QuReP News
Storage of entanged photons in a crystal
We have demonstrated that photons from entangled pairs can be stored in one of our quantum memories without losing the entanglement. This proves experimentally that the atomic frequency comb storage protocol developed at the GAP-Optique is indeed suited for the use in quantum repeaters. The results have now been published in Nature [1].
The results of the experiment are threefold. It demonstrates, for the first time, the successful storage of heralded single photons in a solid-state memory with storage-and-retrieval efficiencies surpassing 20% for the shortest storage time of 25ns. Additionally, we show that the non-classical nature of the intensity correlations between two photons in a pair are preserved after the storage and retrieval process, with storage times up to 200ns. Finally, a violation of a Bell inequality by more than three standard deviations proves that the storage process creates a light-matter entangled state. These results represent the first successful mapping of energy-time entangled photons onto a quantum memory, and we note that the intrinsic multimode capability makes the AFC perfectly suitable for storing this kind of entanglement.
1. C. Clausen et al., Nature Online (2011)
Also in the media:
An article (including comments by Mikael Afzelius and Wolfgang Tittel) in Physics World: Quantum communications boosted by solid memory devices
An article in New Scientist: Ethereal quantum state stored in solid crystalFor further news, see our Press pageProf. Christine Silberhorn receives Gottfried Wilhelm Leibniz Prize
Prof. Christine Silberhorn, from QuReP partner Universität Paderborn, received the prestigious Gottfried Wilhelm Leibniz Prize. Prof. Silberhorn has recently taken over from Prof. Wolfgang Sohler as leader of the integrated quantum optics group in the Department of Physics in Paderborn.
QuReP Scholarship winners!
The QuReP consortium would like to conratulate the two winners of our scholarships to attend the third Winter School on Practical Quantum Cryptography in January 2011 in the Swiss Alps.
Alessio Avella - Università degli Studi di Torino
Sergii Strelchuk - University of Cambridge
We wish you a great and productive time at this, the 3rd Winter School on Practical Quantum Cryptography.
From Quantum Foundations to Quantum Technologies - Challenges for Europe
QuReP members, Rob Thew (University of Geneva) and Grégoire Ribordy (ID Quantique) will be attending this European Workshop “From Quantum Foundations to Quantum Technologies - Challenges for Europe” In Vienna.
Wednesday, December 15, 2010
Location: Kuppelsaal, Vienna University of Technology (TU Wien), Karlsplatz 13, 4th floor, 1040 Vienna
For more information click here
QuReP in Lund: End of of Year 1 Meeting
QuReP held its end of year 1 meeting in Lund on the 29th of November. In what is fast becoming a tradition, the meeting was held during some of the most severe weather conditions possible with snow, once again, doing everything it could to disrupt the meeting and everyone's arrival - see the photo below of a few of the dedicated QuReP researchers (L-R: Mikale Afzelius, Nicolas Sangoaurd, Philippe Goldner, Thierry Chanelière, Félix Bussières and Harald Hermann) preparing for an early morning departure after our meeting.
Funded through the 