Observation of Topologically Protected Edge States in a Photonic Two-Dimensional Quantum Walk

被引：97

作者：

Chen, Chao ^{[1
,2
,3
]}

Ding, Xing ^{[1
,2
,3
]}

Qin, Jian ^{[1
,2
,3
]}

He, Yu ^{[1
,2
,3
]}

Luo, Yi-Han ^{[1
,2
,3
]}

Chen, Ming-Cheng ^{[1
,2
,3
]}

Liu, Chang ^{[1
,2
,3
]}

Wang, Xi-Lin ^{[4
]}

Zhang, Wei-Jun ^{[4
]}

Li, Hao ^{[4
]}

You, Li-Xing ^{[4
]}

Wang, Zhen ^{[4
]}

Wang, Da-Wei ^{[5
]}

Sanders, Barry C. ^{[1
,2
,3
,6
,7
]}

Lu, Chao-Yang ^{[1
,2
,3
]}

Pan, Jian-Wei ^{[1
,2
,3
]}

机构：

[1] Univ Sci & Technol China, Shanghai Branch, Hefei Natl Lab Phys Sci Microscale, Shanghai 201315, Peoples R China

[2] Univ Sci & Technol China, Shanghai Branch, Dept Modem Phys, Shanghai 201315, Peoples R China

[3] CAS Ctr Excellence Quantum Informat & Quantum Phy, CAS Alibaba Quantum Comp Lab, Shanghai 201315, Peoples R China

[4] SIMIT, State Key Lab Funct Mat Informat, Shanghai, Peoples R China

[5] Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China

[6] Univ Calgary, Inst Quantum Sci & Technol, Calgary, AB T2N 1N4, Canada

[7] Canadian Inst Adv Res, Program Quantum Informat Sci, Toronto, ON M5G 1Z8, Canada

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 10期

基金：

中国国家自然科学基金;

关键词：

INSULATORS; DYNAMICS; PHYSICS; PHASES;

D O I：

10.1103/PhysRevLett.121.100502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Periodically driven systems have displayed a variety of fascinating phenomena without analogies in static systems, which enrich the classification of quantum phases of matter and stimulate a wide range of research interests. Here, we employ discrete-time quantum walks to investigate a nontrivial topological effect unique to a two-dimensional periodically driven system: chiral edge states can exist at the interface of Floquet insulators whose Chern numbers vanish. Thanks to a resource-saving and flexible fiber-loop architecture, we realize inhomogeneous two-dimensional quantum walks up to 25 steps, over an effective 51 x 51 lattice with tunable local parameters. Spin-polarized chiral edge states are observed at the boundary of two distinct quantum walk domains. Our results contribute to establishing a well-controlled platform for exploring nontrivial topological phases.

引用

页数：6

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