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Collisional Narrowing and Dynamical Decoupling in a Dense Ensemble of Cold Atoms (Paperback, 2012 ed.)
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Collisional Narrowing and Dynamical Decoupling in a Dense Ensemble of Cold Atoms (Paperback, 2012 ed.)
Series: Springer Theses
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Ultra-cold atomic ensembles have emerged in recent years as a
powerful tool in many-body physics research, quantum information
science and metrology. This thesis presents an experimental and
theoretical study of the coherent properties of trapped atomic
ensembles at high densities, which are essential to many of the
aforementioned applications. The study focuses on how
inter-particle interactions modify the ensemble coherence dynamics,
and whether it is possible to extend the coherence time by means of
external control. The thesis presents a theoretical model which
explains the effect of elastic collision of the coherence dynamics
and then reports on experiments which test this model successfully
in the lab. Furthermore, the work includes the first implementation
of dynamical decoupling with ultra-cold atomic ensembles. It is
demonstrated experimentally that by using dynamical decoupling the
coherence time can be extended 20-fold. This has a great potential
to increase the usefulness of these ensembles for quantum
computation.
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