Nature Photonics 4, 302–306 (2010); published online: 7 March 2010; retracted online: 16 October 2012.
In this Letter, we claimed the generation of entangled photons from highly symmetric site-controlled pyramidal quantum dots. Apart from the observation of isotropic emission and the measurement of a vanishing fine-structure splitting of 0 μeV ± 2 μeV, a fidelity of >0.5 was obtained by using the density matrix derived from quantum state tomography of 16 different polarization-resolved correlation measurements. After further investigation of the second-order correlation functions, g(2)(τ), major errors were found and the best fidelity found is now 0.45 for a gate width of 0.225 ns. As a result, we can no longer claim emission of polarization-entangled photons. We therefore wish to retract this Letter and sincerely apologize for any adverse consequence that may have resulted from the paper's publication.
Additional information
The online version of the original article can be found at 10.1038/nphoton.2010.2
About this article
Cite this article
Mohan, A., Felici, M., Gallo, P. et al. Retraction Note: Polarization-entangled photons produced with high-symmetry site-controlled quantum dots. Nature Photon 6, 793 (2012). https://doi.org/10.1038/nphoton.2012.274
Published:
Issue Date:
DOI: https://doi.org/10.1038/nphoton.2012.274