Front. Phys. Frontiers in Physics Front. Phys. 2296-424X Frontiers Media S.A. 10.3389/fphy.2017.00015 Physics Retraction Retraction: Efficient Concentration Protocols for the Single-Photon Entanglement State with Polarization Feature Frontiers Editorial Office *

Approved by: Lorenzo Pavesi, University of Trento, Italy

*Correspondence: Frontiers Editorial Office editorial.office@frontiersin.org

This article was submitted to Optics and Photonics, a section of the journal Frontiers in Physics

 09 05 2017 2017 5 15 02 05 2017 03 05 2017 Copyright © 2017 Frontiers Editorial Office. 2017 Frontiers Editorial Office

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 A retraction of the Original Research Article Efficient Concentration Protocols for the Single-Photon Entanglement State with Polarization Feature by Zhou, L., Wang, D.-D., Wang, X.-F., Gu, S.-P., and Sheng, Y.-B. (2017). Front. Phys. 5:9. doi: 10.3389/fphy.2017.00009

The Journal and Authors retract the 10 March 2017 article cited above for the following reasons provided by the authors:

Following publication, the authors realized a fundamental conceptual error in the article's equations. This error extends from Equations (3)–(5) and negates the derivations of the equations and descriptions in the article. The Journal and Chief Editors concur that the reasons for retraction are valid and warranted.