Christophe Vuillot
@christophe.vuillot.info
Researcher in quantum error correction and fault-tolerant quantum computation (Alice&Bob, Paris, France). He/Him
Can cat-qubits get away with only ever using (concatenated) classical codes? @pshanahan62.bsky.social and @diego-ruiz.bsky.social investigate and suggest yes! #quantum ⚛️ 🧪
Diego Ruiz@diego-ruiz.bsky.social · 7mo agoNew preprint out with @pshanahan62.bsky.social! We introduce a new error-correcting code for biased-noise qubits. Built from the concatenation of two classical codes, it outperforms the surface and XZZX codes when the noise bias exceeds 7x10^4. arxiv.org/abs/2601.10786
New preprint out with @pshanahan62.bsky.social! We introduce a new error-correcting code for biased-noise qubits. Built from the concatenation of two classical codes, it outperforms the surface and XZZX codes when the noise bias exceeds 7x10^4. arxiv.org/abs/2601.10786
Elevator Codes: Concatenation for resource-efficient quantum memory under biased noise
Biased-noise qubits, in which one type of error (e.g. $X$- and $Y$-type errors) is significantly suppressed relative to the other (e.g. $Z$-type errors), can significantly reduce the overhead of quant...
arxiv.org
We did some experimental testing of magic state cultivation! arxiv.org/abs/2512.13908 A ~1e-4 end2end infidelity is tricky to measure with tomography, so we checked it vs more cultivation. The full escape stage is too wide for the chip, but we did try ending in the grafted code.
This morning my ChatGPT quota was inexplicably exhausted. It took a while but I pieced it together. Voice mode somehow got activated when I went to bed. The bot then engaged in a 10 hour conversation with my snoring dog, answering questions the pup wasn’t asking and praising him for his insight.
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!)
Hi, I am here! Will mostly post about Quantum Foundations/Computing and Quantum Music.
Color code decoding with some big claim: arxiv.org/abs/2508.15743 I wish they could try to benchmark this decoder against the experimental color code data from arxiv.org/pdf/2412.14256 zenodo.org/records/1423... We are releasing experimental data so people can try out their decoding algorithms!
Colour Codes Reach Surface Code Performance using Vibe Decoding
Two-dimensional quantum colour codes hold significant promise for quantum error correction, offering advantages such as planar connectivity and low overhead logical gates. Despite their theoretical ap...
arxiv.org
In closing of #qec2025, we have put up our 1000th code -- the [[8,3,2]] surface code on a cube (aka the Landahl plucky code)! It is a non-CSS code different from the smallest interesting color code. Stabilizer generators are X, Y, or Z strings on the faces. errorcorrectionzoo.org/c/cubic_surf...
\([[8,3,2]]\) Surface code on a cube
An [[8,3,2]] twist-defect surface code whose qubits lie on the vertices of a cube. It is obtained by three-coloring the faces of a cube and placing X, Y, and Z stabilizer generators on each pair of fa...
errorcorrectionzoo.org
Probably the last paper of my PhD! We show that biased-noise qubits can greatly reduce the cost of magic state preparation With high noise bias, just 53 qubits and ~10 error correction cycles are enough to prepare a magic state with logical error≈1e-7 arxiv.org/abs/2507.12511
Unfolded distillation: very low-cost magic state preparation for biased-noise qubits
Magic state distillation enables universal fault-tolerant quantum computation by implementing non-Clifford gates via the preparation of high-fidelity magic states. However, it comes at the cost of sub...
arxiv.org
Le Palais de la découverte a besoin de soutient ! C'est un musée des sciences vraiment réussi et pour tous les âges ! 👉 chng.it/SzH6WkfXH2 ⚛️🧪
Signez la pétition
Sauvons le Palais de la découverte
chng.it
High-performance local automaton decoder for defect matching in 1D, happy to share that our new work in with Anthony Leverrier, Mazyar Mirrahimi and @christophe.vuillot.info is now available on the arXiv ! 👀 (1/6)
🧪⚛️🧮
Riverlane@riverlane.com · last yr.We’d love to find more #QEC experts here on BlueSky and have created this starter pack to help connect the error correction community. It’s just a start – if you’re working QEC, please follow this account and message us. We’ll happily add you to the pack! go.bsky.app/RiZfVco 🧪 🧵[2/2]
So here it is, my first first-author paper is live on the arXiv arxiv.org/abs/2505.01370
Engineering CSS surgery: a fault-tolerant CNOT for any CSS codes
We introduce a framework for implementing logic in CSS-style quantum error correction codes, building on the surgery methods of Cowtan and Burton [CB24]. Our approach offers a systematic methodology f...
arxiv.org
Anyone who can spare an invite to the "global economy dump and pump" signal group chat?
Yes, thanks to @arrr.de and the German National Library of Science and Technology in Hannover (TIB, www.tib.eu) :) bsky.app/profile/arrr...
Henrik Wilming@arrr.de · last yr.I have a positive update regarding this matter: The German National Library of Science and Technology in Hannover (TIB, www.tib.eu) confirmed that they will download and archive the entire arxiv.org as a safety measure.
Quantum is interesting because it is making a transition from one of culture to another. (Has made?) But we can still fight to keep quantum weird!
Michael Nielsen@michaelnielsen.bsky.social · last yr.A friend was telling me recently about getting together with lots of old-time quantum computing folks. They all work for companies now, and could only talk much more guardedly and broadly than in former times
In 1h (9am PST or 5pm CET) I will give a talk at the QASAR seminar hosted by @vasmer.bsky.social and @christophe.vuillot.info . I will present our work on implementing 3coupler, walking and iSWAP surface codes!
Two talks of Alice&Bob QEC team in parallel this morning: @diego-ruiz.bsky.social presented his new results on distillation with biased-noise qubits: with bias=30 he already gets 150x reduction! I talked about implementing rotor codes So many fun subjects to work on, join our team we are hiring!🐱
I'll be at the @apsphysics.bsky.social March Meeting next week in Anaheim. I have a talk on Friday about quantum rotor codes, protected superconducting qubits and tiger codes in the advances in quantum error correction session. Also come talk to me whenever!
Christophe Vuillot@christophe.vuillot.info · last yr.The QEC team at Alice & Bob is hiring ! Come work with me on 🐈 cat codes, 🐅 tiger codes, decoding, biased-noise, distillation, LDPC codes, ... 👇 jobs.lever.co/alice-bob/c0...
The QEC team at Alice & Bob is hiring ! Come work with me on 🐈 cat codes, 🐅 tiger codes, decoding, biased-noise, distillation, LDPC codes, ... 👇 jobs.lever.co/alice-bob/c0...
Alice & Bob - Staff QEC Research Scientist
The Quantum Error Correction (QEC) team at Alice & Bob is tasked with continuously improving the fault-tolerant architecture by finding innovative ways to reduce the need for and cost of fault toleran...
jobs.lever.co
First realization of a dissipatively stabilized squeezed cat qubit (a slight variation that we called a moon cat 🌛 actually), it was super interesting to work on this with experimentalists! arxiv.org/abs/2502.07892 My two key takeaways ⬇️⬇️
Enhancing dissipative cat qubit protection by squeezing
Dissipative cat-qubits are a promising architecture for quantum processors due to their built-in quantum error correction. By leveraging two-photon stabilization, they achieve an exponentially suppres...
arxiv.org
Our fourth and final tutorial of QIP 2025 is by Dakshita Khurana from UIUC about Quantum Cryptography and TCS (Sun Feb 23, 2-5:30pm, Room 302ABC). Overview below!
Our third tutorial of QIP 2025 is “Quantum error correction: a guided tour" by Victor Albert (@vva.bsky.social) from NIST and QuICS, who will gently introduce and visit increasingly important corners of the mega-field of QEC (Sun Feb 23, 9am-12:30pm, Room 302ABC). Overview below:
Our second tutorial of QIP 2025 is by Hsin-Yuan (Robert) Huang from #Google Quantum AI on Quantum Learning and Certification (Feb 22 Sat, 2-5:30pm, Room 302ABC). Overview below:
QIP 2025 is fast approaching! And we have exciting tutorials lined up on Feb 22-23 (Sat-Sun) right before the conference! First in line, we have Cambyse Rouzé from #inria, whose tutorial will cover Quantum Gibbs Sampling (9am-12:30pm, Room 302ABC).
Happy to share our work with @anthony-leverrier.bsky.social, @christophe.vuillot.info, Jérémie Guillaud and Mazyar Mirrahimi on the LDPC-cat architecture was published in Nature Communications! Thanks to the reviewers for their useful feedback www.nature.com/articles/s41...
LDPC-cat codes for low-overhead quantum computing in 2D - Nature Communications
Implementing full quantum error correction incurs a significant hardware overhead. Here, the authors propose a quantum computing architecture combining superconducting cat qubits with 2D local LDPC co...
nature.com
🧪 ⚛️ #quantum
Victor V. Albert@vva.bsky.social · 2y agoRe federal funding freeze from UMD: "The university has not received overarching stop-work orders or suspension notices. Work on grants and cooperative agreements should continue ... unless the Office of Research Administration (ORA) has provided other guidance."
Super happy to see our work on the LDPC cat architecture published! What's not to love about cat qubit and LDPC codes? Great collaboration with @diego-ruiz.bsky.social @christophe.vuillot.info Jérémie Guillaud and Mazyar Mirrahimi rdcu.be/d7wtt
LDPC-cat codes for low-overhead quantum computing in 2D
Nature Communications - Implementing full quantum error correction incurs a significant hardware overhead. Here, the authors propose a quantum computing architecture combining superconducting cat...
rdcu.be
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!