iiinova — where your digital self keeps evolving

Alexander Jahn @physicistalex.bsky.social · 13/08/2026

Politics in Berlin is such a mess that one could call it a... mission impossible?

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Alexander Jahn @physicistalex.bsky.social · 12/08/2026

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

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Alexander Jahn @physicistalex.bsky.social · 12/08/2026

Three years ago, we proposed "overlapping qubits" as a description of information encoding in quantum gravity. In our new paper with Charles Cao's group at @virginiatech.bsky.social, we finally apply overlapping qubits to evaporating black holes! arxiv.org/abs/2608.10085

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Alexander Jahn @physicistalex.bsky.social · 26/07/2026

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...

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Alexander Jahn @physicistalex.bsky.social · 11/05/2026

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

jobs.tuwien.ac.at

Assistant Professorship - Tenure Track

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Alexander Jahn @physicistalex.bsky.social · 13/04/2026

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.

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Alexander Jahn @physicistalex.bsky.social · 25/03/2026

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

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Ben Brubaker @benbenbrubaker.bsky.social · 18/03/2026

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!

quantamagazine.org

Quantum Cryptography Pioneers Win Turing Award | Quanta Magazine

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

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Alexander Jahn @physicistalex.bsky.social · 16/03/2026

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

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Graeme Smith @graemesmith.bsky.social · 06/11/2025

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

iqc-uwaterloo.slideroom.com

University of Waterloo Attn: Institute for Quantum Computing - SlideRoom

Apply to University of Waterloo Attn: Institute for Quantum Computing. Powered by SlideRoom.

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Richard Kueng @richardkueng.bsky.social · 21/10/2025

(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...

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Alexander Jahn @physicistalex.bsky.social · 07/10/2025

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!

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Alexander Jahn @physicistalex.bsky.social · 13/09/2025

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

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Sean Carroll @seanmcarroll.bsky.social · 05/09/2025

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

academicjobsonline.org

Johns Hopkins University, Physics and Astronomy

Job #AJO30496, Postdoctoral Fellow in Foundations of Physics, Complexity, and Emergence, Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland, US

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Francesco Arzani @frarzani.bsky.social · 26/08/2025

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!

recrutement.inria.fr

Post-Doctoral Research Visit F/M Senior postdoctoral researcher in bosonic quantum error correction

Offre d'emploi Inria

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Alexander Jahn @physicistalex.bsky.social · 25/08/2025

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*.

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Alexander Jahn @physicistalex.bsky.social · 16/08/2025

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

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Matt Green @mattgreencomedy.com · 16/08/2025

At least Chamberlain got a piece of paper

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Alexander Jahn @physicistalex.bsky.social · 13/08/2025

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.

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Alexander Jahn @physicistalex.bsky.social · 11/08/2025

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...

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Alexander Jahn @physicistalex.bsky.social · 01/08/2025

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

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Alexander Jahn @physicistalex.bsky.social · 24/07/2025

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!

Building a critical Hamiltonian from a Multi-scale Quasicrystal Ansatz (MQA).

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Michał Oszmaniec @michaloszmaniec.bsky.social · 18/07/2025

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

touqan.eu

Touqan Quantera Project

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Alexander Jahn @physicistalex.bsky.social · 09/07/2025

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

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Alexander Jahn @physicistalex.bsky.social · 27/06/2025

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.

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Alexander Jahn @physicistalex.bsky.social · 25/06/2025

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

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Alexander Jahn @physicistalex.bsky.social · 23/06/2025

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."

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Alexander Jahn @physicistalex.bsky.social · 22/06/2025

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

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Maris Ozols @marisozols.bsky.social · 11/06/2025

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

qusoft.org

QUSOFT Vacancies – Qusoft

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Alexander Jahn @physicistalex.bsky.social · 09/06/2025

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".

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Alexander Jahn @physicistalex.bsky.social · 06/06/2025

"Where is the Lagrangian, Donald?"

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Jens Eisert @jenseisert.bsky.social · 06/06/2025

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...

tagesspiegel.de

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.

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Alexander Jahn @physicistalex.bsky.social · 12/05/2025

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

m.youtube.com

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

YouTube video by YITP Quantum Error Correction Workshop

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Alexander Jahn @physicistalex.bsky.social · 11/05/2025

Prepared a papal dish this Sunday.

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Alexander Jahn @physicistalex.bsky.social · 06/05/2025

I met Friedrich Merz as a PhD student in Berlin, as I was handing out name badges for TQC 2016. He entered the building, looked at me in utter confusion, and then realized the entrance to the "Atlantic Bridge" was one door to the right. Seems like he's a man of successful second attempts.

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Alexander Jahn @physicistalex.bsky.social · 03/05/2025

The incoming chancellor Merz used to be one of Germany's most pro-US politicians. By embracing the AfD, a far-right competitor to Merz's conservative CDU, Trump's administration has alienated yet another ally.

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Alexander Jahn @physicistalex.bsky.social · 30/04/2025

Our website now includes talk recordings by group members and visitors! For example, check out @crossproduct.bsky.social Lev's tutorial on von Neumann algebras from earlier this month, and a talk by DESY's Enrico Brehm on matrix model simulation from March. www.physik.fu-berlin.de/en/einrichtu...

physik.fu-berlin.de

Talks

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Alexander Jahn @physicistalex.bsky.social · 23/04/2025

In the countryside of Kyotango, central Japan.

Cherry blossoms at the top of rice field terraces.

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Alexander Jahn @physicistalex.bsky.social · 23/04/2025

Back in 2021, @jenseisert.bsky.social and I wrote a review on holographic tensor-network codes that just reached 100 citations! Glad to see this field being of interest to a growing crowd. Perhaps we'll soon need to write an updated version? arxiv.org/abs/2102.02619

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Alexander Jahn @physicistalex.bsky.social · 15/04/2025

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

Different types of heterogeneous holographic codes

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Alexander Jahn @physicistalex.bsky.social · 13/04/2025

A benefit of visiting Japan is that you can watch peak Japanese cinema on their local Amazon, a wide range of classics such as: "Godzilla" (1954) "Mothra" (1961) "King Kong vs. Godzilla" (1962) "Mothra vs. Godzilla" (1964)

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Alexander Jahn @physicistalex.bsky.social · 10/04/2025

In Kyoto for a quantum error correction workshop, giving a talk on exciting upcoming work on holographic codes next week! (Didn't even use AI for this picture, this is how Japan looks like once you pass through immigration)

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Alexander Jahn @physicistalex.bsky.social · 09/04/2025

There's really no sane endgoal to these tariffs. If the US builds a huge tariff fence around itself, on which side are globally integrated companies going to base their operations?

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Alexander Jahn @physicistalex.bsky.social · 07/04/2025

Cherry blossom at Freie Universität Berlin...

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Alexander Jahn @physicistalex.bsky.social · 03/04/2025

Definitely missed "Bovine Nietzscheanism" on my 2025 bingo card.

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Alexander Jahn @physicistalex.bsky.social · 02/04/2025

If only those American kids had paid attention in class back in the 80s... www.youtube.com/watch?v=yuOH...

youtube.com

Hawley–Smoot Tariff - Ferris Bueller's Day Off.

YouTube video by International School History

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Alexander Jahn @physicistalex.bsky.social · 02/04/2025

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

arxiv.org

On Infinite Tensor Networks, Complementary Recovery and Type II Factors

We initiate a study of local operator algebras at the boundary of infinite tensor networks, using the mathematical theory of inductive limits. In particular, we consider tensor networks in which each ...

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Steven Thomson @physicssteve.bsky.social · 15/03/2025

Not much time left to apply for this - the deadline is on Monday, so get those applications in quick if you're interested in joining the University of Edinburgh to work on exciting challenges in open quantum systems!

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