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Nature 428, 129-130 (11 March 2004) | doi:10.1038/428129a

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Quantum information:  Flight of the qubit

Eugene Polzik1

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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.

A quantum computer would be capable of performing certain operations, such as factoring large numbers, exponentially faster than its classical counterpart. It could also efficiently model processes that are excessively difficult to model using existing technology.

  1. Eugene Polzik is at the Niels Bohr Institute and at the Danish National Research Foundation Center for Quantum Optics (QUANTOP), Blegdamsvej 17, Copenhagen 2100, Denmark.
    e-mail: Email: polzik@nbi.dk

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