Frederik Hahn

Best of luck to all of you!

Cryptography used to rely on hardness assumptions. Now it relies on a "bad PR assumption": a cryptosystem is still safe to use since it would be bad PR if AI labs announced how to break it. Pro tip: Given the absence of cryptography problems in the OpenAI release, consider a career in cryptography!

A group of 25 Fields Medalists, including myself, have made a joint declaration on Math and AI: mathandai.org . We welcome additional signatories. See also this article in the Economist announcing the declaration: www.economist.com/science-and-...

"I don’t know if that cat is being fully rational right now." "If you don’t want me to be nice, then I don’t have to be nice." "Why would you ruin your career?" cims.nyu.edu/~tristanb/st...

Announcing the Palomar registry of Lean formalized mathematics: palomar-registry.org . See also my blog announcement at terrytao.wordpress.com/2026/08/18/p... and the Lean Zulip channel at leanprover.zulipchat.com#narrow/chann....

Per popular request, I've extended the application deadline for both postdoc positions to *Aug 19*.

Some initial thoughts, and a complicated mix of feelings. Wow. I mean, Erdos problems are cool (I genuinely mean that), I didn't know about the Jacobian conjecture before it got disproved. But this newest batch from OpenAI hits home in a way the previous announcements did not.

the new reality of QIP: github.com/tobiasosborn...

@dulwichquantum.bsky.social Me when I read "the authors take full responsibility for the content" in a paper's acknowledgments.

I tend to agree with Tobias. It will be interesting to see near-term changes in the valuation of certain aspects of research. An important problem I see is who can afford access to frontier models and how the scientific community should address this. tjoresearchnotes.wordpress.com/2026/07/28/p...

Big news: I'll be moving to APCTP in Pohang, South Korea, starting a new group in October! I'll be hiring two postdocs on a range of topics from high-energy to quantum information theory, collaborating across the Asia-Pacific region and beyond. Deadline Aug 12. More: www.apctp.org/bbs/board.ph...

It's not necessarily the end of mathematics, but it's hard to see how the all the social structures that support the subject will be able to avoid major disruption over the next few years.

🕵️ Speaking out should not cost you your safety. 📽️Our reel below explores how the #QuantumInternet and entanglement could enable truly anonymous whistleblowing. 🔎To know more, register to this webinar with Frederik Hahn from TU Berlin👇 quantuminternetalliance.org/event/quantu...

Whistleblowing is vital, but rarely risk-free ⚠️ Could the #quantuminternet change that? Join this webinar with Frederik Hahn from Technische Universität Berlin tto explore quantum-enabled anonymity, network architectures & real-world potential. 🔗 quantuminternetalliance.org/event/quantu...

@dulwichquantum.bsky.social My first meme abstract! The full paper: arxiv.org/abs/2603.08847 Thank you Rose McCarty, Hendrik Poulsen Nautrup and Nathan Claudet for this fun collaboration :)

Celebrate with us Quantum's approaching 10 year anniversary in 2026 with the publication of the 2026th paper! Do you know which paper that is? quantum-journal.org/2026-quantum...

I am surprised to see this and hope the arXiv stays nonprofit.

In the last post of a 3-part series, Dominik Hangleiter highlights the importance of efficient verification of quantum advantage, and assesses the prospects for achieving it soon. quantumfrontiers.com/2026/02/28/w...

In part 2 or a 3-part series, Dominik Hangleiter continues his thoughtful assessment of the evidence for quantum advantage in random-circuit-sampling experiments. quantumfrontiers.com/2026/01/25/h...

Last year, I became interested in the question what happens if we impose computational efficiency onto information theory. In our latest paper, we analyze how this changes the amount of information that can be transmitted over a channel -- spoiler alert: a lot! scirate.com/arxiv/2601.1...

100% agree. Especially since we have author IDs that are matched to the papers when they are claimed!

Our introductory webinar is now open for registration! ℹ️ Quantum Internet Use Cases: Overview and Status 🎤 Michele Amoretti | QIA Use Case Team Lead and Director of Quantum Software Laboratory at University of Parma 📅 11 February 2026, 15:00-15:30 CET 🔗 meet.zoho.eu/ssbb-fvm-xzm Sign up today!

Dominik Hangleiter weighs in with an informative post about a much debated question: Has quantum advantage been achieved? This is the first post in a three-part series. quantumfrontiers.com/2026/01/06/h...

The largest fundamental science agency in Europe will save €1.4 million annually by breaking free from Clavariate Analytics' huge databases of references and citations. "We have worked for free to lock ourselves collectively into a paid system", one head of the CNRS explains - but no more! 🎉

This comment has a strong guns-don't-kill-people vibe.

PhD position on quantum computing at at ETH Zurich, advised by Dominik Hangleiter and co-advised by Renato Renner www.quantiki.org/position/phd...

🥳I am very happy to have been awarded an ERC Starting Grant that I will use to start my own group and explore the large-scale entanglement properties of complex quantum systems. This would not have been possible without my fantastic collaborators and supervisors. A big "thank you" to all of you! 🙏

I did not expect to learn the difference between eudaimonia and eudaemonia, when I decided to participate in the www.avibagla.com/blueskydicti... challenge today 😅 en.wikipedia.org/wiki/Eudaimo... en.wikipedia.org/wiki/Eudaemo...

I wrote about automation and the meaning of life, as a guest post on Scott Aaronson's Shtetl-Optimized. (1/5) scottaaronson.blog?p=9030

#Quantum #QIP2025 The team @qip2025.bsky.social has uploaded the QIPv2025 talks www.youtube.com/@QIP2025 Enjoy rewatching your favorites!

Are you a student or early-career researcher in quantum computing or quantum information? Then the following is for you. We're organising a focused, community-driven conference at Leibniz Universität Hannover, hosted by Prof. Robert Raussendorf. 🗓️ Save the date: August 27–29, 2025

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

🕵️ Want to blow the whistle without risking your safety? Today, true anonymity online doesn’t exist. But in the future, #QuantumInternet could make it possible. 🎥 Learn how Quantum Whistleblowing works in episode 2 of #EverydayQuantum.

There is now an official announcement: The TIB has archived the current status of the arXiv: blog.tib.eu/2025/05/14/p...

Hi, Bluesky community!👋 We are the Quantum Internet Alliance (QIA), a consortium of ~42 world-leading institutions working together to build a global Quantum Internet made in Europe. Follow us for updates on the work we do! You can also visit our website to know more: quantuminternetalliance.org

Did you know how much of the power generation capacity added each year world-wide was in renewables? 2022 it was 80 % 2023 it was 86 % 2024 it was 92,5 % Not because the whole world suddenly turned „woke“, but because it’s the cheapest!

Wahnsinn. Dieser nie dagewesene Anstieg der CO2-Konzentration in einem Jahr ist jenseits aller Erwartungen und müsste in zig Sondersendungen erörtert werden, wenn wir als Gesellschaft noch bei Trost wären. Müsste... gml.noaa.gov/ccgg/trends/...

This — and has been for a while — an all-hands-on-deck emergency situation for anyone who cares about the welfare of the world.

I'm going to tell you a little story about how the sausage of science journalism is made. You may already know that the big journals - Nature, Science and so on - provide reporters with embargoed copies of papers before they are published. But what exactly does that mean?

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.

On the surface this looks like a huge mistake, but it was most certainly intentional.

Thanks @zlatko-minev.bsky.social and hello bluesky world!

One-meme summary of Microsoft's announcement today.

Am Vormittag den Opfern der Faschisten von gestern gedenken, um am Nachmittag den Faschisten von heute die Hand zu reichen. Ein zutiefst beschämender Tag für dieses Land und für eine Partei, die sich immer noch christlich nennt.

m.youtube.com/watch?v=n_SS... Strong recommendation for anyone interested in current German/European politics. Wichtige Worte über diesen Wahlkampf hinaus.

The best the AI sector could do in terms of saving the climate, our planet, and the future of the citizens of the US would be to redirect those 500 billion USD into renewable energies and not buy a single GPU *sigh* #energy #renewables #ai

Can confirm. Thank you 😎

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