Original press release from the University of Sussex: <a href="http://www.sussex.ac.uk/newsandevents/?id=21417" rel="nofollow">http://www.sussex.ac.uk/newsandevents/?id=21417</a><p>Original journal article: <a href="http://www.sussex.ac.uk/physics/iqt/PhysRevLett111140501.pdf" rel="nofollow">http://www.sussex.ac.uk/physics/iqt/PhysRevLett111140501.pdf</a><p>Article at Physical Review Letters (where it's being published): <a href="http://prl.aps.org/abstract/PRL/v111/i14/e140501" rel="nofollow">http://prl.aps.org/abstract/PRL/v111/i14/e140501</a><p>Website of research group responsible: <a href="http://www.sussex.ac.uk/physics/iqt/" rel="nofollow">http://www.sussex.ac.uk/physics/iqt/</a>