Abstract
To make photonic quantum information a reality1,2, a number of extraordinary challenges need to be overcome. One challenge is to achieve large arrays of reproducible ‘entangled’ photon generators, while maintaining compatibility for integration with optical devices and detectors3,4,5. Semiconductor quantum dots are potentially ideal for this as they allow photons to be generated on demand6,7 without relying on probabilistic processes8,9. Nevertheless, most quantum-dot systems are limited by their intrinsic lack of symmetry, which allows only a small number (typically 1 out of 100, or worse) of good dots to be achieved per chip. The recent retraction of Mohan et al.10 seemed to question the very possibility of simultaneously achieving site control and high symmetry. Here, we show that with a new family of (111)-grown pyramidal site-controlled InGaAs1–δNδ quantum dots it is possible to overcome previous hurdles and obtain areas with up to 15% of polarization-entangled photon emitters, with fidelities as high as 0.721 ± 0.043.
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Acknowledgements
This research was partly enabled by the Irish Higher Education Authority Program for Research in Third Level Institutions (2007-2011) via the INSPIRE programme, by Science Foundation Ireland (grants 05/IN.1/I25, 10/IN.1/I3000 and 08/RFP/MTR/1659) and EU FP7 under the Marie Curie Reintegration Grant (PERG07-GA-2010-268300). We thank K. Thomas for his support with the MOVPE system and R.J. Young for his essential help in setting up the correlation setup in the early stages of this project.
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G.J. carried out optical characterization of the samples and data analysis, and wrote the manuscript with E.P. L.O.M. assisted in optical characterization and data analysis. V.D. and A.G. participated in the production of the samples, processing and microscopy characterization. E.P. conceived the study, participated in its design and coordination, and contributed to writing the manuscript. All authors commented on the final manuscript.
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Juska, G., Dimastrodonato, V., Mereni, L. et al. Towards quantum-dot arrays of entangled photon emitters. Nature Photon 7, 527–531 (2013). https://doi.org/10.1038/nphoton.2013.128
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DOI: https://doi.org/10.1038/nphoton.2013.128
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