Black holes are almost optimal quantum cloners. Adami, C. & Ver Steeg, G. L. Journal of Physics A, 2015.
bibtex   
@article{clone,
	Author = {Adami, Christoph and {Ver Steeg}, Greg L.},
	Issue = 23,
	Journal = {Journal of Physics A},
	Title = {{Black holes are almost optimal quantum cloners}},
	Volume = 58,
	Year = {2015}}

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