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In order to reduce this fundamental
noise, one has to act on the field quadrature that is measured in the
experiment. Reducing its fluctuations below the standard quantum limit
does improve the sensibility of optical measurement. This can be achieved
using the interaction between the field and a non-linear medium. The
same interaction can also be used to produce entanglement, i.e. strong
quantum correlations between the quadratures of two field, or between
the field and the medium considered.
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Updated the 13/01/2004 by Nicolas
Treps
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