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Nature 446, 275-276 (15 March 2007) | doi:10.1038/446275a; Published online 14 March 2007

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Quantum physics: Total surveillance

Ferdinand Schmidt-Kaler1

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Trapped by mirrors, a photon can be monitored from birth to death by a stream of passing atoms. The technique could also be used to entangle the quantum states of many atoms — a possible boon for quantum computing.

"You measured this only once?" Such enquiries from professor to student are often heard in the experimental laboratory.

  1. Ferdinand Schmidt-Kaler is at the Institut für Quanteninformationsverarbeitung, Universität Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany.
    Email: ferdinand.schmidt-kaler@uni-ulm.de

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