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...

TU Vienna has an interesting tenure-track faculty opening: Deadline May 14, start of position on June 1. I wonder how they'll find someone that quickly. 🙄 jobs.tuwien.ac.at/Job/266522

Gave a talk at the University of Vienna today, in a room once used by the great logician Kurt Gödel! However, my treatment of the subject - holographic fault tolerance - remains incomplete.

Why does this charging station remind me of a certain American president?

It's not often that I do breaking news! Today, Charles Bennett and Gilles Brassard received the Turing Award for helping lay the foundations of quantum information science. Read more in @quantamagazine.bsky.social!

Quantum Cryptography Pioneers Win Turing Award | Quanta Magazine

Charles Bennett and Gilles Brassard were recognized for their foundational work in quantum information science.

quantamagazine.org

Berlin's pubs are already adjusting to new geopolitical realities: "Beer now cheaper than gasoline - Don't drive away, drink and stay!"

If you are interested in doing a postdoc with me, please apply to the IQC postdoctoral fellowship here: iqc-uwaterloo.slideroom.com#/login/progr...

(I/III) We're excited to announce a new tenure track opening! The position is called 'quantum informatics' and is affiliated with our QUICK group within the CS+AI division at @jku.at 🇦🇹. Application deadline is November 30th, 2025: www.jku.at/en/the-jku/w...

This week, we're in beautiful Kraków for a conference on tensor networks and all their applications. My PhD students Dimitris and Lev already gave amazing talks about discrete-holographic boundary symmetries and von Neumann algebras in holographic codes!

You can tell that the #QIP2026 deadline has not yet passed, since @zoltanzimboras.bsky.social has not given word on his submission yet.

Postdoc job! I expect to have an opening at Johns Hopkins for a postdoctoral researcher working somewhere in the broad realms of physics, philosophy, and complexity. Apply at Academic Jobs Online: academicjobsonline.org/ajo/jobs/30496

Looking for a postdoc to work on bosonic quantum error correction! Join me and the QAT team at ENS & INRIA Paris — flexible start date. Details here 👉 recrutement.inria.fr/public/class... or feel free to reach out!

Very happy to have this paper with @jenseisert.bsky.social and his PhD student Shozab Qasim out on the @arxiv.bsky.social! It achieves something that, until recently, I thought to be impossible: To use random tensor networks to study holographic *dynamics*.

Jens Eisert@jenseisert.bsky.social · 12mo ago

Random #tensornetworks provide a powerful framework for probing and understanding complex quantum systems, especially in regimes where conventional tools fail. Here, we rigorously investigate dynamical properties of holographic toy models. scirate.com/arxiv/2508.1...

They've obviously been best friends for years, I don't know why this is so hard for the media to acknowledge.

The Bulwark@thebulwark.com · 12mo ago

Trump claps for Putin as he arrives in Alaska.

At least Chamberlain got a piece of paper

Back from an exciting week visiting the great @zoltanzimboras.bsky.social in Budapest! As you can see, I was also very busy pensively staring at Platonic solids at the Hungarian National Museum.

A second Quantum paper within three weeks! We show how to construct a class of qubit "Evenbly codes" - toy models of holography at finite N - which turn out to be highly tunable subsystem codes that can be made resilient against different types of quantum noise. Why "Far from Perfect"? Well...

Quantum [Unofficial]@quantum-journal.org.web.brid.gy · 12mo ago

Even before being replaced by AI, the jobs of American comedians have apparently been made obsolete.

The first paper with my PhD student Dimitris Saraidaris is now published in Quantum! We explore the symmetries of discrete-holographic models and find that they generically produce critical phases in spin systems - but only when the symmetries describe a "dual" bulk geometry!

Quantum [Unofficial]@quantum-journal.org.web.brid.gy · last yr.

I am looking for a PhD student to explore quantum advantage with indistinguishable particles in my group at CTP PAS, Warsaw (within Quantera TouQan project touqan.eu). 4‑yr scholarship, start  Oct 2025. Apply by 8 Aug 2025: euraxess.ec.europa.eu/jobs/360583

We should be more understanding: Grok initially wanted to be an image-generation AI, but then it was rejected by Midjourney Inc.

Very proud of my PhD student Lev Shaposhik for winning a poster prize at QIQG25 at @perimeterinstitute.ca! He's the main driver behind our work on von Neumann algebras in infinite tensor networks from April, see thread below.

Alexander Jahn@physicistalex.bsky.social · last yr.

Von Neumann algebras have had a recent comeback in holographic dualities: The type of a boundary (sub-)algebra reveals properties of their bulk dual. In our new work, we show that limits of tensor network codes lead to very similar algebraic structures! arxiv.org/abs/2504.00096

POV: You think you're attending a quantum gravity conference, but it's just a Lenny Susskind birthday party in disguise.

Alexander Jahn@physicistalex.bsky.social · last yr.

At Perimeter Institute in Waterloo for QIQG25 this week! Lenny Susskind started his opening talk on de Sitter holography in classic Lenny Susskind style: "Hello children."

At Perimeter Institute in Waterloo for QIQG25 this week! Lenny Susskind started his opening talk on de Sitter holography in classic Lenny Susskind style: "Hello children."

At least there's still one geopolitical certainty under Trump: WW3 will never start on a stock trading day.

Open position at QuSoft / University of Amsterdam: Assistant Professor in Quantum Computing and Simulation for Quantum Chemistry and Materials qusoft.org/qusoft-vacan... Deadline: 14 July 2025

After the success of #Andor, there's only one logical direction for Disney to take the Star Wars franchise: A two-hour ASMR video of Ben Mendelsohn saying "Deep-substrate Foliated Kalkite".

"Where is the Lagrangian, Donald?"

Sean Carroll@seanmcarroll.bsky.social · last yr.

I think Elon and Trump need to go on Piers Morgan and have a civilized discussion

An article in the leading daily newspaper @tagesspiegel.de on #Berlin as a place for doing good research on quantum science and technology. And what BERLIN QUANTUM and several other initiatives have to do with it. www.tagesspiegel.de/themenspezia...

Palo Alto in Dahlem?: Berlin auf dem Weg zur Quantenmetropole

Die Initiative „Berlin Quantum“ nimmt Fahrt auf und will komplexe Quantenwelt besser nutzbar machen – mit jeder Menge Drittmitteln im Rücken.

tagesspiegel.de

My talk on fault-tolerant universal gates with holographic codes, recorded last month in Kyoto, is now online: m.youtube.com/watch?v=z5DY...

Alexander Jahn - Universal Fault-Tolerant Logic with Heterogeneous Holographic Codes

YouTube video by YITP Quantum Error Correction Workshop

m.youtube.com

Alexander Jahn@physicistalex.bsky.social · last yr.

We have another exciting paper coming out today: We show that - surprisingly - holographic codes can be used to run universal logical gates *fault-tolerantly*. Why is that surprising? Well... arxiv.org/abs/2504.10386