An Exact Approach to Elimination of Leakage in a Qubit Embedded in a Three-level System

doi:10.1038/s41598-019-47479-9

	An Exact Approach to Elimination of Leakage in a Qubit Embedded in a Three-level System
	Sun, Yifan 1,2,3,4; Zhang, Jun-Yi 3; Wu, Lian-Ao 1,4
刊名	SCIENTIFIC REPORTS
	2019-07-30
卷号	9 页码:8
ISSN号	2045-2322
DOI	10.1038/s41598-019-47479-9
英文摘要	Leakage errors damage a qubit by coupling it to other levels. Over the years, several theoretical approaches to dealing with such errors have been developed based on perturbation arguments. Here we propose a different strategy: we use a sequence of finite rotation gates to exactly eliminate leakage errors. The strategy is illustrated by the recently proposed charge quadrupole qubit in a triple quantum dot, where there are two logical states to encode the qubit and one leakage state. We found an su(2) subalgebra in the three-level system, and by using the subalgebra we show that ideal Pauli x and z rotations, which are universal for single-qubit gates, can be generated by two or three propagators. In addition, the magnitude of detuning fluctuation can be estimated based on the exact solution.
资助项目	Spanish MINECO/FEDER[FIS2015-69983-P] ; Basque Government[IT986-16] ; UPV/EHU[UFI 11/55]
WOS关键词	QUANTUM COMPUTATION ; ELECTRON-SPIN ; FIDELITY ; GATE
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000477858900011
资助机构	Spanish MINECO/FEDER ; Spanish MINECO/FEDER ; Basque Government ; Basque Government ; UPV/EHU ; UPV/EHU ; Spanish MINECO/FEDER ; Spanish MINECO/FEDER ; Basque Government ; Basque Government ; UPV/EHU ; UPV/EHU ; Spanish MINECO/FEDER ; Spanish MINECO/FEDER ; Basque Government ; Basque Government ; UPV/EHU ; UPV/EHU ; Spanish MINECO/FEDER ; Spanish MINECO/FEDER ; Basque Government ; Basque Government ; UPV/EHU ; UPV/EHU
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/14758]
专题	中国科学院武汉物理与数学研究所
通讯作者	Wu, Lian-Ao
作者单位	1.Basque Fdn Sci, Ikerbasque, Bilbao 48011, Spain 2.Beijing Inst Technol, Sch Phys, Beijing Key Lab Nanophoton & Ultrafine Optoelect, Beijing 100081, Peoples R China 3.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Hubei, Peoples R China 4.Basque Country Univ EHU UPV, Dept Theoret Phys & Hist Sci, POB 644, Bilbao 48080, Spain
推荐引用方式 GB/T 7714	Sun, Yifan,Zhang, Jun-Yi,Wu, Lian-Ao. An Exact Approach to Elimination of Leakage in a Qubit Embedded in a Three-level System[J]. SCIENTIFIC REPORTS,2019,9:8.
APA	Sun, Yifan,Zhang, Jun-Yi,&Wu, Lian-Ao.(2019).An Exact Approach to Elimination of Leakage in a Qubit Embedded in a Three-level System.SCIENTIFIC REPORTS,9,8.
MLA	Sun, Yifan,et al."An Exact Approach to Elimination of Leakage in a Qubit Embedded in a Three-level System".SCIENTIFIC REPORTS 9(2019):8.