Quantum walk via open systems

Jeremy Philip Jacques Rodriguez

    Research output: ThesisDoctoral Thesis

    479 Downloads (Pure)

    Abstract

    In this thesis, we present a study of quantum walks with an open quantum system formalism. In this way we allow the walkers to interact with a surrounding environment, and by doing so we are able to add directionality to the paths that the walkers take on a given graph. A theoretical and mathematical framework for performing a directed quantum walk is established, which works for general continuous-time quantum walks on any weighted and/or directed graphs. Since quantum correlations, such as entanglement and quantum discord, play an important role in quantum computation and quantum information processing, a detailed study is also carried out on their dynamical change while two quantum particles walk through specified graphs. Finally the electron transport process in molecules is simulated using quantum walks, in particular in the Titanium dioxide (TiO2) electrode as well as the Fenna-Matthews-Olson protein complex. Quantum correlations are measured in these two systems, showing some evidence of entanglement assisted transport of the excitons in the Fenna-Matthews-Olson protein complex, but not in the TiO2 electrode.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Publication statusUnpublished - 11 Jan 2016

    Fingerprint Dive into the research topics of 'Quantum walk via open systems'. Together they form a unique fingerprint.

    Cite this