
通讯作者	Zhang, Ming
作者单位	1.Natl Univ Def Technol, Coll Mechatron & Automat, Changsha 410073, Peoples R China 2.Chinese Acad Sci, Key Lab Syst & Control, Beijing 100080, Peoples R China 3.Natl Univ Def Technol, Coll Sci, Changsha 410073, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Ming,Dai, Hong Yi,Xi, Zairong,et al. Combating dephasing decoherence by periodically performing tracking control and projective measurement[J]. PHYSICAL REVIEW A,2007,76(4):7.
APA	Zhang, Ming,Dai, Hong Yi,Xi, Zairong,Xie, Hong Wei,&Hu, Dewen.(2007).Combating dephasing decoherence by periodically performing tracking control and projective measurement.PHYSICAL REVIEW A,76(4),7.
MLA	Zhang, Ming,et al."Combating dephasing decoherence by periodically performing tracking control and projective measurement".PHYSICAL REVIEW A 76.4(2007):7.