The theoretical accuracy limit of copying quantum information - such as the direction of polarisation of a single photon - is of five-sixths, or 83 per cent. Bouwmeester is part of a group led by Antia Lamas-Linares at Oxford which reports in Science that they have successfully copied a photons quantum state with 81 per cent accuracy.
http://www.newscientist.com/news/news.jsp?id=ns99992111
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