Irreversibility of a quantum walk induced by controllable decoherence employing random unitary operations

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 原子分子光物理研究部

	Irreversibility of a quantum walk induced by controllable decoherence employing random unitary operations
	Xu You-Yang 1; Zhou Fei 2; Chen Liang 2; Xie Yi 2,3; Xue Peng 4; Feng Mang 2
刊名	CHINESE PHYSICS B
	2012-04-01
卷号	21 期号:4
关键词	quantum walk irreversibility trapped ions average fidelity decay
英文摘要	Quantum walk is different from random walk in reversibility and interference. Observation of the reduced reversibility in a realistic quantum walk is of scientific interest in understanding the unique quantum behavior. We propose an idea to experimentally investigate the decoherence-induced irreversibility of quantum walks with trapped ions in phase space via the average fidelity decay. By introducing two controllable decoherence sources, i.e., the phase damping channel (i.e., dephasing) and the high temperature amplitude reservoir (i.e., dissipation), in the intervals between the steps of quantum walk, we find that the high temperature amplitude reservoir shows more detrimental effects than the phase damping channel on quantum walks. Our study also shows that the average fidelity decay works better than the position variance for characterizing the transition from quantum walks to random walk. Experimental feasibility to monitor the irreversibility is justified using currently available techniques.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	TRAPPED IONS ; GATES ; ATOMS
收录类别	SCI
语种	英语
WOS记录号	WOS:000302790300009
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/1626]
专题	武汉物理与数学研究所_原子分子光物理研究部
作者单位	1.Kunming Univ Sci & Technol, Fac Sci, Kunming 650093, Peoples R China 2.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 4.Southeast Univ, Dept Phys, Nanjing 211189, Peoples R China
推荐引用方式 GB/T 7714	Xu You-Yang,Zhou Fei,Chen Liang,et al. Irreversibility of a quantum walk induced by controllable decoherence employing random unitary operations[J]. CHINESE PHYSICS B,2012,21(4).
APA	Xu You-Yang,Zhou Fei,Chen Liang,Xie Yi,Xue Peng,&Feng Mang.(2012).Irreversibility of a quantum walk induced by controllable decoherence employing random unitary operations.CHINESE PHYSICS B,21(4).
MLA	Xu You-Yang,et al."Irreversibility of a quantum walk induced by controllable decoherence employing random unitary operations".CHINESE PHYSICS B 21.4(2012).