| Original language | English |
|---|---|
| Pages (from-to) | 185-188 |
| Number of pages | 4 |
| Journal | Nature |
| Volume | 476 |
| Issue number | 7359 |
| DOIs | |
| State | Published - 10 Aug 2011 |
| Externally published | Yes |
Bibliographical note
Funding Information:Acknowledgements Technical help with the microwave set-up by T. F. Gloger is acknowledged. We acknowledge support by the Bundesministerium für Bildung und Forschung (FK 01BQ1012 and P3352014), the Deutsche Forschungsgemeinschaft, the European Commission under the STREP PICC, the German-Israeli Foundation, secunet AG and the Alexander von Humboldt Foundation.