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Science 26 September 2008:
Vol. 321. no. 5897, pp. 1783 - 1784
DOI: 10.1126/science.1164543
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Perspectives

PHYSICS:
For Quantum Information, Two Wrongs Can Make a Right

Jonathan Oppenheim

A channel too noisy to send quantum information can send secret messages, and, when combined with a similarly noisy channel, can reliably send quantum states.

Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA, UK. E-mail: jono{at}damtp.cam.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)