QuOI Theory
@quoi-theory.at
We're Quantum Optics & Information: the theory division of TU Wien's Atominstitut. Also with groups for quantum thermo, foundations, computing, and more! We ❤️ open, diverse science + good coffee! Find us at https://quoi-theory.at/ Posts by @tomrivlin.com
New from Philipp in PRA, showing how to perform high-harmonic generation in the classically forbidden region, and produce super-Poissonian photon statistics in so doing. This allows them to test quantum properties of the driving field journals.aps.org/pra/abstract...
In our group we love the Landauer bound on dissipation. So in this new preprint from Jan, Jake, Pharnam, and Marcus, they explore how the cost of erasure can increase when one has access only to finite resources, in both the classical and quantum cases arxiv.org/abs/2607.27341
New preprint from Dani, Marcus, and Alberto: Working out how much work quantum systems do is hard work! In this new work, the team work up the courage to work through a new definition of the quantum work operator arxiv.org/abs/2607.20602
This first one is now out in PRL! journals.aps.org/prl/abstract...
QuOI Theory@quoi-theory.at · 9mo agoTwo 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
New preprint! Erik, Pharnam, Moha & co. They look at quantum thermometry when the dynamics are non-Markovian, deriving expressions for the Fisher information and the scaling of the precision in this scenario arxiv.org/abs/2607.15978
New in Reports on Progress in Physics by Florian, Marcus, Pauli, and Jake: they develop a self-contained model of a quantum processor without external control, to figure out what thermodynamic resources a quantum computer fundamentally needs to operate iopscience.iop.org/article/10.1...
New in Sciences Advances from Nicky, Florian, Pauli, and Marcus: A new way to characterise high-dimensional, time-frequency entanglement in photons for use in quantum key distribution, all with methods that can use commercial telecom components! www.science.org/doi/10.1126/...
This is now out in PRX Quantum! journals.aps.org/prxquantum/a...
QuOI Theory@quoi-theory.at · 12mo agoNew preprint from Manu, Max, and Marcus. With their colleagues they designed a minimal model of a quantum measuring device to study an important question: does it take more entropy production to extract better quality information from a measurement? arxiv.org/abs/2508.16375
New preprint! Dorian and colleagues make a simple derivation of Wigner's Inequality and a basic quantum optical lab setup to test it, with data to go with it. If you're designing an undergrad program to teach QM and give students an intuition for it, this one's for you! arxiv.org/abs/2606.30255
New preprint! Philipp studies the implications of two-electron effects on the strong-field approximation and look at high-harmonic generation in this context arxiv.org/abs/2606.24765
New preprint! Shuheng looks at the implications for multipartite entanglement in many-body systems of exceptional points arxiv.org/abs/2606.24205
New preprint! Florian and Marcus propose a new, easily-implementable method for certifying entanglement in discrete time bin temporal superposition states arxiv.org/abs/2606.23817
New preprint! Philipp and colleagues show that bright-squeezed-vacuum-driven high-harmonic generation can lead to non-Gaussianity in the resulting states, or to Gaussian entanglement, or to non-classical Gaussian states arxiv.org/abs/2606.22714
New preprint! It's known that measurement error can make certifying quantum effects harder. But here, Simon and colleagues show that it's sometimes possible for an adversary to trick you into seeing entanglement using arbitrarily small errors! arxiv.org/abs/2606.20396
What a brilliant day, three consecutive defenses: It was an honor to serve on the PhD committee of Philipp Sohr (middle), and then very proud to see my student Nicky Kai Hong Li (second from right) defend valiantly, before leaning back as Marcus' (left) student Iraj (second from left) took the stage
QuOI Theory@quoi-theory.at · 2mo agoWhat's better than celebrating a PhD defence? How about THREE? Congrats to Drs (L-R) Umesh, Sohr, and Li for finishing their doctorates (and organising a three-in-a-row defence day!)
What's better than celebrating a PhD defence? How about THREE? Congrats to Drs (L-R) Umesh, Sohr, and Li for finishing their doctorates (and organising a three-in-a-row defence day!)
My mom: What have you been doing all these years? Me:
QuOI Theory@quoi-theory.at · 2mo agoCongratulations, Dr. Xuereb! 🔥🧊🖥️👹
@quoi-theory.at mods posted the defense pic where I look most dead - whilst I was tired, I was also very happy ❤️
QuOI Theory@quoi-theory.at · 2mo agoCongratulations, Dr. Xuereb! 🔥🧊🖥️👹
New from Philipp: a Rep. Prog. Phys. about attosecond quantum optical interferometry! iopscience.iop.org/article/10.1... See also this write-up in Physics World: physicsworld.com/a/attosecond...
New preprint from Klára and Nico on genuinely multipartite entanglement: they show that all members of a certain kind of Gaussian state are both fully inseparable biseparable, and also GME. This raises the question: are ALL fully inseparable Gaussian states GME? arxiv.org/abs/2605.28404
New preprint! Here, Dorian, Marcus, and Eliza describe how to create a form of entanglement that has both discrete and continuous features in a quantum optical setting arxiv.org/abs/2605.26962
Two new preprints today! First, a first arXiv posting for Bita. The team used a quantum optics setup to detect contextuality with sequential, single-photon measurements, both theoretically and experimentally arxiv.org/abs/2605.18112
New preprint! Dimpi, Shuheng, Giuseppe, and Konrad study the structure of covariance matrices for finite-dimensional position and momentum observables, expanding uncertainty relations to account for more complicated correlation structures arxiv.org/abs/2605.11876
This is now out in Quantum! quantum-journal.org/papers/q-202...
QuOI Theory@quoi-theory.at · last yr.Here's a preprint roundup from the last 10 days while admin was away 😎 First, the first preprint of PhD student Julia (along with Giuseppe) is out: They looked at entanglement monotones for many-body systems, including near phase transitions arxiv.org/abs/2504.07814
This is now published in PRL! journals.aps.org/prl/abstract...
QuOI Theory@quoi-theory.at · 10mo agoNew 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
