Jason Chadwick
Jason D. Chadwick
Quantum computing Ph.D. student
University of Chicago

Google Scholar


I am a first-year computer science Ph.D. student at the University of Chicago studying quantum computer systems with Fred Chong. Previously, I graduated from Carnegie Mellon University with a B.S. in physics and a minor in computer science.

My research focuses on low-level software optimizations that narrow the gap between existing error-prone hardware and the future goal of large-scale fault-tolerant quantum computation, improving the efficiency and reliability of current and near-term quantum machines. I have published or am currently working on research in the areas of control pulse engineering, device calibration, circuit compilation, and high-radix computation. My work is part of EPiQC, an NSF Expedition in Computing.


* indicates equal contribution
Efficient control pulses for continuous quantum gate families through coordinated re-optimization
Jason D. Chadwick and Frederic T. Chong
project PDF arXiv code
We present a method that allows quantum hardware to execute arbitrary operations at the pulse level by interpolating between a small number of known reference pulses. We demonstrate the procedure on the continuous space of all two-qubit operations.
Dancing the Quantum Waltz: Compiling Three-Qubit Gates on Four Level Architectures
(to appear) ISCA 2023
Andrew Litteken, Lennart Maximilian Seifert, Jason D. Chadwick, Natalia Nottingham, Tanay Roy, Ziqian Li, David Schuster, Jonathan M. Baker, and Frederic T. Chong
We extend our previous work on qubit-to-ququart compression to specifically optimize three-qubit gates such as the Toffoli gate. We also find significant advantages in using Z-type multi-bit operations instead of X-type operations.
Qompress: Efficient Compilation for Ququarts Exploiting Partial and Mixed Radix Operations for Communication Reduction
(to appear) ASPLOS 2023
Andrew Litteken, Lennart Maximilian Seifert, Jason D. Chadwick, Natalia Nottingham, Jonathan M. Baker, and Frederic T. Chong
project PDF ACM Digital Library arXiv
We consider selectively compressing pairs of qubits into single four-state ququarts. We generate efficient "partial" operations between ququarts and qubits, which motivates a compiler that can transform any quantum circuit into this framework.
Time-Efficient Qudit Gates through Incremental Pulse Re-seeding
QCE 2022
Lennart Maximilian Seifert*, Jason D. Chadwick*, Andrew Litteken, Frederic T. Chong, and Jonathan M. Baker
project PDF IEEE Xplore arXiv poster
We present a method to iteratively obtain short-duration quantum control pulses when it is not possible to directly modify the objective function. We use this to find gate durations for high-radix logic gates that scale better than expected.
Prediction of electron density and pressure profile shapes on NSTX-U using neural networks
Nuclear Fusion 61 046024
Mark D. Boyer and Jason D. Chadwick
project PDF IOPscience poster slides
We develop a neural network to accurately predict cross-sectional shapes of plasma density and pressure on the NSTX-U fusion reactor. The network runs orders of magnitude faster than existing physics-based code.


project live web game code
A 2D platformer game where the player can slow and reverse the flow of time to solve increasingly complex puzzles. Inspired by the game Portal and the movie Tenet. A live web version is hosted on this site. Made with Unity and C#.
project code
A board game consisting of hexagonal tiles, with each tile corresponding to a qubit. Players take turns applying quantum operations to the board to try to steer the collective board state to their target state. Graphical edition coming soon!
Cosmic string loops
In the summer of 2019, I worked with Ken Olum at the Tufts Institute of Cosmology to study the properties of smooth cosmic string loops. I began the summer running computational simulations of cosmic strings and later transitioned to working on a mathematical proof that smooth cosmic string loops will always decay.


Explainer: Quantum optimal control for qudits
A brief background explanation for my work with qudit quantum control.
Last Minute
concert video (YouTube)
In my junior year of undergrad, some friends and I created a makeshift band to fill an open spot in CMU's annual Spring Carnival. Because we formed the band two weeks before the show date, we chose the fitting name "Last Minute". I'm all the way on stage left playing rhythm guitar!