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题名: Single-spin manipulation in a double quantum dot in the field of a micromagnet
作者: Chesi, S ;  Wang, YD ;  Yoneda, J ;  Otsuka, T ;  Tarucha, S ;  Loss, D
刊名: PHYSICAL REVIEW B
出版日期: 2014
卷号: 90, 期号:23, 页码:235311
关键词: ELECTRON SPINS ;  COMPUTATION ;  QUBIT
学科分类: Physics
DOI: 10.1103/PhysRevB.90.235311
通讯作者: Chesi, S (reprint author), Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China.
部门归属: [Chesi, Stefano] Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China
英文摘要: The manipulation of single spins in double quantum dots by making use of the exchange interaction and a highly inhomogeneous magnetic field was discussed in Coish and Loss [Phys. Rev. B 75, 161302 (2007)]. However, such large inhomogeneity is difficult to achieve through the slanting field of a micromagnet in current designs of lateral double dots. Therefore, we examine an analogous spin manipulation scheme directly applicable to realistic GaAs double dot setups. We estimate that typical gate times, realized at the singlet-triplet anticrossing induced by the inhomogeneous micromagnet field, can be a few nanoseconds. We discuss the optimization of initialization, read-out, and single-spin gates through suitable choices of detuning pulses and an improved geometry. We also examine the effect of nuclear dephasing and charge noise. The latter induces fluctuations of both detuning and tunneling amplitude. Our results suggest that this scheme is a promising approach for the realization of fast single-spin operations.
资助者: IARPA project "Multi-Qubit Coherent Operations" through Copenhagen University; 1000 Youth Fellowship Program of China; ImPACT Program of Council for Science Technology and Innovation (Cabinet Office, Government of Japan); FIRST; Japan Prize Foundation; JSPS; RIKEN incentive project; Yazaki Memorial Foundation; Swiss NSF; NCCR QSIT; [26220710]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000346377400002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15539
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
Chesi, S,Wang, YD,Yoneda, J,et al. Single-spin manipulation in a double quantum dot in the field of a micromagnet[J]. PHYSICAL REVIEW B,2014,90(23):235311.
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