[CS] Siddharth Dangwal MS PresentationMay 14, 2025

[via cs]

This is an announcement of Siddharth Dangwal's MS Presentation
===============================================
Candidate: Siddharth Dangwal

Date: Wednesday, May 14, 2025

Time: 11 am CST

Remote Location: https://uchicago.zoom.us/j/7428246509?pwd=TE15eVA4azVsdVB3YnNKcjhBRXZlUT09

Location: JCL 346

Title: Variational Quantum Algorithms in the era of Early Fault Tolerance

Abstract: Quantum computing roadmaps predict the availability of 10,000 qubit devices within the next 3–5 years. With projected two-qubit error rates of 0.1%, these systems will enable certain operations under quantum error correction (QEC) using lightweight codes, offering significantly improved fidelities compared to the NISQ era. However, the high qubit cost of QEC codes like the surface code (especially at near-threshold physical error rates) limits the error correction capabilities of these devices. In this emerging era of Early Fault Tolerance (EFT), it will be essential to use QEC resources
efficiently and focus on applications that derive the greatest benefit. In this work, we investigate the implementation of Variational Quantum Algorithms in the EFT regime (EFT-VQA). We introduce partial error correction (pQEC), a strategy that error-corrects Clifford operations while performing 𝑅𝑧 rotations via magic state injection instead of the more expensive T-state distillation. Our results show that pQEC can improve VQA fidelities by 9.27x over standard approaches. Furthermore, we propose architectural optimizations that reduce circuit latency by∼2x, and achieve qubit packing efficiency of 66% in the EFT regime.

Advisors: Fred Chong

Committee Members: Fred Chong, Bill Fefferman, Moin Qureshi, Ken Brown