New preprint! Carlos looks at the dynamics of an all-to-all quantum Ising model and finds that it expresses a wide range of behaviours, from integrable to chaotic arxiv.org/abs/2604.14798

New in PRA! Using analytic and numerical methods, Carlos and colleagues study how imperfections in a measuring device impact one's ability to characterise a quantum many-body state journals.aps.org/pra/abstract...

New preprint! Marcus and Nico from our team were involved in this huge roadmap on high-dimensional quantum photonics! arxiv.org/abs/2604.06528

...okay back to serious papers, starting with the field of many-body physics. In this new preprint, Julia, Nicky, Pharnam, and Giuseppe provide new optimal entanglement witnesses for various many-body thermal settings: arxiv.org/abs/2604.01157

A new, very serious preprint is out from Veronika and Alberto. No, don't look at today's date it's 100% legit we promise. It's a genuine proof that P=NP... (...if you believe in quantum many-worlds and are willing to destroy almost every observer in the multiverse 👀) arxiv.org/abs/2603.28869

This is now fully published in Reviews of Modern Physics. Congrats to all involved! journals.aps.org/rmp/abstract...

New preprint! Manu, Max, and Pharnam look at how long chaotic many-body systems take to equilibrate, with both analytics and a numerical model. They find both results that confirm random matrix theory and results that suggest it is lacking in places! arxiv.org/abs/2603.28587

New preprint! Philipp and colleagues show how quantum fluctuations can lead to symmetry-breaking and violation of classical selection rules in high harmonic generation, leading to squeezing-like behaviour arxiv.org/abs/2603.24377

New in Quantum! Shuheng and colleagues lay out new, experimentally-accessible ways to detect entanglement directly from measurements of the Wigner function! quantum-journal.org/papers/q-202...

We talk a lot here about weird quantum things, from conceptual foundations questions to technological challenges. It's easy to be confused by it all, so here's Phila from our group giving a TEDx Talk at TU Wien last year on demystifying quantum physics! www.youtube.com/watch?v=pJkO...

This is now fully published in Phys Rev Letters! journals.aps.org/prl/abstract...

New preprint! arxiv.org/abs/2603.18212 Nicky, Florian, Pauli, and Marcus join a big team continuing work on high-dimensional entanglement and time bins for quantum communication. The key rates and noise resilience keep getting better and better!

This is now fully published in Phys. Rev. Lett. and has even been featured in APS's Physics Magazine! journals.aps.org/prl/abstract... physics.aps.org/articles/v19...

Yet more fun with time in quantum theory! In this new preprint, Veronika and Max study how systems that evolve relative to a clock behave when there are multiple clocks involved, and how to understand quantum operations and causality in this context arxiv.org/abs/2603.08845

New paper in PRA! Continuing our long-running study of quantum measurements as dynamical processes and the emergence of classicality, here we study observables that best encode measurement outcomes under equilibration-on-average dynamics and quantum Darwinism journals.aps.org/pra/abstract...

Get your shades and leather jackets on and say "I'm in", because today we're hackers 🕶️ The new preprint from Giorgio (his first!), Dorian & Pauli, shows a new, old-fashioned way to intercept info from a quantum computer: by monitoring passive radio emissions from it arxiv.org/abs/2603.06562

New preprint! For a different look at time in quantum theory from yesterday's post, check out this work by Jakob and Pauli, studying when feedback can provide advantage in the performance of a quantum clockwork (and when it can't for a classical one!) arxiv.org/abs/2603.04556

New in New Journal of Physics: Max joins a team studying relational dynamics -- dynamics relative to an explicit clock system. Here they show how this works when the clocks are periodic, and relate the Page-Wootters formalism to other equivalent approaches iopscience.iop.org/article/10.1...

The Qalypso School on Quantum Science in Malta returns for its 3rd edition Aug 31 - Sep 4 this year! 🏖️ We have a great line up of lecturers covering Quantum Optimisation, Quantum Thermodynamics and Quantum Gibbs Sampling. Pre-registrations opens today at forms.gle/3NkMJ3Br9V8b... Do Share!

New preprint, and a first for Jan! The team introduce a new approximation tool for open quantum systems, with simplicity and computational efficiency comparable to that of adiabatic elimination, but with improved performance arxiv.org/abs/2602.21896

Now fully published in Nature Photonics! Marcus and Nico join a team who have successfully experimentally implemented a photonic qudit-qudit entangling gate! www.nature.com/articles/s41...

10 years after its founding, driven by the energy, enthusiasm, & dedication of the community @quantum-journal.bsky.social quietly published paper #2000 some days ago. At least I think this is a big deal, big shout out to the founders & all authors, reviewers, editors, board members & contributors!

New preprint! Eliza and colleagues introduce a generalised notion of correlations and products for quantum states, which includes entanglement and tensor products, and provide a resource-theoretic description for it. arxiv.org/abs/2602.15520

New preprint! Erik and Moha join with former group member Jessica and propose a quantum metrology algorithm that optimally estimates parameters. They study parallel, sequential, indefinite causal, and even higher-order operations arxiv.org/abs/2602.09655

New preprint: Santiago worked on this with Eliza while visiting here as part of his master's studies. They propose a new quantum secret direct communication protocol based on choices of measurement bases arxiv.org/abs/2602.05972

Last week we reintroduced ourselves as QuOI: a research unit made of many quantum theory groups. Now let's introduce each group. First, there's Marcus Huber's QuIT group, for quantum info, thermodynamics and all their fun interactions (the photo is of the whole unit, not just one group!)

The quantum thermo roadmap is now fully published in Quantum Science & Technology. Apparently I called it an "amuse-bouche" when the preprint came out and I stand by that description! iopscience.iop.org/article/10.1...

New preprint! Master's student Jhoan joins Esteban, Tom, and Eliza in writing a lovely set of lecture notes that serve as an introduction to quantum optics. This also includes a large list of Python code snippets that simulate well-known problems in quantum optics arxiv.org/abs/2601.20619

Hey quantum Bluesky! Allow us to reintroduce ourselves! You may know us as QuIT: Marcus Huber's Quantum Information and Thermodynamics group at TU Wien. But we're so much more than that, and it's time our name reflected it. So say hello to... 𝗤𝘂𝗢𝗜? quoi-theory.at

New preprint! Master's student Jian joins Marcus, Nico, and Pharnam in finding a new way to model the impact of noise on quantum thermodynamic protocols, with interesting implications for certain cooling algorithms arxiv.org/abs/2601.16317

From one tick to the next, small timing uncertainties in clocks usually add up because of the independence of errors. Using fermions tunneling through a quantum wire as clock ticks, we found a way to build a clock where errors cancel out rather than accumulate. arxiv.org/abs/2601.10785

New preprint! Florian, Yuri, Marcus, and collaborators' clock research ticks forward yet again. This time, they show how a clock can autonomously self-correct ticks using quantum correlations, leading to exponential advantage in precision arxiv.org/abs/2601.10785

Interesting new preprint from our group's visiting professor Carlos. He and his colleagues statistically study the linguistic content of papers in different fields of physics, finding that they can predict the journal a paper is in from the words used www.preprints.org/manuscript/2...

Five members of our team are on this new preprint, including Dorian's first first authorship! Congrats to Dorian, Alexandra, Florian, Pauli, and Marcus for finding a new way to produce high-dimensional time-bin entanglement, and verifying it with a new QKD protocol! arxiv.org/abs/2601.07678

This is now out in Phys. Rev. A! journals.aps.org/pra/abstract...

Our Research Unit had a pretty amazing year in 2025. In total: -3️⃣7️⃣ preprints were released -5️⃣ of those were also fully published -1️⃣9️⃣ more preprints from previous years were fully published Congrats, everyone! ❤️ Here's to a fun year of research in 2026 www.quitphysics.info/publications

Quite happy seeing this work out now in @prxquantum.bsky.social It was great fun working with my collaborators on this one. Especially pleased to have brought some graph theoretic combinatorics to Quantum Thermodynamics 🔥🧊 journals.aps.org/prxquantum/a...

Today we had The Journies, the annual "Papers of the Year" award at our quantum theory journal club. After an informal, just-for-fun vote, the winners were: 1. Most well-written paper: A Friendly Guide to Exorcising Maxwell’s Demon; A. de Oliveira Junior et. al. journals.aps.org/prxquantum/a...

New in Phys Rev Research! Marcus, Max, and Manu (while he was still working in Vienna) propose a dynamic model of quantum measurements as an equilibration process, motivated by the laws of thermodynamics: The Measurement-Equilibration Hypothesis journals.aps.org/prresearch/a...

Notably, this makes it a double-double of 🇪🇺 #ERC grants for the Atominstitut this year — 🏅Andreas Schindewolf and 🏅Uroš Delić received an #ERCStG, while 🏅Philipp Haslinger and 🏅I received an #ERCCoG — and a double-triple for the #Physics Department at @tuwien.at

Very happy to see our latest work out in PRL doi.org/10.1103/5rtj... and highlighted by both @apsphysics.bsky.social Physics and @physicsworld.bsky.social Small thread below 🧵⬇️

This paper is now out in Phys. Rev. Applied! journals.aps.org/prapplied/ab...

New preprint! Eliza and colleagues demonstrate how a quasiprobability representation of a measurement is altered when said measurement is over- or undercomplete, including in scenarios with noise. This has implications for which states can be called 'classical' arxiv.org/abs/2511.04274

Two new arXiv postings by Shuheng today! Both on the subject of using Wigner functions to detect genuine multipartite entanglement (GME). The first preprint shows that if you have "enough" negativity in your Wigner function, that certifies that you have GME arxiv.org/abs/2510.26761

In our new paper arxiv.org/abs/2510.15693, EntaQCT www.quitphysics.info/entaqct team member Ida Mishra and myself on the side of @tuwien.at had the pleasure of collaborating with the team of Ben Lanyon at the @uniinnsbruck.bsky.social 4/8

Quantum networks might one day enable more secure options for communication and distributed computation and are therefore currently a hot research topic, one which presents many challenges: One is the on-demand distribution of quantum systems that feature genuine multipartite entanglement (GME). 1/8

New preprint! Ida and Nico join a team of experimentalists working on new ways to produce genuinely multipartite entanglement in photons using a trapped-ion quantum processor arxiv.org/abs/2510.15693

Congrats to Phila for being the DPG "Physikerin der Woche" this week! www.dpg-physik.de/vereinigunge...

New preprint from Nico. A pretty cool theoretical result demonstrated experimentally: genuine multipartite entanglement activation from two copies of a biseparable three-qubit state arxiv.org/abs/2510.12457

Congrats to the three new physics Nobel laureates, who helped lay the groundwork for superconducting quantum computing. As always, nobelprize.org has a great technical summary of the results that won the prize and the wider research context www.nobelprize.org/prizes/physi...