Observation of topologically protected bound states in photonic quantum walks

Kitagawa, Takuya, Broome, Matthew A., Fedrizzi, Alessandro, Rudner, Mark S., Berg, Erez, Kassal, Ivan, Aspuru-Guzik, Alan, Demler, Eugene and White, Andrew G. (2012) Observation of topologically protected bound states in photonic quantum walks. Nature Communications, 3 . doi:10.1038/ncomms1872

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Author Kitagawa, Takuya
Broome, Matthew A.
Fedrizzi, Alessandro
Rudner, Mark S.
Berg, Erez
Kassal, Ivan
Aspuru-Guzik, Alan
Demler, Eugene
White, Andrew G.
Title Observation of topologically protected bound states in photonic quantum walks
Journal name Nature Communications   Check publisher's open access policy
ISSN 2041-1723
Publication date 2012-06
Sub-type Article (original research)
DOI 10.1038/ncomms1872
Open Access Status File (Publisher version)
Volume 3
Total pages 7
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2013
Language eng
Abstract Topological phases exhibit some of the most striking phenomena in modern physics. Much of the rich behaviour of quantum Hall systems, topological insulators, and topological superconductors can be traced to the existence of robust bound states at interfaces between different topological phases. This robustness has applications in metrology and holds promise for future uses in quantum computing. Engineered quantum systems—notably in photonics, where wavefunctions can be observed directly—provide versatile platforms for creating and probing a variety of topological phases. Here we use photonic quantum walks to observe bound states between systems with different bulk topological properties and demonstrate their robustness to perturbations—a signature of topological protection. Although such bound states are usually discussed for static (time-independent) systems, here we demonstrate their existence in an explicitly time-dependent situation. Moreover, we discover a new phenomenon: a topologically protected pair of bound states unique to periodically driven systems.
Keyword Insulator
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2013 Collection
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Citation counts: TR Web of Science Citation Count  Cited 117 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 123 times in Scopus Article | Citations
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Created: Fri, 17 Aug 2012, 19:14:04 EST by System User on behalf of Engineered Quantum Systems