Topologically protected entangled photonic states

Michelle Wang, Cooper Doyle, Bryn Bell, Matthew J. Collins, Eric Magi, Benjamin J. Eggleton, Mordechai Segev, Andrea Blanco-Redondo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)
19 Downloads (Pure)


Entangled multiphoton states lie at the heart of quantum information, computing, and communications. In recent years, topology has risen as a new avenue to robustly transport quantum states in the presence of fabrication defects, disorder, and other noise sources. Whereas topological protection of single photons and correlated photons has been recently demonstrated experimentally, the observation of topologically protected entangled states has thus far remained elusive. Here, we experimentally demonstrate the topological protection of spatially entangled biphoton states. We observe robustness in crucial features of the topological biphoton correlation map in the presence of deliberately introduced disorder in the silicon nanophotonic structure, in contrast with the lack of robustness in non-topological structures. The topological protection is shown to ensure the coherent propagation of the entangled topological modes, which may lead to robust propagation of quantum information in disordered systems.

Original languageEnglish
Pages (from-to)1327-1335
Number of pages9
Issue number8
Publication statusPublished - Aug 2019

Bibliographical note

Copyright 2019 Andrea Blanco-Redondo et al., published by De Gruyter. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


  • topological photonics
  • entanglement
  • nanophotonics
  • silicon photonics


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