A Caltech Library Service

Superconducting Circuit Architectures Based on Waveguide Quantum Electrodynamics


Zhang, Xueyue (2023) Superconducting Circuit Architectures Based on Waveguide Quantum Electrodynamics. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/c7d8-nn87.


Quantum science and technology provides new possibilities in processing information, simulating novel materials, and answering fundamental questions beyond the reach of classical methods. Realizing these goals relies on the advancement of physical platforms, among which superconducting circuits have been one of the leading candidates offering complete control and read-out over individual qubits and the potential to scale up. However, most circuit-based multi-qubit architectures only include nearest-neighbor (NN) coupling between qubits, which limits the efficient implementation of low-overhead quantum error correction and access to a wide range of physical models using analog quantum simulation.

This challenge can be overcome by introducing non-local degrees of freedom. For example, photons in a shared channel between qubits can mediate long-range qubit-qubit coupling arising from light-matter interaction. In addition, constructing a scalable architecture requires this channel to be intrinsically extensible, in which case a one-dimensional waveguide is an ideal structure providing the extensible direction as well as strong light-matter interaction.

In this thesis, we explore superconducting circuit architectures based on light-matter interactions in waveguide quantum electrodynamics (QED) systems. These architectures in return allow us to study light-matter interaction, demonstrating strong coupling in the open environment of a waveguide by employing sub-radiant states resulting from collective effects. We further engineer the waveguide dispersion to enter the topological photonics regime, exploring interactions between qubits that are mediated by photons with topological properties. Finally, towards the goals of quantum information processing and simulation, we settle into a multi-qubit architecture where the photon-mediated interaction between qubits exhibits tunable range and strength. We use this multi-qubit architecture to construct a lattice with tunable connectivity for strongly interacting microwave photons, synthesizing a quantum many-body model to explore chaotic dynamics. The architectures in this thesis introduce scalable beyond-NN coupling between superconducting qubits, opening the door to the exploration of many-body physics with long-range coupling and efficient implementation of quantum information processing protocols.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Quantum science and technology; Superconducting circuits; Analog quantum simulation; Light-matter interaction; Waveguide quantum electrodynamics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Physics
Awards:Yariv/Blauvelt Fellowship
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Painter, Oskar J.
Thesis Committee:
  • Faraon, Andrei (chair)
  • Painter, Oskar J.
  • Endres, Manuel A.
  • Refael, Gil
Defense Date:21 February 2023
Funding AgencyGrant Number
AFOSR Quantum Photonic Matter MURIFA9550-16-1-0323
DOE-BES Quantum Information Science ProgramDE-SC0020152
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
NSF Physics Frontiers CenterPHY-1125565
Gordon and Betty Moore FoundationUNSPECIFIED
Kavli Nanoscience Institute at CaltechUNSPECIFIED
AWS Center for Quantum ComputingUNSPECIFIED
Yariv/Blauvelt FellowshipUNSPECIFIED
Record Number:CaltechTHESIS:03112023-174134421
Persistent URL:
Related URLs:
URLURL TypeDescription adapted for Ch. 4 adapted for Ch. 5 adapted for Ch. 6
Zhang, Xueyue0000-0001-8994-0629
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15117
Deposited By: Xueyue Zhang
Deposited On:20 Mar 2023 17:23
Last Modified:08 Nov 2023 18:50

Thesis Files

[img] PDF - Final Version
See Usage Policy.


Repository Staff Only: item control page