Preservation of entanglement in a two-qubit-spin coupled system

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	Preservation of entanglement in a two-qubit-spin coupled system
	Hou, YC ; Zhang, GF ; Chen, Y ; Fan, H
刊名	ANNALS OF PHYSICS
	2012
卷号	327 期号:2 页码:292
关键词	ANISOTROPIC SUPEREXCHANGE INTERACTION QUANTUM COMPUTATION WEAK FERROMAGNETISM DECOHERENCE DOTS
ISSN号	0003-4916
通讯作者	Zhang, GF (reprint author), Beihang Univ, Sch Phys & Nucl Energy Engn, Xueyuan Rd 37, Beijing 100191, Peoples R China.
中文摘要	The newly discovered alkali-doped iron selenide superconductors(1,2) not only reach a superconducting transition temperature as high as 32 K, but also exhibit unique characteristics that are absent from other iron-based superconductors, such as antiferromagnetically ordered insulating phases(3,4), extremely high Neel transition temperatures(5,6) and the presence of Fe vacancies and ordering(7-10). These features have generated considerable excitement as well as confusion, regarding the delicate interplay between Fe vacancies, magnetism and superconductivity(11-13). Here we report on molecular beam epitaxy growth of high-quality KxFe2-ySe2 thin films and in situ low-temperature scanning tunnelling microscope measurement of their atomic and electronic structures. We demonstrate that a KxFe2-ySe2 sample contains two distinct phases: an insulating phase with well-defined root 5 x root 5 order of Fe vacancies, and a superconducting KFe2Se2 phase containing no Fe vacancies. An individual Fe vacancy can locally destroy superconductivity in a similar way to a magnetic impurity in conventional superconductors. Measurement of the magnetic-field dependence of the Fe-vacancy-induced bound states reveals a magnetically related bipartite order in the tetragonal iron lattice. These findings elucidate the existing controversies on this new superconductor and provide atomistic information on the interplay between magnetism and superconductivity in iron-based superconductors.
收录类别	SCI
资助信息	National Science Foundation of China [10874013, 11174024, 10974247]
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/51379]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Hou, YC,Zhang, GF,Chen, Y,et al. Preservation of entanglement in a two-qubit-spin coupled system[J]. ANNALS OF PHYSICS,2012,327(2):292.
APA	Hou, YC,Zhang, GF,Chen, Y,&Fan, H.(2012).Preservation of entanglement in a two-qubit-spin coupled system.ANNALS OF PHYSICS,327(2),292.
MLA	Hou, YC,et al."Preservation of entanglement in a two-qubit-spin coupled system".ANNALS OF PHYSICS 327.2(2012):292.