Projective filtering of the fundamental eigenmode from spatially multimode radiationстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 11 января 2016 г.
Аннотация:Lossless ltering of a single coherent (Schmidt) mode from spatially multimode radiation is a
problem crucial for optics in general and for quantum optics in particular. It becomes especially
important in the case of nonclassical light that is fragile to optical losses. An example is bright
squeezed vacuum generated via high-gain parametric down conversion or four-wave mixing. Its
highly multiphoton and multimode structure oers a huge increase in the information capacity
provided that each mode can be addressed separately. However, the nonclassical signature of bright
squeezed vacuum, photon-number correlations, are much aected by losses. Here we demonstrate
lossless ltering of a single spatial Schmidt mode by projecting the spatial spectrum of bright
squeezed vacuum on the eigenmode of a single-mode ber. Moreover, we show that the rst Schmidt
mode can be captured by simply maximizing the ber-coupled intensity. Importantly, the projection
operation does not aect the radiation and leaves it usable for further applications.