A trapped ion emits a photon. Ion and photon are entangled, so the photon carries away information on the state of the ion. Now realized, this system could become a communication link in a quantum network.
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Polzik, E. Flight of the qubit. Nature 428, 129–130 (2004). https://doi.org/10.1038/428129a
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DOI: https://doi.org/10.1038/428129a
