Maryam Abbasi


Date of Award

Spring 5-15-2023

Author's School

Graduate School of Arts and Sciences

Author's Department


Degree Name

Doctor of Philosophy (PhD)

Degree Type



The investigation of quantum systems in experimental setups involves interaction with the environment, which introduces channels of dissipation. These systems can be described by a non-Hermitian Hamiltonian, capturing the effect of gain and loss. Realizing these systems in classical cases demonstrates interesting phenomena such as topological features in the optical and mechanical domain, energy transfer, and enhancement in sensing. The primary focus of this thesis is the realization of the non-Hermiticity in a quantum system. To accomplish this, we harness multiple energy levels of an anharmonic superconducting circuit with coupling to an engineered bath to investigate the static and dynamic features of the system. The static features of our system provide us with detail about the energy landscape and its corresponding eigenstate. The unique energy landscape is investigated further by using a time-dependent drive to study the adiabatic limit. In dissipative dynamics, the role of quantum jumps becomes crucial in studying adiabatic processes. Further study of the non-Hermiticity with decoherence processes exhibits unique topology and energy landscape which will help us understand more complex open quantum systems. These studies provide insight into open quantum system dynamics and how to harness their unique characteristics in a fully quantum regime.


English (en)

Chair and Committee

Kater K. Murch

Committee Members

Kater K. Murch, Erik E. Henriksen, Alexander A. Seidel, Yogesh Y. Joglekar,