Event
Ph.D. Research Proposal Exam: Zhiyin Tu
Friday, April 4, 2025
2:00 p.m.-4:00 p.m.
Physical Sciences Complex Building (PSC), Room 3150
Maria Hoo
301 405 3681
mch@umd.edu
ANNOUNCEMENT: Ph.D. Research Proposal Exam
Name: Zhiyin Tu
Committee:
Professor Alicia Kollár (Chair/Advisor)
Professor Ronald Walsworth
Professor Thomas Antonsen
Date/time: Friday, April 4th, 2025, 2:00 pm - 4:00 pm
Location: Physical Sciences Complex Building (PSC), Room 3150
Title: Non-reciprocal Devices for Superconducting Circuits
Abstract: Non-reciprocity is vital for protecting superconducting qubits from undesired back-propagation and ensuring directional routing of quantum information. Commercial cryogenic non-reciprocal components, however, rely on permanent magnets to break time-reversal symmetry, making them bulky and unsuitable for on-chip integration in scalable quantum computing architectures. Spatio-temporal modulation has emerged as a promising alternative, demonstrating success in photonics and room-temperature electronics. In this proposal, we introduce two distinct approaches to achieve non-reciprocal transmission through spatio-temporal modulation. The first approach applies modulation to the resonance frequencies of two coupled resonators, while the second modulates the coupling coefficients at multiple sites between a single resonator and a waveguide. With most of the work on the first approach completed, this proposal is structured into two parts: presenting the results of the first approach and outlining the implementation plan for the second.
