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dphil-thesis/Abstract/abstract.tex
Wojciech Kozlowski 42d24ce7d7 Final version 1.0
2016-09-28 17:57:49 +01:00

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% ************************** Thesis Abstract *****************************
% Use `abstract' as an option in the document class to print only the titlepage and the abstract.
\begin{abstract}
Trapping ultracold atoms in optical lattices enabled the study of
strongly correlated phenomena in an environment that is far more
controllable and tunable than what was possible in condensed
matter. Here, we consider coupling these systems to quantised light
where the quantum nature of both the optical and matter fields play
equally important roles in order to push the boundaries of
what is possible in ultracold atomic systems.
We show that light can serve as a nondestructive probe of the
quantum state of the matter. By condering a global
measurement scheme we show that it is possible to distinguish a
highly delocalised phase like a superfluid from insulators. We also
demonstrate that light scattering reveals not only density
correlations, but also matter-field interference.
By taking into account the effect of measurement backaction we show
that the measurement can efficiently compete with the local atomic
dynamics of the quantum gas. This can generate long-range
correlations and entanglement which in turn leads to macroscopic
multimode oscillations accross the whole lattice when the
measurement is weak and correlated tunneling, as well as selective
suppression and enhancement of dynamical processes beyond the
projective limit of the quantum Zeno effect in the strong
measurement regime.
We also consider quantum measurement backaction due to the
measurement of matter-phase-related variables such as global phase
coherence. We show how this unconventional approach opens up new
opportunities to affect system evolution and demonstrate how this
can lead to a new class of measurement projections thus extending
the measurement postulate for the case of strong competition with
the systems own evolution.
\end{abstract}