Classical and quantum control of a simple quantum system

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	Classical and quantum control of a simple quantum system
	Xi, Zairong; Jin, Guangsheng 2
	2007-12-01
发表期刊	INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
ISSN	0219-7499
卷号	5 期号:6 页码:857-884
摘要	A qubit which is prepared in one of two non-orthogonal states and subjected to bit. flipping noise is considered. The objective is to use measurement and feedback control to correct the state of the qubit. Three classical schemes using projective measurements, i. e. discrimination and re-preparation, do nothing and random preparation, have been discussed, and are not optimal with respect to a performance which is quantified by the average fidelity of the corrected state compared to the initial state. In addition, one quantum scheme using a non-projective measurement with an optimum measurement strength achieves the best trade-off between gaining information about the system and disturbing it through measurement back-action. The performance of a quantum control scheme outperforms the classical schemes. Furthermore, no universal corrected scheme is discussed.
关键词	quantum control quantum information quantum channel bit-flipping noise quantum communication classical control
语种	英语
WOS研究方向	Computer Science ; Physics
WOS类目	Computer Science, Theory & Methods ; Physics, Particles & Fields ; Physics, Mathematical
WOS记录号	WOS:000252194300008
出版者	WORLD SCIENTIFIC PUBL CO PTE LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/4250
专题	系统科学研究所
通讯作者	Xi, Zairong
作者单位	1.Acad Math & Syst Sci, Inst Syst Sci, Key Lab Syst & Control, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Xi, Zairong,Jin, Guangsheng. Classical and quantum control of a simple quantum system[J]. INTERNATIONAL JOURNAL OF QUANTUM INFORMATION,2007,5(6):857-884.
APA	Xi, Zairong,&Jin, Guangsheng.(2007).Classical and quantum control of a simple quantum system.INTERNATIONAL JOURNAL OF QUANTUM INFORMATION,5(6),857-884.
MLA	Xi, Zairong,et al."Classical and quantum control of a simple quantum system".INTERNATIONAL JOURNAL OF QUANTUM INFORMATION 5.6(2007):857-884.