Christophe Vuillot
@christophe.vuillot.info
Researcher in quantum error correction and fault-tolerant quantum computation (Alice&Bob, Paris, France).
He/Him
He/Him
Reposted by Christophe Vuillot
Con-cat-enated
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 ⚛️ 🧪
@pshanahan62.bsky.social and @diego-ruiz.bsky.social investigate and suggest yes!
#quantum ⚛️ 🧪
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
arxiv.org/abs/2601.10786
January 19, 2026 at 4:16 PM
Con-cat-enated
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 ⚛️ 🧪
@pshanahan62.bsky.social and @diego-ruiz.bsky.social investigate and suggest yes!
#quantum ⚛️ 🧪
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
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
January 19, 2026 at 4:03 PM
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 ⚛️ 🧪
@pshanahan62.bsky.social and @diego-ruiz.bsky.social investigate and suggest yes!
#quantum ⚛️ 🧪
Reposted by Christophe Vuillot
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
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
January 19, 2026 at 3:17 PM
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
arxiv.org/abs/2601.10786
Reposted by Christophe Vuillot
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.
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.
December 17, 2025 at 6:44 AM
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.
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.
Reposted by Christophe Vuillot
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.
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.
October 18, 2025 at 9:04 AM
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.
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.
Reposted by Christophe Vuillot
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!)
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!)
September 13, 2025 at 11:05 AM
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!)
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!)
Reposted by Christophe Vuillot
Hi, I am here! Will mostly post about Quantum Foundations/Computing and Quantum Music.
September 1, 2025 at 9:48 AM
Hi, I am here! Will mostly post about Quantum Foundations/Computing and Quantum Music.
Reposted by Christophe Vuillot
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!
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
August 22, 2025 at 11:41 PM
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!
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!
Reposted by Christophe Vuillot
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
August 15, 2025 at 6:00 PM
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...
Reposted by Christophe Vuillot
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
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
July 18, 2025 at 2:39 PM
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
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
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
⚛️🧪
👉 chng.it/SzH6WkfXH2
⚛️🧪
Signez la pétition
Sauvons le Palais de la découverte
chng.it
June 14, 2025 at 11:52 AM
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
⚛️🧪
👉 chng.it/SzH6WkfXH2
⚛️🧪
Reposted by Christophe Vuillot
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)
May 16, 2025 at 10:00 AM
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)
🧪⚛️🧮
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]
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]
Riverlane's Quantum Error Correction Pack
Join the conversation
go.bsky.app
May 13, 2025 at 9:41 PM
🧪⚛️🧮
Reposted by Christophe Vuillot
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
May 5, 2025 at 1:36 PM
So here it is, my first first-author paper is live on the arXiv arxiv.org/abs/2505.01370
Anyone who can spare an invite to the "global economy dump and pump" signal group chat?
April 9, 2025 at 9:02 PM
Anyone who can spare an invite to the "global economy dump and pump" signal group chat?
Reposted by Christophe Vuillot
Yes, thanks to @arrr.de and the German National Library of Science and Technology in Hannover (TIB, www.tib.eu) :)
bsky.app/profile/arrr...
bsky.app/profile/arrr...
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.
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.
April 9, 2025 at 9:51 AM
Yes, thanks to @arrr.de and the German National Library of Science and Technology in Hannover (TIB, www.tib.eu) :)
bsky.app/profile/arrr...
bsky.app/profile/arrr...
Reposted by Christophe Vuillot
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!
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
April 4, 2025 at 4:46 AM
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!
Reposted by Christophe Vuillot
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!
March 26, 2025 at 3:05 PM
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!🐱
@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!🐱
March 21, 2025 at 7:47 PM
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!🐱
@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!
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!
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...
👇
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
March 15, 2025 at 1:19 PM
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!
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!
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...
👇
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
March 11, 2025 at 2:43 PM
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...
👇
jobs.lever.co/alice-bob/c0...
Reposted by Christophe Vuillot
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 ⬇️⬇️
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
February 14, 2025 at 4:36 PM
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 ⬇️⬇️
arxiv.org/abs/2502.07892
My two key takeaways ⬇️⬇️
Reposted by Christophe Vuillot
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!
February 12, 2025 at 5:13 PM
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!
Reposted by Christophe Vuillot
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:
February 12, 2025 at 5:11 PM
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:
Reposted by Christophe Vuillot
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:
February 11, 2025 at 9:02 PM
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: