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Originally published in Science Express on 5 April 2007
Science 1 June 2007:
Vol. 316. no. 5829, pp. 1316 - 1320
DOI: 10.1126/science.1140300
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Reports

Functional Quantum Nodes for Entanglement Distribution over Scalable Quantum Networks

Chin-Wen Chou, Julien Laurat, Hui Deng, Kyung Soo Choi, Hugues de Riedmatten,* Daniel Felinto,{dagger} H. Jeff Kimble{ddagger}

We demonstrated entanglement distribution between two remote quantum nodes located 3 meters apart. This distribution involves the asynchronous preparation of two pairs of atomic memories and the coherent mapping of stored atomic states into light fields in an effective state of near-maximum polarization entanglement. Entanglement is verified by way of the measured violation of a Bell inequality, and it can be used for communication protocols such as quantum cryptography. The demonstrated quantum nodes and channels can be used as segments of a quantum repeater, providing an essential tool for robust long-distance quantum communication.

Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, CA 91125, USA.

* Present address: Group of Applied Physics, University of Geneva, Geneva 1211, Switzerland.

{dagger} Present address: Departamento de Física, Universidade Federal de Pernambuco, Recife-PE, 50670-901, Brazil.

{ddagger} To whom correspondence should be addressed. E-mail: hjkimble{at}caltech.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Characterization of Multipartite Entanglement for One Photon Shared Among Four Optical Modes.
S. B. Papp, K. S. Choi, H. Deng, P. Lougovski, S. J. van Enk, and H. J. Kimble (2009)
Science 324, 764-768
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