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*.

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

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...

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!

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.

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

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?"

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...

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

Prepared a papal dish this Sunday.

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.

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.

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...

In the countryside of Kyotango, central Japan.

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

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

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)

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)

... and near Kyoto University!

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?

Cherry blossom at Freie Universität Berlin...

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

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

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

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!

America has been compromised.

Your favorite K-Drama just got cancelled? You feel like you're missing the "wow factor" of intense emotions and human struggle? Then you should read the Peer Review File of Microsoft's "Interferometric single-shot parity measurement in InAs–Al hybrid devices"! www.nature.com/articles/s41...

Met this visitor in front of our department this morning! Like many great thinkers he's rather quiet, but clearly has deep knowledge of low-temperature physics. I expect he'll stay for a few days.

What an irony to have the current US vice president lecture Europeans on democracy, just after his boss released the rioters from prison who tried to kill a previous vice president for certifying election results. edition.cnn.com/2025/02/14/w...

Winter view from my balcony this morning. Sometimes I miss Southern California'a eternal summer, but I couldn't live long in a place without seasons.

TQC 2025 will take place at IISc Bengaluru, India, September 15-19, 2025. Submission deadline is March 1. tqc-conference.org

Our work on overlapping qubits in quantum gravity has now been published in Nature Communications! www.nature.com/articles/s41...

I'm hiring a postdoc to work with me at the University of Illinois Urbana-Champaign! For details and how to apply, visit felixleditzky.info/postdoc2024.... Applications received by January 10 (AoE) will receive full consideration. Please share!

Merry Christmas!

If you're an early-career faculty member (received their PhD within seven years of submission) in quantum computing, consider applying to Google's Research Scholar Program. The application process is lightweight and the grant comes in the form of an unrestricted gift. research.google/programs-and...

I don't care what Elon calls it now, for me this celebration will always be Twittermas.

I mean…