After Q-Day: Quantum Applications at Scale • Matthew Keesan • YOW! 2025

This presentation was recorded at YOW! Australia 2025. #GOTOcon #YOW
https://yowcon.com

Matthew Keesan - VP & GM at IonQ

RESOURCES
https://twitter.com/keesan
https://github.com/mjk
https://www.linkedin.com/in/keesan
https://www.keesan.net

Links
https://plus.maths.org/content/hypersphere-in-4D
https://iontrap.duke.edu/2021/10/19/fault-tolerant-operation-of-a-quantum-error-correction-code
https://www.csiro.au/en/news/All/News/2025/October/Breakthrough-quantum-secure-link-protects-data-using-the-laws-of-physics
https://arxiv.org/abs/2504.08732
https://arxiv.org/abs/2506.22408
https://arxiv.org/abs/2503.13128
https://www.scottaaronson.com/democritus
https://github.com/Munich-Quantum-Software-Stack
https://openqse.org
https://unitary.foundation

ABSTRACT
In the span of one generation, quantum computers have gone from thought experiments to globally deployed commercial products on the verge of becoming a standard tool in high-performance computing (HPC).

Much early motivation in (and funding for) developing practical quantum computers resulted from Peter Shor's discovery of an efficient quantum algorithm for factorization—thereby threatening the RSA encryption standard. If today's quantum computing manufacturers achieve their roadmaps, RSA-2048 will be broken within the next few years. Beyond a sea change for encrypted communications globally, this heralds the arrival of a new era of HPC workflows and the possibility of solving heretofore unsolvable problems.

In this talk, we will discuss the current state of research into what applications might come online first, the nascent ecosystems for delivering them, and the call to action to all developers to prepare for Q-Day and beyond! [...]

TIMECODES
00:00 Intro
00:56 What is Q-Day?
01:18 What is quantum computing?
09:05 How to start worrying about Q-day
20:01 Complexity theory in 100 seconds
20:48 BQP: Bounded-error quantum polynomial time
27:53 Part 1: Quantum AI
30:16 Part 2: Quantum chemistry & materials science
33:20 Part 3: Modeling & simulation
34:05 Part 4: You?
37:45 Outro

Read the full abstract here:
https://yowcon.com/brisbane-2025/sessions/3916

RECOMMENDED BOOKS
Scott Aaronson • Quantum Computing Since Democritus • https://amzn.to/3kSH0nG
Johan Vos • Quantum Computing in Action (available soon) • https://amzn.to/3oj7OQ6
Jack D. Hidary • Quantum Computing: An Applied Approach • https://amzn.to/3kdJ3CK
Sarah C. Kaiser & Christopher Grenade • Learn Quantum Computing with Python and Q# • https://amzn.to/3CgL6f8
Venkateswaran Kasirajan • Fundamentals of Quantum Computing • https://amzn.to/3nzk7aL
Brian Clegg • Quantum Computing: The Transformative Technology of the Qubit Revolution • https://amzn.to/3AcdmiI
William (Chuck) Easttom • Quantum Computing Fundamentals • https://amzn.to/2ZzUUTy
Wolfgang Scherer • Mathematics of Quantum Computing • https://amzn.to/3CXYBRl

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