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65 lines
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Competition between Weak Quantum Measurement and Many-Body Dynamics in Ultracold Bosonic Gases - DPhil thesis by Wojciech Kozlowski
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A dissertation submitted for the degree of *Doctor of Philosophy* at
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the University of Oxford.
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Abstract
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--------
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Trapping ultracold atoms in optical lattices enabled the study of
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strongly correlated phenomena in an environment that is far more
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controllable and tunable than what was possible in condensed
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matter. Here, we consider coupling these systems to quantised light
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where the quantum nature of both the optical and matter fields play
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equally important roles in order to push the boundaries of what is
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possible in ultracold atomic systems.
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We show that light can serve as a nondestructive probe of the quantum
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state of matter. By considering a global measurement we show that it
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is possible to distinguish a highly delocalised phase like a
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superfluid from the Bose glass and Mott insulator. We also demonstrate
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that light scattering reveals not only density correlations, but also
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matter-field interference.
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By taking into account the effect of measurement backaction we show
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that the measurement can efficiently compete with the local atomic
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dynamics of the quantum gas. This can generate long-range correlations
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and entanglement which in turn leads to macroscopic multimode
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oscillations across the whole lattice when the measurement is weak and
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correlated tunnelling, as well as selective suppression and
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enhancement of dynamical processes beyond the projective limit of the
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quantum Zeno effect in the strong measurement regime.
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We also consider quantum measurement backaction due to the measurement
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of matter-phase-related variables such as global phase coherence. We
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show how this unconventional approach opens up new opportunities to
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affect system evolution and demonstrate how this can lead to a new
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class of measurement projections thus extending the measurement
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postulate for the case of strong competition with the system’s own
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evolution.
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Download
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--------
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You can obtain the source files by either:
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- cloning the git repository with ``git clone https://gitlab.wojciechkozlowski.eu/wojtek/thesis.git``
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- downloading them as a zip archive from https://gitlab.wojciechkozlowski.eu/wojtek/thesis/repository/archive.zip?ref=master
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- downloading them as a tar.gz archive from https://gitlab.wojciechkozlowski.eu/wojtek/thesis/repository/archive.tar.gz?ref=master
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- downloading them as a tar.bz2 archive from https://gitlab.wojciechkozlowski.eu/wojtek/thesis/repository/archive.tar.bz2?ref=master
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- downloading them as a tar archive from https://gitlab.wojciechkozlowski.eu/wojtek/thesis/repository/archive.tar?ref=master
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LaTeX template
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--------------
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This thesis was created with the LaTeX / XeLaTeX / LuaLaTeX PhD thesis
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template for Cambridge University Engineering Department by Krishna
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Kumar. See
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http://www-h.eng.cam.ac.uk/help/tpl/textprocessing/ThesisStyle/ for
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more details.
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