Jeff (Sichao) Xu

jeffxusichao AT berkeley DOT edu

I am a fourth-year undergraduate student majoring in mathematics and computer science at UC Berkeley, where I am fortunate to be advised by Prasad Raghavendra. Previously, I also had the pleasure of working with Siu On Chan at CUHK. I am graduating in May, 2020 and I am currently applying for PhD Program in Theoretical Computer Science in this cycle.

I am interested in theoretical computer science in general. Recently, I have spent most of my time thinking about convex relaxation hierarchies and their limitations, as well as the intersection of tcs and statistical physics. More broadly, I am interested in hardness of approximation, average-case complexity, random matrix theory and proof complexity.


Lifting Sum-of-Squares Lower Bounds: Degree-2 to Degree-4. arxiv

with Sidhanth Mohanty, and Prasad Raghavendra.
STOC 2020.

Teaching Experience:

CS170: Efficient Algorithms and Intractable Problems. (Fall 2018, Spring 2020).

Teaching Assistant

CS 174: Randomized Algorithms. (Spring, Fall 2019).

Head Teaching Assistant