Quantum non-demolition measurements in optics

Philippe Grangier (), Juan Ariel Levenson and Jean-Philippe Poizat
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Philippe Grangier: Laboratoire Charles Fabry de l'Institut d'Optique, CNRS (URA 14)
Juan Ariel Levenson: France Telecom/CNET/DTD/Laboratoire de Bagneux, CNRS (URA 250)
Jean-Philippe Poizat: Laboratoire Charles Fabry de l'Institut d'Optique, CNRS (URA 14)

Nature, 1998, vol. 396, issue 6711, 537-542

Abstract: Abstract Quantum non-demolition measurements are designed to circumvent the limitations imposed by Heisenberg's uncertainty principle when performing repeated measurements of quantum states. Recent progress in quantum optics has enabled the experimental realization of quantum non-demolition measurements of the photon flux of a light beam. This achievement bears on fundamental issues about the ultimate sensitivity of measurements, and may open the way for applications such as noise-free information tapping in optical telecommunications.

Date: 1998
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DOI: 10.1038/25059

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