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Localization And Scrambling Of Quantum Information With Applications To Quantum Computation And Thermodynamics, Adrian Kristian Chapman
Localization And Scrambling Of Quantum Information With Applications To Quantum Computation And Thermodynamics, Adrian Kristian Chapman
Physics & Astronomy ETDs
As our demand for computational power grows, we encounter the question: "What are the physical limits to computation?" An answer is necessarily incomplete unless it can incorporate physics at the smallest scales, where we expect our near-term high-performance computing to occur. Microscopic physics -- namely, quantum mechanics -- behaves counterintuitively to our everyday experience, however. Quantum matter can occupy superpositions of states and build stronger correlations than are possible classically. This affects how quantum computers and quantum thermodynamic engines will behave.
Though these properties may seem to overwhelmingly defeat our attempts to build a quantum computer at-first-glance, what is remarkable …
Dispersive Quantum Interface With Atoms And Nanophotonic Waveguides, Xiaodong Qi
Dispersive Quantum Interface With Atoms And Nanophotonic Waveguides, Xiaodong Qi
Physics & Astronomy ETDs
Strong coupling between atoms and light is critical for quantum information processing and precise sensing. A nanophotonic waveguide is a promising platform for realizing an atom-light interface that reaches the strong coupling regime. In this dissertation, we study the dispersive response theory of the nanowaveguide system as the means to create an entangling atom-light interface, with applications to quantum non-demolition (QND) measurement and spin squeezing.
We calculate the dyadic Green's function, which determines the scattering of light by atoms in the presence of a nanowaveguide, and thus the phase shift and polarization rotation induced on the guided light. The Green's …