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This thesis reports on major steps towards the realization of
scalable quantum networks. It addresses the experimental
implementation of a deterministic interaction mechanism between
flying optical photons and a single trapped atom. In particular, it
demonstrates the nondestructive detection of an optical photon. To
this end, single rubidium atoms are trapped in a three-dimensional
optical lattice at the center of an optical cavity in the strong
coupling regime. Full control over the atomic state - its position,
its motion, and its electronic state - is achieved with laser beams
applied along the resonator and from the side. When faint laser
pulses are reflected from the resonator, the combined atom-photon
state acquires a state-dependent phase shift. In a first series of
experiments, this is employed to nondestructively detect optical
photons by measuring the atomic state after the reflection process.
Then, quantum bits are encoded in the polarization of the laser
pulse and in the Zeeman state of the atom. The state-dependent
phase shift mediates a deterministic universal quantum gate between
the atom and one or two successively reflected photons, which is
used to generate entangled atom-photon, atom-photon-photon, and
photon-photon states out of separable input states.
This thesis reports on major steps towards the realization of
scalable quantum networks. It addresses the experimental
implementation of a deterministic interaction mechanism between
flying optical photons and a single trapped atom. In particular, it
demonstrates the nondestructive detection of an optical photon. To
this end, single rubidium atoms are trapped in a three-dimensional
optical lattice at the center of an optical cavity in the strong
coupling regime. Full control over the atomic state - its position,
its motion, and its electronic state - is achieved with laser beams
applied along the resonator and from the side. When faint laser
pulses are reflected from the resonator, the combined atom-photon
state acquires a state-dependent phase shift. In a first series of
experiments, this is employed to nondestructively detect optical
photons by measuring the atomic state after the reflection process.
Then, quantum bits are encoded in the polarization of the laser
pulse and in the Zeeman state of the atom. The state-dependent
phase shift mediates a deterministic universal quantum gate between
the atom and one or two successively reflected photons, which is
used to generate entangled atom-photon, atom-photon-photon, and
photon-photon states out of separable input states.
Verhandlungsunterstutzungssysteme bieten verschiedene Methoden zur
Entscheidungsfindung fur komplexe, integrative
Geschaftsverhandlungen. Andreas Reiser untersucht die mangelnde
Berucksichtigung unvollstandiger Informationen dieser Systeme,
zeigt Probleme auf, die hierbei entstehen koennen und entwickelt
konkrete Loesungen, um unvollstandige Informationen in der
Praferenzmessung berucksichtigen zu koennen.
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