[nature]Towards high-speed optical quantum memories

发布者：系统管理员发布时间：2010-04-20浏览次数：2751

黄治摘自于Nature Photonics

篇名： Towards high-speed optical quantum memories
刊名： Nature Photonics
ISSN： 1749-4885
卷期： 4 卷 4 期 出版日期： 20100400
页码： 从 218 页到 221 页共 4 页
doi： 10.1038/nphoton.2010.30
作者：
Reim,K. F.   Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
 
Nunn,J.   Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
 
Lorenz,V. O.   [1] Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK [2] Department of Physics, University of Delaware, Newark, Delaware 19716, USA
 
Sussman,B. J.   [1] Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK [2] National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
 
Lee,K. C.   Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
 
Langford,N. K.   Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
 
Jaksch,D.   Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
 
Walmsley,I. A.   Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
 
文摘： Quantum memories, capable of controllably storing and releasing a photon, are a crucial component for quantum computers and quantum communications. To date, quantum memories have operated with bandwidths that limit data rates to megahertz. Here we report the coherent storage and retrieval of sub-nanosecond low-intensity light pulses with spectral bandwidths exceeding 1 GHz in caesium vapour. The novel memory interaction takes place through a far off-resonant two-photon transition in which the memory bandwidth is dynamically generated by a strong control field. This should allow data rates more than 100 times greater than those of existing quantum memories. The memory works with a total efficiency of 15%, and its coherence is demonstrated through direct interference of the stored and retrieved pulses. Coherence times in hot atomic vapours are on the order of microseconds, the expected storage time limit for this memory.

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