# Pedro Paredes

## I'm **Pedro Paredes** from Princeton University

I'm a Teaching Professor at Princeton University in the Department of Computer Science.

Before joining Princeton, I completed my PhD in Computer
Science in 2022 at
**Carnegie Mellon University**, where I was very lucky to be
advised
by Ryan
O'Donnell. Prior to that, I graduated from
**University of Porto** in 2017 with a Bachelor's and a Master's
degree, where I was also lucky to be advised
by Pedro
Ribeiro.

My primary research interest is in **Theoretical
Computer Science**. In particular I am interested
in:

__Spectral Graph Theory__,
__Pseudorandomness__, __Coding Theory__, __Combinatorics__, __Quantum Information Theory__.

### Publications

® Author order randomized

- J. Hsieh, T. McKenzie, S. Mohanty,
__P. Paredes__.*Explicit two-sided unique-neighbor expanders*.

STOC '24 | PDF - R. O'Donnell, R. Servedio,
__P. Paredes__®.*Explicit orthogonal and unitary designs*.

FOCS '23 | PDF - F. G. Jeronimo, T. Mittal, R. O'Donnell,
__P. Paredes__, M. Tulsiani.*Explicit Abelian Lifts and Quantum LDPC Codes*.

ITCS '22 | PDF __P. Paredes__.*Spectrum preserving short cycle removal on regular graphs*.

STACS '21 | PDF- S. Mohanty, R. O'Donnell,
__P. Paredes__.*Explicit near-Ramanujan graphs of every degree*.

STOC '20 | SIAM Journal on Computing '21, special section on STOC 2020 | PDF - S. Mohanty, R. O'Donnell,
__P. Paredes__.*The SDP value for random two-eigenvalue CSPs*.

STACS '20 | PDF

For a full list of publications check out my Google Scholar or DBLP.

#### Surveys and Theses

__P. Paredes__.*On the Expansion of Graphs*.

PhD Thesis | PDF- P. Ribeiro,
__P. Paredes__, M. E.P. Silva, D. Aparicio, F. Silva.

*A Survey on Subgraph Counting: Concepts, Algorithms and Applications to Network Motifs and Graphlets*.

ACM Computing Surveys '21 | PDF

### Talks

- Explicit orthogonal and unitary designs | FOCS'23, Nov 23
- Pseudorandom Approximate Unitary Designs | IAS PCMI 2023 Summer Session, Jul 23 | Slides
- Pseudorandom rotations: explicit approximate designs for some Lie groups | Princeton Theory Lunch, Dec 22 | Video
- Spectrum preserving short cycle removal on regular graphs | STACS'21, Mar 21 | Video
- Spectrum preserving operations in regular graphs | UW Theory Seminar, Jan 21 | Video
- Expander Graphs: Theory and Applications | Talks@DCC, Jul 20
- Explicit near-Ramanujan graphs of every degree (Joint with S. Mohanty) | STOC'20, Jun 20 | Video
- Explicit near-Ramanujan graphs of every degree | CMU Theory lunch, Nov 19 | Video

### Teaching

- Faculty | COS 226: Algorithms and Data Structures, Fall 2023
- Faculty | COS 445: Economics and Computing, Spring 2023
- Faculty | COS 126: Computer Science: An Interdisciplinary Approach, Fall 2022

#### Before Princeton

- Teaching Assistant | CMU 15-751 : TCS Toolkit
- Teaching Assistant | CMU 15-451 : Algorithms
- Teaching Assistant | FCUP CC1007 : Data Structures

#### Advising

- Undergraduate Research Advisor | Amir Touil
- Undergraduate Research Advisor | Ijay Narang

#### Before Princeton

- Undergraduate Mentor | Jeremy Brennan | CMU 07-400 : Research Practicum in Computer Science

### Projects

#### Competitive programming

I run the competitive programming club at Princeton

#### Modern Coding Theory and Expanders Reading Group

Fernando Granha Jeronimo and I co-organized a coding theory and expanders reading group jointly at Princeton and the IAS.

### About me

#### Computer Science and Math outreach

I am an instructor for MISE. Here is an example of an Introduction to Programming I taught in the Summer of 2023. I was an instructor and co-organizer of the Pan-African Math Circle.

#### Competitive programming

I'm the head of the scientific committee of the Portuguese National Olympiad or ONI (link in Portuguese).

Here are some problems I authored that I like:

*Italian Data Centers*| ICPC SWERC 2023 | link*European Trip*| ICPC SWERC 2022 | link*Springboards*| USACO 2020 January Contest, Gold | link*Topografia dos Onimalaias*| ONI'2019 Final Round | link (in Portuguese)*Chegar ao outro lado*| ONI'2017 Final Round | link (in Portuguese)

#### Miscellaneous

- Map of countries I've visited.
- I'm a Pittsburgh Steelers fan and an Anaheim Ducks fan.