Towards long-distance atom-photon entanglement

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 len...

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Bibliographic Details
Published in:Physical review letters 2008-12, Vol.101 (26), p.260403-260403, Article 260403
Main Authors: Rosenfeld, W, Hocke, F, Henkel, F, Krug, M, Volz, J, Weber, M, Weinfurter, H
Format: Article
Language:English
Subjects:
ATOMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DENSITY MATRIX
EVOLUTION
OPTICAL FIBERS
PHOTONS
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
SPIN
TRAPPING
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Summary: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 micros, which represents an important step towards long-distance quantum networking with individual neutral atoms.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.101.260403