Observation of Topologically Protected Bound States in Photonic Quantum Walks

Observation of Topologically Protected Bound States in Photonic Quantum Walks

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Observation of Topologically Protected Bound States in Photonic Quantum Walks

dc.contributor.author	Kitagawa, Takuya
dc.contributor.author	Broome, Matthew A.
dc.contributor.author	Fedrizzi, Alessandro
dc.contributor.author	Rudner, Mark S.
dc.contributor.author	Berg, Erez
dc.contributor.author	Kassal, Ivan
dc.contributor.author	Aspuru-Guzik, Alan
dc.contributor.author	Demler, Eugene A.
dc.contributor.author	White, Andrew G.
dc.date.accessioned	2012-06-13T14:00:36Z
dash.embargo.terms	2012-12-07
dc.date.issued	2012
dc.identifier.citation	Kitagawa, Takuya, Matthew A. Broome, Alessandro Fedrizzi, Mark S. Rudner, Erez Berg, Ivan Kassal, Alán Aspuru-Guzik, Eugene Demler and Andrew G. White. 2012. Observation of topologically protected bound states in photonic quantum walks. Nature Communications 3(6): 882.	en_US
dc.identifier.issn	2041-1723	en_US
dc.identifier.uri	http://nrs.harvard.edu/urn-3:HUL.InstRepos:8873146
dc.description.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.	en_US
dc.description.sponsorship	Chemistry and Chemical Biology	en_US
dc.description.sponsorship	Physics	en_US
dc.language.iso	en_US	en_US
dc.publisher	Nature Publishing Group	en_US
dc.relation.isversionof	doi:10.1038/ncomms1872	en_US
dc.relation.hasversion	http://arxiv.org/abs/1105.5334	en_US
dc.relation.hasversion	http://cmt.harvard.edu/demler/PUBLICATIONS/ref149.pdf	en_US
dash.license	LAA
dc.subject	physical sciences	en_US
dc.subject	optical physics	en_US
dc.subject	theoretical physics	en_US
dc.title	Observation of Topologically Protected Bound States in Photonic Quantum Walks	en_US
dc.type	Journal Article	en_US
dc.description.version	Author's Original	en_US
dc.relation.journal	Nature Communications	en_US
dash.depositing.author	Aspuru-Guzik, Alan
dash.waiver	2012-04-22
dc.date.available	2012-12-07T08:30:29Z