FTQC HEM3

FTQC Hackathon & Exchange Meeting for 3 days @ The University of Osaka

Organized by Shin Nishio
Research Associate, University College London
Project Assistant Professor, Keio University

Background & Motivation

FTQC theorists are working across different physical-system projects in Moonshot, and there is an opportunity to further promote theoretical research and collaboration across different physical systems, within the Moonshot program and more broadly across Japan. Following the success of the decoder camp held at Kyushu University in February 2026, we will host a hackathon and exchange meeting in Osaka to further facilitate such interactions and bring together FTQC theorist / experimentalist from across the Moonshot program and beyond.

The event will also provide opportunities for interaction and collaboration with observer companies. Participants will utilize software developed through Moonshot projects, such as device-aware compilation tools, noisy-circuit simulators, and resource estimators for FTQC.

The goal of HEM3 is not necessarily to produce a completed implementation during the event. We encourage participants to use the hackathon to identify interesting research questions, develop new formulations, test early ideas, and initiate collaborations that may continue beyond HEM3.

Organizers: Shin Nishio, Dr. Fumiyoshi Kobayashi (Mercari)
Local Organizer: Mr. Nilton Filho

Program

Day 1 — Introduction to each system & software suite tentative

★ connected to Stim

Time	Session	Presenter
10:00	Opening & Discussion: What are the wrong abstractions in current FTQC?	Nishio
10:30	TBA ★ (trapped ion): compiler & noisy circuit sim	Mr. Ishikawa & Mr. Hirai
11:00	Losssim ★: circuit-level loss / erasure sim	Nishio
11:30	TBA (neutral atom) ★: compiler & noisy circuit sim	Dr. Kobayashi
12:00	Lunch and discussion	—
13:30	TBA (superconductor): compiler & noisy circuit sim	Prof. Matsuzaki
14:00	Quration: resource estimator for FTQC	Dr. Suzuki
14:30	VeriQ	Prof. Soeda
15:00	Brainstorming & team forming (if necessary)	Nishio
16:00 –	Happy Hacking!	—

Day 2 — Hacking

13:00-13:30 Mid discussion

Day 3 — Hacking and Presentations

We have a presentation for the hackathon results and hold a dicussion.

What shall we work on?

Hardware-aware something — decoding, resource estimation, compilation, …
Design architecture and criteria
Try your favorite codes on multiple devices
Make simulators faster (especially loss sim is very slow…)
Connect simulators and resource estimator
Program analysis on intermediate representations

Resources

★ connected to Stim

Tool	Description	GitHub Repository
Traqer ★	(QCCD trapped-ion) Compiler & noisy circuit sim	TBA
Losssim ★	Circuit-level loss / erasure sim	TBA
TBA ★	non-Clifford circuit simulator for non-Pauli stabilzer codes	TBA
TBA ★	(neutral atom) Compiler & noisy circuit sim	TBA
TBA	(superconductor) Compiler & noisy circuit sim	TBA
Quration	Resource estimator for FTQC	quration/quration
VeriQ	TBA	TBA

Participants tentative

TBA

Expected attendance: about 20 people (may vary depending on the venue)
We’d like to focus on researchers who can actively participate in hands-on activities
In general, we’ll invite people who are open to future collaborative research and for whom it is administratively feasible
We’ll also invite people who are developing error budgets/simulator for each hardware.

Partial list of participants

RIKEN — Prof. Suzuki, Dr. Ueno
Chuo University - Prof. Matsuzaki
Mercari — Dr. Kobayashi
Keio University — Nishio, Mr. Ishikawa, Mr. Hirai
U Osaka — Mr. Nilton
OIST — Ms. Zen
Qubitcore — Dr. Miyanishi
Let me know if you have any candidates!

Venue tentative

Toyonaka Campus, The University of Osaka

Contact

All details on this page — venue, and participant list — are still tentative. If you’re interested in joining, or have suggestions for participants, tools, or venues, please get in touch.

Shin Nishio — email: parton (at) sfc.wide.ad.jp
parton-quark.github.io