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Reposted by Michael Vasmer

Christophe Piveteau @christophepiveteau.bsky.social · 13d

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).

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Efficient and optimal quantum state discrimination via quantum belief propagation

We present an efficient quantum algorithm for a structured state discrimination problem we call the subspace decoding task. Building on this, we show that the algorithm enables efficient and optimal d...

arxiv.org

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Reposted by Michael Vasmer

anthony-leverrier.bsky.social @anthony-leverrier.bsky.social · 20d

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)

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Reposted by Michael Vasmer

Arthur Pesah @arthurpesah.bsky.social · 25d

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!)

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Michael Vasmer @vasmer.bsky.social · Sep 5

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 ☀️

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Reposted by Michael Vasmer

Francesco Arzani @frarzani.bsky.social · Aug 26

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!

Post-Doctoral Research Visit F/M Senior postdoctoral researcher in bosonic quantum error correction

Offre d'emploi Inria

recrutement.inria.fr

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Reposted by Michael Vasmer

John Preskill @preskill.bsky.social · Aug 17

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

QEC25

qec25.yalepages.org

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Reposted by Michael Vasmer

Hannah Shelley, MLIS (Metadata, Lattes & Impostor Syndrome) @hannahshelley.bsky.social · Aug 13

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

Google Scholar Is Doomed

Academia built entire careers on a free Google service with zero guarantees. What could go wrong?

hannahshelley.neocities.org

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Reposted by Michael Vasmer

Stephen Bartlett @bartlettquantum.bsky.social · Aug 12

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

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Michael Vasmer @vasmer.bsky.social · Aug 11

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!

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Reposted by Michael Vasmer

kenbrownquantum.bsky.social @kenbrownquantum.bsky.social · Jul 27

#Quantum #QIP2025
The team @qip2025.bsky.social has uploaded the QIPv2025 talks

www.youtube.com/@QIP2025

Enjoy rewatching your favorites!

QIP2025

www.youtube.com

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Reposted by Michael Vasmer

John Watrous @johnwatrous.bsky.social · Jul 16

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

Understanding Quantum Information and Computation

This is a course on the theory of quantum computing. It consists of 16 lessons, each with a video and written component, covering the basics of quantum information, quantum algorithms (including query...

arxiv.org

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Reposted by Michael Vasmer

Barbara Terhal @bterhal.bsky.social · Jul 2

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

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Michael Vasmer @vasmer.bsky.social · Jun 27

More details can be found here quriosity.telecom-paris.fr/files/PhD_PH...

If you're interested, want more information, know someone who might be, or would like to apply (CV + cover letter), feel free to contact us at:
[email protected], [email protected]

quriosity.telecom-paris.fr

Michael Vasmer @vasmer.bsky.social · Jun 27

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

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Michael Vasmer @vasmer.bsky.social · Jun 22

He also taught me that you can be a great scientist and live your life to the full. I remember telling him proudly last year that I had gone on a canoe trip in BC, and his response was that he had recently come back from a canoe trip in the Canadian Arctic!

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Michael Vasmer @vasmer.bsky.social · Jun 22

I will miss his many stories—discovering the 5-qubit code, the genesis of the KLM protocol, adventures with Stephen Hawking—and his sense of humour.

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Michael Vasmer @vasmer.bsky.social · Jun 22

Although he made immense contributions to the field, pioneering both theoretical and experimental quantum error correction, for example, he always wore his accomplishments lightly and showed genuine curiosity in the work of researchers at all levels.

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Michael Vasmer @vasmer.bsky.social · Jun 22

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.

John Preskill @preskill.bsky.social · Jun 21

Raymond Laflamme 1960-2025. A great scientist, renowned for his pioneering contributions to quantum error correction. A great leader, founding director of the Institute for Quantum Computing. A great colleague and teacher whose legacy continues to inspire us.
uwaterloo.ca/institute-fo...

IQC and Waterloo mourn the loss of Raymond Laflamme | Institute for Quantum Computing | University of Waterloo

Raymond Laflamme, a trailblazer in quantum information processing and pioneer of the Institute for Quantum Computing (IQC) at the University of Waterloo, died on June 19 after a lengthy battle with ca...

uwaterloo.ca

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Reposted by Michael Vasmer

anthony-leverrier.bsky.social @anthony-leverrier.bsky.social · May 23

#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)

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Michael Vasmer @vasmer.bsky.social · May 20

Thanks, I'll take a look

Michael Vasmer @vasmer.bsky.social · May 20

I agree that looking at the structure of the logical operators in the product code (given by the Kunneth formula) is a good place to start. But one would also need to show that the weight of these operators can't be further reduced by applying stabilisers.

Michael Vasmer @vasmer.bsky.social · May 20

Thanks for your responses. What I would like is a generalisation of the result in Zeng and Pryadko. Their distance bounds only hold when one of the input chain complexes is length 2 (ie a classical code).

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Michael Vasmer @vasmer.bsky.social · May 19

For context, I think it is well-known that the product of two 2D toric codes gives the 4D toric code. And if the two CSS codes are themselves hypergraph product codes, then we have bounds on all the parameters (see arxiv.org/abs/1805.09271). But I would like to understand the general case 🤔

A theory of single-shot error correction for adversarial noise

Single-shot error correction is a technique for correcting physical errors using only a single round of noisy check measurements, such that any residual noise affects a small number of qubits. We prop...

arxiv.org

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Michael Vasmer @vasmer.bsky.social · May 19

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.

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Reposted by Michael Vasmer

Natalie Parham @nat-parham.bsky.social · Apr 29

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

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