arXiv:1205.2024quant-ph
Quantum teleportation and entanglement distribution over 100-kilometre free-space channels
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Abstract
A long standing goal for quantum communication is to transfer a quantum state over arbitrary distances. Free-space quantum communication provides a promising solution towards this challenging goal. Here, through a 97-km free space channel, we demonstrate long distance quantum teleportation over a 35-53 dB loss one-link channel, and entanglement distribution over a 66-85 dB high-loss two-link channel. We achieve an average fidelity of {80.4(9)}% for teleporting six distinct initial states and observe the violation of the Clauser-Horne-Shimony-Holt inequality after distributing entanglement. Besides being of fundamental interest, our result represents a significant step towards a global quantum network. Moreover, the high-frequency and high-accuracy acquiring, pointing and tracking technique developed in our experiment provides an essential tool for future satellite-based quantum communication.
This same group research group, including the same first author, published in Nature last year. http://arxiv.org/abs/1205.2024 Since it's common practice to first post to the ArXiv before submitting to a journal (note, for instance, that the first version of their Nature paper…
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