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Multimode Optomechanical Systems and Phononic Networks

An optomechanical system consists of an optical cavity mode coupled

to a mode of a mechanical oscillator. Depending on the configuration of the

system, the optomechanical interaction can be used to drive or cool the

mechanical mode, coherently swap the optical and mechanical states, or create


A multimode optomechanical system consists of many optical (mechanical) modes

coupled to a mechanical (optical) mode. With the tools of the optomechanical

interaction, multimode optomechanical systems provide a rich platform to study

new physics and technologies. A central challenge in optomechanical systems

is to mitigate the effects of the thermal environment, which remains

significant even at cryogenic temperatures, for mechanical oscillators

typically used in optomechanical systems. The central theme of this thesis is

to study how the properties of multimode optomechanical systems can be used

for such mitigation of thermal noise.

The most straightforward extension of an optomechanical system to a multimode

system is to have a single optical mode couple to two mechanical modes, or a

single mechanical mode couple to two optical modes. In this thesis, we study

both types of multimode system. In each case, we study the formation of a

dark mode, an eigenstate of the three-mode system that is of particular

interest. When the system is in a dark state, the two modes of similar

character (optical or mechanical) interact with each other through the mode of

dissimilar character, but due to interference, the interaction becomes

decoupled from the properties of the dissimilar mode.

Another interesting application of the three-mode system is two-mode optical

entanglement, generated through mechanical motion. Such entanglement tends to

be sensitive to thermal noise. We propose a new method for generating

two-mode optical entanglement in the three-mode system that is robust against

the thermal environment of the mechanical mode.

Finally, we propose a novel, scalable architecture for a quantum computer.

The architecture makes use of the concepts developed earlier in the thesis,

and applies them to a system that on the surface looks quite different from

the standard optomechanical system, but is formally equivalent.

This dissertation includes previously published and unpublished coauthored

Date11 January 2019
CreatorsKuzyk, Mark
Contributorsvan Enk, Steven
PublisherUniversity of Oregon
Source SetsUniversity of Oregon
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation
RightsAll Rights Reserved.

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