From: Jan Panteltje on
26th Chaos Communication Congress: How you can build an eavesdropper for a quantum cryptosystem
http://events.ccc.de/congress/2009/Fahrplan/events/3576.en.html

Related article in German:
http://www.heise.de/newsticker/meldung/26C3-Forscher-demonstrieren-genialen-Quanten-Hack-894136.html