Towards Long-Distance Atom-Photon Entanglement

被引：49
作者：
Rosenfeld, W. [1 ]
Hocke, F. [1 ]
Henkel, F. [1 ]
Krug, M. [1 ]
Volz, J. [1 ]
Weber, M. [1 ]
Weinfurter, H. [1 ,2 ]
机构：
[1] Univ Munich, Fak Phys, D-80799 Munich, Germany
[2] Max Planck Inst Quantum Opt, D-85748 Garching, Germany
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 26期
关键词：
D O I：
10.1103/PhysRevLett.101.260403
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the observation of entanglement between a single trapped atom and a single photon at remote locations. The degree of coherence of the entangled atom-photon pair is verified via appropriate local correlation measurements, after communicating the photon via an optical fiber link of 300 m length to a receiver 3.5 m apart. In addition, we measured the temporal evolution of the atomic density matrix after projecting the atom via a state measurement of the photon onto several well-defined spin states. We find that the state of the single atom dephases on a time scale of 150 mu s, which represents an important step towards long-distance quantum networking with individual neutral atoms.
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页数：4
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