Fun twist in Google's zero knowledge proof of quantum circuit.

Día Mundial de la Cuántica: estado actual, retos y perspectivas de la computación cuántica En el Día Mundial de la Cuántica, celebramos los logros de la primera revolución cuántica y miramos a la computación cuántica como el motor de la nueva era que empieza.

En el #DíaMundialdelaCuántica celebramos los logros de la primera revolución cuántica y miramos a la computación cuántica como el motor de la nueva era que empieza. ✍️  @katutxakur.bsky.social (@unav.edu) 

Noise mitigation of quantum observables via learning from Hamiltonian symmetry decays We present a new quantum error mitigation technique (QEM), called GUiding Extrapolations from Symmetry decayS (GUESS), which exploits Hamiltonian symmetries to improve accuracy of noisy quantum comput...

The GUESS quantum error mitigation method leverages Hamiltonian symmetries to improve accuracy and reduce variance in noisy quantum computations, achieving around 10% relative error for circuits with up to 8000 CZ gates.
@joanafrx.bsky.social, @katutxakur.bsky.social
arxiv.org/abs/2603.13060

Javier Oliva del Moral, Olatz Sanz Larrarte, Joana Fraxanet, Dmytro Mishagli, Josu Etxezarreta Martinez
Noise mitigation of quantum observables via learning from Hamiltonian symmetry decays
https://arxiv.org/abs/2603.13060

Check out our latest preprint on quantum error mitigation. The meme summarizes the work.
scirate.com/arxiv/2603.1...

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.

‘Don’t go to the US – not with Trump in charge’: the UK tourist with a valid visa detained by ICE for six weeks Karen Newton was in America on the trip of a lifetime when she was shackled, transported and held for weeks on end. With tourism to the US under increasing strain, she says, ‘If it can happen to me, i...

Scientific conferences must not be held in the US until it is safe to travel there.

www.theguardian.com/us-news/2026...

The Pinnacle Architecture: Reducing the cost of breaking RSA-2048 to 100 000 physical qubits using quantum LDPC codes The realisation of utility-scale quantum computing inextricably depends on the design of practical, low-overhead fault-tolerant architectures. We introduce the \textit{Pinnacle Architecture}, which us...

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.

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).

Classical solution of the FeMo-cofactor model to chemical accuracy and its implications The main source of reduced nitrogen for living things comes from nitrogenase, which converts N2 to NH3 at the FeMo-cofactor (FeMo-co). Because of its role in supporting life, the uncertainty surroundi...

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?

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"Antonio de Marti i Olius, premio GEITC a la mejor tesis doctoral en información y tecnologías cuánticas". #cuantica2025 www.cuantica2025.es/antonio-de-marti-i-olius...

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…

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...

Quantum Spain Seminar: Advances in low-overhead quantum error correction YouTube video by Quantum Spain

📺 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...

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"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.

From virtual Z gates to virtual Z pulses Virtual $Z$ gates have become integral for implementing fast, high-fidelity single-qubit operations. However, virtual $Z$ gates require that the system's two-qubit gates are microwave-activated or nor...

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!

An almost-linear time decoding algorithm for quantum LDPC codes under circuit-level noise Fault-tolerant quantum computers must be designed in conjunction with classical co-processors that decode quantum error correction measurement information in real-time. In this work, we introduce the ...

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

Minimal state-preparation times for silicon spin qubits - npj Quantum Information npj Quantum Information - Minimal state-preparation times for silicon spin qubits

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.