101 research outputs found
Polarization squeezing by optical Faraday rotation
We show that it is possible to generate continuous-wave fields and pulses of
polarization squeezed light by sending classical, linearly polarized laser
light twice through an atomic sample which causes an optical Faraday rotation
of the field polarization. We characterize the performance of the process, and
we show that an appreciable degree of squeezing can be obtained under realistic
physical assumptions.Comment: 4 pages, 4 figure
Deterministic atom-light quantum interface
The notion of an atom-light quantum interface has been developed in the past
decade, to a large extent due to demands within the new field of quantum
information processing and communication. A promising type of such interface
using large atomic ensembles has emerged in the past several years. In this
article we review this area of research with a special emphasis on
deterministic high fidelity quantum information protocols. Two recent
experiments, entanglement of distant atomic objects and quantum memory for
light are described in detail.Comment: 50 pages (bookstyle) 15 graphs, to be published in "Advances in
Atomic, Molecular, and Optical Physics" Vol. 54. (2006)(Some of the graphs
here have lower resolution than in the version to be published
Dynamical effects of exchange symmetry breaking in mixtures of interacting bosons
In a double-well potential, a Bose-Einstein condensate exhibits Josephson
oscillations or self-trapping, depending on its initial preparation and on the
ratio of inter-particle interaction to inter-well tunneling. Here, we elucidate
the role of the exchange symmetry for the dynamics with a mixture of two
distinguishable species with identical physical properties, i.e. which are
governed by an isospecific interaction and external potential. In the
mean-field limit, the spatial population imbalance of the mixture can be
described by the dynamics of a single species in an effective potential with
modified properties or, equivalently, with an effective total particle number.
The oscillation behavior can be tuned by populating the second species while
maintaining the spatial population imbalance and all other parameters constant.
In the corresponding many-body approach, the single-species description
approximates the full counting statistics well also outside the realm of
spin-coherent states. The method is extended to general Bose-Hubbard systems
and to their classical mean-field limits, which suggests an effective
single-species description of multicomponent Bose gases with weakly
an-isospecific interactions.Comment: amended and expanded, accepted for Phys. Rev. A, 14 pages, 7 figure
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