Theses and Dissertations from UMD

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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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2008 - 200912020 - 20241

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Subject: search.filters.subject.Photonic Crystal

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    Photon-Mediated Interactions in Lattices of Coplanar Waveguide Resonators
    (2024) Amouzegar, Maya; Kollár, Alicia; Physics; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Circuit quantum electrodynamics (circuit QED) has become one of the main platforms for quantum simulation and computation. One of its notable advantages is its ability to facilitate the study of new regimes of light-matter interactions. This is achieved due to the native strong coupling between superconducting qubits and microwave resonators, and the ability to lithographically define a large variety of resonant microwave structures, for example, photonic crystals. Such geometries allow the implementation of novel forms of photon-mediated qubit-qubit interaction, cross-Kerr qubit-mediated interactions, and studies of many-body physics. In this dissertation, I will show how coplanar waveguide (CPW) lattices can be used to create engineered photon-mediated interactions between superconducting qubits. I will discuss the design and fabrication of a quasi one-dimensional lattice of CPW resonators with unconventional bands, such as gapped and ungapped flat bands. I will then present experimental data characterizing photon-mediated interactions between tunable transmon qubits and qubit-mediated non-linear photon-photon interactions in the said lattice. Our results indicate the realization of unconventional photon-photon interactions and qubit-qubit interactions, therefore, demonstrating the utility of this platform for probing novel interactions between qubits and photons. In future design iterations, one can extend the study of these interactions to two-dimensional flat and hyperbolic lattices.
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    MICRORESONATORS AND PHOTONIC CRYSTALS FOR QUANTUM OPTICS AND SENSING
    (2008-07-21) Sahand, Sina; Waks, Edo; Electrical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The ability to store and manipulate light on micro-to-nanometer scales opens up doors of opportunity in biological sensing, quantum information, and creating all-optical interconnects on a chip. In this thesis, we present our effort along these directions. We take advantage of silicon nitride photonic crystals and microdisk resonators to confine and manipulate photons in the visible spectrum. We present a novel cavity design to obtain high quality-factor cavities and present our fabrication process. In addition, we present a novel techniques aimed at coupling cadmium-selenide colloidal QDs to photonic crystal cavities and discuss a method for freezing their kinetics through solidifying the liquid. This technique takes advantage of electroosmotic flow in microfluidic channels to control and steer QDs. Moreover, we analyze theoretically some interesting phenomenon, such as, coupling two quantum dots to a cavity.