Two permanent teaching jobs in maths/stats and physics/astronomy in my old department at UQ! uq.wd3.myworkdayjobs.com/en-GB/uqcare...

Spent the day at an event mapping out Quantum Physics, Engineering, and Computing research at #USyd. Seeing so many people engaged and eager to collaborate, I feel energized and optimistic: there is a lot of good stuff to be done, and a lot of will to do so!

I am very happy to see our work on non-Clifford gates with 2D non-Abelian topological phases published in PRX journals.aps.org/prx/abstract.... This is definitely among the most exciting projects I have worked on.

Universal Fault-Tolerant Quantum Computation in 2D without Getting Tied in Knots

Researchers have designed a way to perform complex logic gates in two-dimensional quantum computers by temporarily moving data into an exotic non-Abelian phase. This method provides a path toward larg...

journals.aps.org

Towards the end of my PhD, quite a while ago, I was working on extracting the symmetry-enriched topological order that occurs when the gauge charges of a finite group are condensed in a topological phase of matter.

Excited to share our new work led by fantastic undergraduate research student Cassie Hopkin. We show that many translation invariant qLDPC codes can be viewed as compactifications of a single parent fracton code that is local in a higher dimension. arxiv.org/abs/2605.19298 @vva.bsky.social

Translation-invariant quantum low-density parity-check codes from compactified fracton models

Quantum error-correcting codes with translation symmetry and local checks have been studied extensively, leading to a wide variety of fracton codes in three or more dimensions which lack a complete un...

arxiv.org

Very excited to explore new roads to fault-tolerant photonic quantum computation with PsiQuantum! rms.arc.gov.au/RMS/Report/D... @arc-gov-au.bsky.social @sydney.edu.au @psiquantum.bsky.social @bartlettquantum.bsky.social @acdoherty.bsky.social @jcbridgeman1.bsky.social @quantum-roberts.bsky.social

📢 📢 📢 🚨 I am looking for two PhD students to hire in post quantum cryptography. Exciting opportunity to work at University of Sydney @sydneycompsci.bsky.social and the theory/crypto groups here. Do share with your students and contacts. #hiring #phd #pqc #cryptography 🔗 iacr.org/jobs/item/4199

Freshly published in Quantum: Wire Codes by Nouédyn Baspin and Dominic Williamson doi.org/10.22331/q-2...

Wire Codes

Nouédyn Baspin and Dominic Williamson, Quantum 10, 2083 (2026). Quantum information is fragile and must be protected by a quantum error-correcting code for large-scale practical applications. Recently,...

quantum-journal.org

The ARC Centre of Excellence in #Mathematics for #Quantum Era Security and Trust (MathQuEST) is hiring a Chief Operating Officer! 3+ years, based in #Sydney. Or, more succinctly: "we're planning a COO!" Details: usyd.wd105.myworkdayjobs.com/en-GB/USYD_E... More about #MathQuEST: mathquest.edu.au

Chief Operating Officer - MathQuEST

Full time (applicants seeking part-time employment considered), fixed term, initially for 3 years, with possibility of further extension. Located at Camperdown Campus Senior leadership role supporting...

usyd.wd105.myworkdayjobs.com

It's official! The Theory of #Quantum Computation, Communication and Cryptography conference (TQC) 2028 will be held in Sydney, 🇦🇺 Australia, in August'28! tqc-conference.org/2026/2027/ #TQC2028 (TQC 2027 will take place in Grenoble, France)

a white cockatoo with a yellow beak is standing on a brown surface

Alt: a sulphur-crested cockatoo, looking very happy, showing its head

media.tenor.com

Rounding out the hat-trick, a new quantum weight reduction procedure that replaces the qubits and checks of an arbitrary quantum code with patches of surface code which are glued following the connectivity of the original code. arxiv.org/abs/2603.04883 Thanks to my collaborators Andrew & Nouédyn.

New work out today on quantum magic state cultivation with flagged low-depth adaptive circuits that gauge logical Clifford operators. arxiv.org/abs/2603.05429 Thanks Bence and Ben for the fun collaboration.

Here’s an artist’s (Andrew’s) depiction of the parsimonious cone (bottom) vs the old unparsimonious construction (top).

Sunny He@sunnyhe.bsky.social · 5mo ago

Good old code surgery, now more parsimonious than ever. arxiv.org/abs/2603.05082 Joint work with amazing collaborators Andrew Yuan, Alex Cowtan, David Lin, and Dom Williamson.

Some time ago @domwilliamson.bsky.social and I wrote a paper on decoding fracton codes. This gave us the idea to try to extend MWPM decoding to all codes. We didn't get there yet but work led by @kaavyasahay.bsky.social has made great progress showing a matching decoder for bivariate bicycle codes.

Gave a talk recently at Coogee on constructing and analysing spacetime volumes of LDPC codes & surgeries thereof. Thanks to @sunnyhe.bsky.social @domwilliamson.bsky.social and Ted Yoder for the wonderful collaboration. www.youtube.com/watch?v=Lxzw...

Coogee '26 Talks - Alex Cowtan (Xanadu)

YouTube video by Quantum @ Sydney

youtube.com

New work out today with a killer app for our recent fast and fault tolerant logical measurement procedure on quantum codes. Here we apply it to higher-form Clifford gates to prepare many logical magic states in parallel in constant time. arxiv.org/abs/2601.22939

Fast magic state preparation by gauging higher-form transversal gates in parallel

Magic states are a foundational resource for universal quantum computation. To survive in a realistic noisy environment, magic states must be prepared fault-tolerantly and protected by a quantum error...

arxiv.org

I had a great time hosting TOPO2025 this week in Sydney. thanks to all the speakers and our sponsors: sites.google.com/view/topowor...

We are offering 4 PhD scholarships in #physics and #astronomy topics @sydney.edu.au Including: * FRBs with @manishacaleb.bsky.social * Quantum critical points with @domwilliamson.bsky.social * Nanostructured materials with @boriskuhlmey.bsky.social www.sydney.edu.au/scholarships... ⚛️ 🔭 ☄️ 🧪

Physics Foundation Scholarship

A stipend scholarship to support PhD students who are undertaking research within School of Physics, Faculty of Science at the University of Sydney.

sydney.edu.au

Come and join us: we have 2x Postdoctoral Research Associate positions available at SMRI. Mathematicians of all areas are encouraged to apply (pure, applied, statistics). Please share with your network #MathSky Closing December 3 usyd.wd105.myworkdayjobs.com/en-GB/USYD_E...

SMRI Postdoctoral Research Associate

Two (2) Full time, 3 years fixed term opportunities. Located at the Sydney Mathematical Research Institute (SMRI) Opportunity to contribute to research focused on pure or applied mathematics or statis...

usyd.wd105.myworkdayjobs.com

Fault-tolerant logical measurement just got a lot faster! In new work, we show that code surgeries based on hypergraphs, rather than graphs, allow fast and parallel fault-tolerant logical measurements with low qubit overhead (without requiring the code to be single-shot). arxiv.org/abs/2510.14895

That was fun.

Dom Williamson@domwilliamson.bsky.social · 10mo ago

Very happy that I was scheduled to present first today. Talk about a hard act to follow…

Very happy that I was scheduled to present first today. Talk about a hard act to follow…

How do you correct this error in a Layer Code? In new work arxiv.org/abs/2510.09218 we introduce a concatenated matching decoder and show that Layer Codes assisted by this decoder are partially self-correcting quantum memories at finite temperature!

Layer Codes are partially self-correcting: arxiv.org/abs/2510.09218

Dom Williamson@domwilliamson.bsky.social · 11mo ago

Layer codes may not be self-correcting in the strict sense but that isn’t the end of the story. Stay tuned!

Floquet codes fit neatly onto the heavy-hex lattice. In new work out today, we show that making full use of all the heavy-hex qubits allows us to fit two floquet codes at once. We also describe transversal gates and low-depth adaptive circuits to switch to the color code. arxiv.org/abs/2510.05225

📢 Come be my colleague: the School of Computer Science at 🇦🇺 #USyd is hiring! Multiple tenure-track-equivalent positions across the board (including theory!), but with a specific focus on Cybersecurity and Trustworthy Digital Systems, and ML/AI. ⏰ Dec 1 usyd.wd105.myworkdayjobs.com/en-GB/USYD_E...

Multiple Continuing (Tenure-Track) Academic Positions, School of Computer Science, Faculty of Engineering, The University of Sydney

Join a thriving Faculty of Engineering at a University ranked amongst the world’s best teaching and research institutions Located in the heart of Sydney’s bustling inner west quarter, close to beaches...

usyd.wd105.myworkdayjobs.com

Gauging versus dualities: equivalent up to constant depth quantum circuits. arxiv.org/abs/2509.22051

Join us on a journey through the gauging nexus between topological and fracton phases. In this work we show how to pass through a web of dualities between topological, symmetry-protected, and fractonic phases of quantum matter, and back again. arxiv.org/abs/2509.19440

Another fantastic paper by Noédyn Baspin on arxiv today. Introducing the free energy barrier for quantum codes and using it to destroy our dreams of a self-correcting quantum memory in 3D based on existing codes. scirate.com/arxiv/2509.1...

The Free Energy Barrier: An Eyring-Polanyi bound for stabilizer Hamiltonians, with applications to quantum error correction

The lack of an energy barrier in stabilizer Hamiltonians is well known to be an indication of short thermalisation times; and serves as a simple criteria to rule out self-correction. Its applicability...

scirate.com

Sad news. I had a great time working at IBM Almaden last year. The park that surrounds the campus is amazing.

Thomas Steinke@stein.ke · last yr.

I'm told IBM Almaden will close later this year. The people there will move to a nearby IBM office. It's a beautiful campus with an illustrious 40-year history. I have fond memories from working there 2016-2020.