Alex
@itsmealeale.bsky.social
I think about Maxwell’s demon more than I should. Currently, a postdoc at DTU thinking about different quantum stuff.
Every civilization have martial heroes, people with highly sophisticated skills developed for war. Then firearms came, which any idiot can use, and became the tool for the task. Martial arts remain as prowess for sports or cultural shows. Are mathematicians the next samurais?
My mom: What have you been doing all these years? Me:
QuOI Theory@quoi-theory.at · 2mo agoCongratulations, Dr. Xuereb! 🔥🧊🖥️👹
Quantum Quest is now available in five languages! 🐈⬛ ambercentre.ie/additional-l... For those of you who know me, Bob’s voice might sound a little familiar in Portuguese… www.youtube.com/watch?v=wfIH... #SciComm #STEMEducation #Quantum
Quantum Quest Portuguese Version. An animated short explaining quantum science in an accessible way.
YouTube video by AMBER Centre
youtube.com
new paper! energy is one of the simplest and main quantum observables: it is experimentally friendly and theoretically simple. can we witness magic by looking at energy/heat measurements? well, "every little heat is magic"! arxiv.org/abs/2604.08663 1/n
CQT Fellow Nelly Ng, group members Jeongrak Son and Ray Ganardi and their collaborators present a new analysis of the conditions for robust catalysis in the quantum regime.
Researchers lay out rules for robust catalysis - CQT - Centre for Quantum Technologies
The group of CQT Fellow Nelly Ng and collaborators find conditions that make quantum catalysts fully reusable
cqt.sg
My debut as a professional Maxwell’s demon designer
QuOI Theory@quoi-theory.at · 4mo agoA 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
🎉 30 years of Statistical & Nonlinear Physics — and we're just getting started! To mark the transition from APS G to D, @physreve.bsky.social have highlighted the most influential papers that drew the map of the field. 📖 journals.aps.org/over-30-years #StatisticalPhysics #DSNP #Physics
Over 30 years of Statistical and Nonlinear Physics in _Physical Review E_
APS Division of Statistical and Nonlinear Physics and <em>Physical Review E</em> review over 30 years of research in the division’s areas.
journals.aps.org
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 paper! how can one predict and detect magic of many-body quantum states using few body measurements ? what are the fundamental complexity-theoretic limitations ? we tackle this question in arxiv.org/abs/2602.18939 1/n
Predicting Magic from Very Few Measurements
The nonstabilizerness of quantum states is a necessary resource for universal quantum computation, yet its characterization is notoriously demanding. Quantifying nonstabilizerness typically requires a...
arxiv.org
Happy to see our paper Uniqueness of Purifications Is Equivalent to Haag Duality with @arrr.de and @stotti-alex.bsky.social published in PRL! 🥳 doi.org/10.1103/d7nm...
Uniqueness of Purifications Is Equivalent to Haag Duality
The uniqueness of purifications of quantum states on a system $A$ up to local unitary transformations on a purifying system $B$ is central to quantum information theory. We show that, if the two syste...
doi.org
Can Gottesman–Kitaev–Preskill (GKP) encoding turn homodyne detection into a practical tool for revealing Bell nonlocality? The answer is yes, and in fact GKP states also lead to strong and robust multipartite nonlocality with homodyne detection! Today on arXiv: arxiv.org/abs/2601.16189 1/n.
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
Save the date: sun, sea & science, where wave–particle duality means talks in the morning, surf in the afternoon. Quantum at the Dunes (IIP, Natal 🇧🇷) — School 23–27 Feb 2026 → Workshop 2–6 Mar 2026. www.even3.com.br/quantum-at-t...
Posted a joint work with Naoto Shiraishi on quantum thermodynamics. We managed to characterize the state transformability (for general coherent states!) with a correlated catalyst by the single free energy ordering. arxiv.org/abs/2510.05642
Recovery of the second law in fully quantum thermodynamics
Quantum thermodynamics investigates how robust the second law of thermodynamics serves as the unique fundamental law in the small quantum world. To tackle this problem, the quantum coherence constitut...
arxiv.org
Quantum metrology in the finite-sample regime journals.aps.org/prxquantum/a... We propose an operational framework of #quantummetrology in the practically meaningful regime of a few measurement samples, introducing probably approximately correct (#PAC) metrology.
Our tutorial "A friendly guide to exorcising Maxwell's demon" (journals.aps.org/prxquantum/p...) is out! The big question after the tutorial is whether I’m finally done drawing demons?
When I grow up I wanna be like Kristian: talk about quantum gravity while wearing a black-flag t-shirt. (arxiv.org/abs/2503.03585)
Whether or not you're a fan of thermal operations, there's something fundamentally special about them: by pinning down what it means to equilibrate, thermal operations uniquely emerge! With this, we also uncover nice hierarchy of unital channels, in contrast with the classical Birkhoff theorem.
Back in Krakow after 1.5 years. First stop: my old office (just had to see it). Somehow got in and boom 💥: everything was exactly the same: Kamil’s notes on my desk, unfinished (now finished) calcs from Marti’s project, old running gear, and the cactus I bought when I started my PhD!
(1/n) Today on the arXiv, we examine the folklore that cooling a quantum system with access to another requires one to order their joint state eigenvalues in decreasing order and find that this sorting is actually dictated by a simple set of inequalities. scirate.com/arxiv/2506.1...
New paper today! Very excited to announce we obtain, from first principles, a quantum master equation that both applies in the many-body regime and provably converges to the exact Gibbs state: arxiv.org/abs/2505.20064
Thermalization in open many-body systems and KMS detailed balance
Starting from a microscopic description of weak system-bath interactions, we derive from first principles a quantum master equation that does not rely on the well-known rotating wave approximation. Th...
arxiv.org
Our paper (w/ Marek, @ryujitakagi.bsky.social, @nellynghy.bsky.social ) on Quantum Dynamic Programming has recently been published in PRL: journals.aps.org/prl/abstract... Xin Yi from CQT wrote a great highlight article for this paper: www.cqt.sg/highlight/20...
Quantum Dynamic Programming
We introduce a quantum extension of dynamic programming, a fundamental computational method that efficiently solves recursive problems using memory. Our innovation lies in showing how to coherently ge...
journals.aps.org
Started reading “the physics of filter coffee” by @jgagneastrocoffee.bsky.social —highly recommend! While browsing around, I found out he also developed an app to measure grind size distribution. Super useful—I’ve always found it hard to get clear grind size advice or compare grinders properly.
I've been revamping and updating my collection of selected references to topics in quantum information on my homepage. Comments, feedback and suggestions welcome! felixleditzky.info/selected_ref...
Wrote up a little tutorial + review on higher-order quantum operations. If you love quantum channels, you can think of these as linear maps that act on channels themselves in manner fully consistent with quantum theory! I hope it helps future students / researchers! 🤗 arxiv.org/abs/2503.09693
Higher-Order Quantum Operations
An operational description of quantum phenomena concerns developing models that describe experimentally observed behaviour. $\textit{Higher-order quantum operations}\unicode{x2014}$quantum operations ...
arxiv.org
Maxwell’s demon was on holiday, just catching up on recent updates… until it thought, ‘Hmmm, I should write a tutorial!' Very happy to share "a friendly guide to exorcising Maxwell's demon" (arxiv.org/pdf/2503.07740).
We have a new paper 🎉: The large-scale structure of entanglement in quantum many-body systems Thanks to @lvanluijk.bsky.social and @stotti-alex.bsky.social for the great collaboration. arxiv.org/abs/2503.03833 Short thread below 👇 (1/n) #entanglement #quantum #quantuminformation
The Large-Scale Structure of Entanglement in Quantum Many-body Systems
We show that the thermodynamic limit of a many-body system can reveal entanglement properties that are hard to detect in finite-size systems -- similar to how phase transitions only sharply emerge in ...
arxiv.org
Had to say goodbye to my usual Maxwell’s demon for a talk that I’m preparing (not about quantum thermo this time)… but fear not! A unitary transformation later, and voilà—a Gaussian ghost appears to say thanks instead!
