Abstract
Circuit quantum electrodynamics provides a unique platform for investigating fundamental physics and practical quantum applications. In this thesis, I introduce the superconducting circuit platform from a foundational perspective. Drawing inspiration from quantum electrodynamics and utilizing the analog of closed time-like curves, this work achieves quantum enhancement over classical strategies. Specifically, I investigate agnostic phase estimation protocol and the associated approaches that leverage quantum entanglement to optimally estimate an unknown rotation angle without requiring prior knowledge of the rotation axis. This work not only demonstrates a proof of concept for a type of entanglement-assisted metrology but also highlights intriguing quantum effects. To establish the theoretical framework, I include a pedagogical introduction to quantum and classical Fisher information - the key concepts we utilize for quantifying sensor performance. Finally, I detail the experimental techniques that enable the demonstration of metrological advantage, weighing the benefits of quantum enhancement against the costs of entanglement manipulation.
Committee Chair
Kater Murch
Committee Members
Chong Zu; Erik Henriksen; Kater Murch; Michael Ogilvie; Robert Wexler
Degree
Doctor of Philosophy (PhD)
Author's Department
Physics
Document Type
Dissertation
Date of Award
5-2-2025
Language
English (en)
DOI
https://doi.org/10.7936/xcd1-q425
Author's ORCID
https://orcid.org/0000-0002-1944-7211
Recommended Citation
Song, Xingrui, "Entanglement-Enhanced Metrology With Superconducting Circuits" (2025). Arts & Sciences Theses and Dissertations. 3495.
The definitive version is available at https://doi.org/10.7936/xcd1-q425