Quantum non-demolition measurements in optics

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...

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Bibliographic Details
Published in:Nature (London) 1998-12, Vol.396 (6711), p.537-542
Main Authors: Grangier, Philippe, Levenson, Juan Ariel, Poizat, Jean-Philippe
Format: Article
Language:English
Subjects:
Bears
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Flux
Foundations, theory of measurement, miscellaneous theories (including aharonov-bohm effect, bell inequalities, berry's phase)
Fundamental areas of phenomenology (including applications)
Humanities and Social Sciences
Light beams
Measurement
multidisciplinary
Nonclassical field states
squeezed, antibunched and sub-poissonian states
operational definitions of the phase of the field
phase measurements
Optics
Photons
Physics
Quantum mechanics
Quantum optics
Quantum theory
review-article
Science
Science (multidisciplinary)
Tapping
Telecommunications
Uncertainty
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Summary: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.
ISSN:0028-0836
1476-4687
DOI:10.1038/25059