Really excited about our new paper on quantum belief propagation (aka "belief propagation with quantum messages")! arxiv.org/abs/2509.19441 Our new quantum algorithm solves a structured state discrimination problem which is central for quantum algorithm based on Regev's reduction (like DQI). 1/3

Can ChatGPT help with research? Maybe not yet for finding new results, but it can certainly speed up some tedious tasks. An example about quantum Tanner codes #qLDPC Working with qudits (d=5) lets you use nice local codes [4,2,3]_5. Then the idea is simply to enumerate small groups and (1/4)

New paper out ✨ Fault-tolerant Transformation of Spacetime Codes, a collaboration w/ @vasmer.bsky.social, Austin Daniel & Ilan Tzitrin, which started during my internship @xanaduai.bsky.social scirate.com/arxiv/2509.0... Let's now see if I can summarize 101 pages (🙈) in a few tweets (and memes!)

I've had a great time at the Stable Phases program at the Kavli Institute for Theoretical Physics! I'm looking forward to being back in Paris but I will miss the SoCal weather ☀️

Looking for a postdoc to work on bosonic quantum error correction! Join me and the QAT team at ENS & INRIA Paris — flexible start date. Details here 👉 recrutement.inria.fr/public/class... or feel free to reach out!

The QEC25 conference hosted by @yaleqi.bsky.social was really excellent, and videos of all talks are available. So much recent progress on quantum error correction! qec25.yalepages.org

Since search is dead, how soon do you think Google Scholar is headed for the Google Graveyard? I'm betting it's soon, and academia is NOT prepared

Very exciting announcement, the next Quantum Error Correction conference QEC26 will be hosted by Google 7-12 June 2026 in Santa Barbara. See you there! @dripto.bsky.social @mattmcewen.bsky.social

I am attending the QEC conference at Yale this week. Looking forward to seeing some interesting talks, catching up with old friends, and eating som New Haven pizza!

#Quantum #QIP2025 The team @qip2025.bsky.social has uploaded the QIPv2025 talks www.youtube.com/@QIP2025 Enjoy rewatching your favorites!

After 3 1/2 years of work my course on quantum computing is finally finished — the "Director's Cut" of Understanding Quantum Information and Computation is now available. arxiv.org/abs/2507.11536

On July 17-18 a small symposium "Dreams of Quantum" will be held in honor of David DiVincenzo's work and retirement at RWTH Aachen. The event can be attended via Zoom by all. Information about the program of speakers & the Zoom link can be found at www.quantuminfo.physik.rwth-aachen.de/cms/~bmmwed

Paul Hilaire and I are recruiting a PhD student to work on demonstrations of fault-tolerant protocols for near-term quantum hardware (photonics & cold atoms). The focus is on quantum error correction, low-overhead schemes, and actual implementation on hardware

One of the amazing things about working in quantum information science is being able to meet and talk to the pioneers of the subject. I was very lucky not only to have met Ray, but also to have been a postdoc in his group for a number of years.

#newpaper Bosonic codes have a huge potential to reduce the cost of quantum fault tolerance, and many codes look like serious contenders: dual-rail qubit, cat qubit, GKP. But the Fock space is huge, esp. if you consider multimode encodings, and there are many great codes waiting to be found (1/4)

Technical question: does anyone know of formal results on the hypergraph (or tensor) product of two CSS codes? I am especially interested in lower bounds on the distance of the product code.

I have a new paper out: "Quantum Circuit Lower Bounds in the Magic Hierarchy".🔮🪜 arxiv.org/abs/2504.19966 a thread:

Happy World Quantum Day! I'm excited to announce that I will be starting a new group dedicated to quantum error correction (QEC) at The University of Edinburgh Quantum Software Lab, funded by an EPSRC Quantum Technology Career Acceleration Fellowship!

Congratulations Christophe, I am very excited to work with you in the near future!

Hey all! Just uploaded my PhD thesis on the arXiv, which I recently defended in January. Feel free to check it out! 🤗 arxiv.org/abs/2503.21773 It's about quasiprobabilistic algorithms to simulate quantum circuits - not just on classical computers, but also on restricted quantum computers. (1/4)

I wonder if the early pioneers of classical fault-tolerance ever imagined where the field might go ieeexplore.ieee.org/document/677...

I will be at QIP this week in Raleigh. Looking forward to catching up with everyone and seeing some interesting talks and posters!

I’m super excited to see the experimental realization of a variant of the dissipatively stabilized squeezed cat that we proposed! Congrats to Alice & Bob and everyone else involved Especially great to see that it comes with similar performance gains as promised by the theory arxiv.org/abs/2502.07892

This week I have been lucky to be in Marseille for a workshop on quantum error correction. Thanks to Benjamin Audoux for organising!

The online QASAR seminar will be restarting soon! The scope includes everything related to fault-tolerant quantum computation or quantum error correcting codes. Contact @vasmer.bsky.social or me if you have a talk you want to give. Also if there is a result you really want to hear about let us know!

Soon, @christophe.vuillot.info and I will be restarting the online QASAR seminar series on quantum error correction! Please let me know if you would like to give a talk :)

Geometry question of the day: What 4D shape is this a 3D projection of?

I am happy to share that I recently started a new position at Inria Paris :)

I'm hiring a postdoc to work with me at the University of Illinois Urbana-Champaign! For details and how to apply, visit felixleditzky.info/postdoc2024.... Applications received by January 10 (AoE) will receive full consideration. Please share!

One of the perks of Perimeter Institute: fireside chats! (featuring Alex Kubica)

It's happening, right? 🧪

Fall colours near Toronto this weekend 🍃🍂🍁

Do you want to correct a quantum code? Do you like tensor networks? Do you live in 3D? Well I have the paper for you! scirate.com/arxiv/2310.1...