@katutxakur
PhD in Quantum Information. Trying to make quantum computers less noisy. I am a reseacher at Tecnun. Former visitor at the Cavendish Laboratory (Cambridge). Rugby player. Rock&Roll. Opinions are my own.
Cambios en la generación eléctrica en China y EE.UU. entre 2024 y 2025. Un solo año.
Por cierto, detalle, al margen de lo obvio. China es el país del mundo con una apuesta más fuerte por la nuclear.
Scientific conferences must not be held in the US until it is safe to travel there.
www.theguardian.com/us-news/2026...
I've been asked several times to comment on arxiv.org/abs/2602.11457, which claims to reduce the qubit cost of factoring by 10x.
My take is that they demand a *lot* more qubit connectivity for that number. Your mileage depends entirely on how plausible you find those demands.
![Many of the potential applications of Hamiltonian simulation are not algorithms themselves, but
rather, the idea that having a better understanding of certain physical or chemical systems would likely
lead to new scientific and technological breakthroughs. Some of these are well worked out ideas (for
example, nitrogen fixation [RWS+17]), but many of them are very tenuous, which unfortunately does
not stop popular science news, and technology-enthusiasts who have decided to make a career talking
a lot about quantum computing without really understanding it, from treating such applications as
being just around the corner. You will find headlines and ted talks claiming quantum computers can
solve every futuristic-sounding problem, including fixing climate change [mtl], curing cancer [Kak24],
and finding the secret to immortality [Gre20]. I mean, science could solve any of these (but could it?),
and faster Hamiltonian simulation would mean we can do better science, so. . . The reality is, there
probably will be many applications to being able to simulate physical systems, but we do not yet know
what they will be. We will not discuss applications of Hamiltonian simulation in this course, but it
is important to understand that there is a lot of hype around quantum computing, some of which is
justified, and some of which is not.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:tepknacn7qtpcddry35b3g2x/bafkreibcs6y26budwxemzcdm4sxf4ltootd5f76rwvr4efnbebvrc2nm3a)
Many of the potential applications of Hamiltonian simulation are not algorithms themselves, but rather, the idea that having a better understanding of certain physical or chemical systems would likely lead to new scientific and technological breakthroughs. Some of these are well worked out ideas (for example, nitrogen fixation [RWS+17]), but many of them are very tenuous, which unfortunately does not stop popular science news, and technology-enthusiasts who have decided to make a career talking a lot about quantum computing without really understanding it, from treating such applications as being just around the corner. You will find headlines and ted talks claiming quantum computers can solve every futuristic-sounding problem, including fixing climate change [mtl], curing cancer [Kak24], and finding the secret to immortality [Gre20]. I mean, science could solve any of these (but could it?), and faster Hamiltonian simulation would mean we can do better science, so. . . The reality is, there probably will be many applications to being able to simulate physical systems, but we do not yet know what they will be. We will not discuss applications of Hamiltonian simulation in this course, but it is important to understand that there is a lot of hype around quantum computing, some of which is justified, and some of which is not.
Just LOVE the "Advanced Quantum Algorithms" lecture notes of Stacey Jeffery!!!
homepages.cwi.nl/~jeffery/not...
Everyone teaching quantum computing should read this paragraph out loud to their students!
homepages.cwi.nl/~jeffery/not...
Fun fact I learnt preparing my condensed matter lectures for this semester:
Arnold Sommerfeld was nominated 84 times for the Nobel prize in physics, but never won.
Interestingly, despite his lifelong Nobel prize disappointment, Sommerfeld never threatened to invade Greenland (as far as I know).
The promise of solving the electronic structure of FeMo-co has long been central to the narrative that quantum computers will one day solve world hunger. Now we can finally put the "solving world hunger" part to test since Garnet Chan just solved FeMo-co *classically*!
arxiv.org/abs/2601.04621
We recently received a referee report from Phys. Rev. Lett. @apsphysics.bsky.social that was obviously written by generative AI. It is so bizarre to read it; I have never received anything like it before. What measures is @apsphysics.bsky.social taking to ensure the integrity of the review process?
Featured media
"Antonio de Marti i Olius, premio GEITC a la mejor tesis doctoral en información y tecnologías cuánticas". #cuantica2025 https://www.cuantica2025.es/antonio-de-marti-i-olius-premio-geitc-a-la-mejor-tesis-doctoral-en-informacion-y-tecnologias-cuanticas/
I just published: ERC-Plus: jackpot science or missed chance to fix academia?
My reflections on ERC-Plus, Europe’s newest ultra-competitive research grant and what it tells us about the academic culture we’re building.
medium.com/p/erc-plus-j...
📺 We’ve just released the recording of our latest Quantum Spain Seminar on YouTube!
💡 Advances in low-overhead quantum error correction
🗣️ Josu Etxezarreta Martinez , researcher
@tecnun.bsky.social - Universidad de Navarra
Watch it now! www.youtube.com/watch?v=_UW5...
📢 Tomorrow: new Quantum Spain Seminar with Josu Etxezarreta Martinez - @tecnun.bsky.social
Topic: Advances in low-overhead quantum error correction
👉 Register here: events.teams.microsoft.com/event/f76507...
Featured media
"Seminar | Josu Etxezarreta". #cuantica2025 https://www.cuantica2025.es/seminar-josu-etxezarreta/
Dear funding agencies,
I know we all want to discover the wonder drug that will cure the horrible diseases, but to do that, we need to invest in basic, unsexy, foundational research on how the systems work. Funding can’t all be drug development.
Sincerely,
Looking for basic research grants.
Ever wanted to use virtual Z gates with arbitrary powers of SWAP? Introducing the virtual Z pulse: arxiv.org/abs/2509.13453. In our new article, we present a method for distorting a pulse sequence to implement single-qubit Z controls virtually.
I will be presenting a poster about this next week at the QEC25 conference so anyone attending and interested please come check it out!
In the V2 we include updated results for the bivariate bicycle codes, a timing analysis for those, surface code performances and a detailed analysis of the sparsification routine.
You can find the paper here: arxiv.org/abs/2409.01440
Check out the V2 of our qLDPC decoding paper "An almost-linear time decoding algorithm for quantum LDPC codes under circuit-level noise". The meme summarizes our approach. @qec.codes
How fast can quantum processors run? My coauthors and I answer in our new npj Quantum Information article! Utilising pulse engineering, we prepare molecular ground states in a few nanoseconds, ~100× faster than with gates. Back-of-the-envelope: Simulations can now tolerate T₁ and T₂ ~100× smaller.
Hi all! I am excited to finally share this suite of quantum optimal control libraries that run up to 100× faster than QuTiP for some tasks. We developed these libraries while working on our preprint arxiv.org/abs/2406.10913, which was recently accepted into npj Quantum Information—keep tuned!
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I remember getting a $300k grant 10 years ago to perform non-abelian braiding in 2 years
It is funny, but it is also sad. "The people" want miracles from science, right now, and for free. If one is achieved, they move on immediately and just want more, different, fresh like distracted children.
👇
Thanks for sharing! I hope to see more QEC memes around!
An open call for all #QuantumErrorCorrection researchers to now summarise their work in the form of memes please 🙂 - nice work @katutxakur.bsky.social et al (both the paper and meme!)
#QECpapers
Check out our latest preprint! The meme summarizes it.
I'm often asked if I'll redo the 2019 quantum factoring estimate. Denser storage by yokes, smaller magic factories by cultivation, slimmer approx arithmetic by Chevignard et al… surely the cost is lower now?
Yes, it's lower now.
security.googleblog.com/2025/05/trac...
arxiv.org/abs/2505.15917
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]
"By the time we get to million qubits, I will be dead."
--John Martinis
Industry expectations vs actual progress in one of his slides:
Check out our latest preprint: SpinHex: A low-crosstalk, spin-qubit architecture based on multi-electron couplers. scirate.com/arxiv/2504.0...
Estas cosas no hacen más que acentuar la desconfianza de los jóvenes en la carrera académica. Lo que necesitamos son inversiones recurrentes, planificadas y predecibles. 1/