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Science 23 October 1998:
Vol. 282. no. 5389, pp. 706 - 709
DOI: 10.1126/science.282.5389.706
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Research Articles

Unconditional Quantum Teleportation

A. Furusawa, J. L. Sørensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, * E. S. Polzik

Quantum teleportation of optical coherent states was demonstrated experimentally using squeezed-state entanglement. The quantum nature of the achieved teleportation was verified by the experimentally determined fidelity Fexp = 0.58 ± 0.02, which describes the match between input and output states. A fidelity greater than 0.5 is not possible for coherent states without the use of entanglement. This is the first realization of unconditional quantum teleportation where every state entering the device is actually teleported.

A. Furusawa, C. A. Fuchs, and H. J. Kimble are in the Norman Bridge Laboratory of Physics, California Institute of Technology, Pasadena, CA 91125, USA. J. L. Sørensen and E. S. Polzik are at the Institute of Physics and Astronomy, Aarhus University, Aarhus 8000, Denmark. S. L. Braunstein is at the School of Electrical Engineering and Computer Systems, University of Wales, Bangor LL57 1UT, UK.
*   To whom correspondence should be addressed. E-mail: hjkimble{at}cco.caltech.edu

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