iiinova — where your digital self keeps evolving

Big thanks to my amazing collaborators: @curlyqubit.bsky.social, for the exponentially many Zoom discussions, @rafammacedo.bsky.social, Jonatan Bohr Brask and Rafael Chaves (for the superexponential number of WhatsApp messages about these results!)... continue/continue

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This project is special to me. It grew out of some technical results while I was working on a totally different question in quantum thermo/open systems, then ended up being more interesting than the original question ahaha

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... Finally, turning to dynamics, we determine the temperature below which magic emerges in thermal equilibrium for systems with parity-symmetric Hamiltonians (continue/continue). We illustrate these results using 3 paradigmatic many-body models motivated by experimentally demonstrated interactions:

... We also give a universal lower bound that lets us certify magic in general states. As an illustration, we consider the ground state of the transverse-field Ising model and look at its RoM as a function of the transverse-field strength going beyond the reach of exact evaluation (continue)/n

We show that this symmetry lets us calculate their magic analytically, while constraining it to at most a single qubit’s worth of magic, no matter how large the system becomes...(continue)/n

Alex @itsmealeale.bsky.social · 27/09/2026

Can a physically motivated symmetry make many-body magic analytically solvable? If so, at what cost? We answer this question (arxiv.org/abs/2609.38319), by looking at pairwise parity symmetry. This gives rise to a family of quantum states known as X-states. (continue..)/n

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(Silly question): if I’m about to submit a paper (not for QIP) and want to get some visibility from the community, would it be better to wait a bit until after the QIP rush?

Jake Xuereb @curlyqubit.bsky.social · 25/08/2026

Reposted by Alex

Today on the arXiv with @itsmealeale.bsky.social we provide insights into the question of whether the presence of quantum entanglement at equilibrium can influence how an interacting system responds to changes in temperature. scirate.com/arxiv/2608.2...

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Reposted by Alex

Valerio Scarani @valerioscarani.bsky.social · 05/08/2026

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?

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Alex @itsmealeale.bsky.social · 25/06/2026

Oh, I miss krakow!! Are u also visiting Karol?

Dulwich Quantum Computing @dulwichquantum.bsky.social · 03/06/2026

Reposted by Alex

My mom: What have you been doing all these years? Me:

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Alex @itsmealeale.bsky.social · 19/04/2026

So sick! How did you make this map?

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Reposted by Alex

Saulo Moreira @saulovmo.bsky.social · 18/04/2026

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

youtube.com

Quantum Quest Portuguese Version. An animated short explaining quantum science in an accessible way.

YouTube video by AMBER Centre

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Reposted by Alex

Rafael Macêdo @rafammacedo.bsky.social · 13/04/2026

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

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Alex @itsmealeale.bsky.social · 12/04/2026

Strict or correlated catalysis?

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Reposted by Alex

Centre for Quantum Technologies @quantumlah.bsky.social · 30/03/2026

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.

cqt.sg

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

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Alex @itsmealeale.bsky.social · 01/04/2026

My debut as a professional Maxwell’s demon designer

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APS DSNP @aps-dsnp.bsky.social · 14/03/2026

🎉 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

journals.aps.org

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.

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Reposted by Alex

Jake Xuereb @curlyqubit.bsky.social · 04/03/2026

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!

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Rafael Macêdo @rafammacedo.bsky.social · 25/02/2026

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

arxiv.org

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...

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Alex @itsmealeale.bsky.social · 13/02/2026

Amazing! Congrats Lauritz.

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Disclaimer: this is a very bad thread from someone who never writes threads and is currently on the bus (checking my stop every 10 seconds)… But the paper itself is nicely written 😅

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This was a really nice collaboration with the brilliant master’s student Xiaotian Yang, which started with Ulrik and me during a visit to Japan, and really took shape when Santiago Zamoras and Rafael Chaves spent time with Jonatan and me. Also: my first paper as last author. Hope you enjoy!

This allowed us to probe the nonlocality of two paradigmatic states: W and GHZ. And we found that GKP states provide strong and robust multipartite nonlocality: not high critical squeezing, tolerance to loss, and robustness to noise - all treated almost analytically. (5/n)

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…no Bell violation in the bipartite case using only homodyne (and stabilizer resources, of course). For the multipartite case, however, we found a nice analytical way of computing the conditional probabilities! (4/n)

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(3/n) This is exactly where GKP changes the picture. It turns homodyne + classical binning into effective qubit measurements, while keeping all the experimental advantages. To start with, we looked at finite-energy (i.e. “realistic”?) GKP states and proved a no-go result:

Homodyne detection is a natural candidate when talking about Bell nonlocality: it closes the detection loophole, is easy to implement, and comes with high efficiency… But it is also strongly constrained in continuous-variable (CV) systems. 2/n

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Florian Meier @flowrian.ch · 19/01/2026

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.

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Reposted by Alex

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

Chain of quantum two level systems. Excitations traveling from left to right, each time marking a tick when they leave on the right.

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Alex @itsmealeale.bsky.social · 14/10/2025

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...

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Reposted by Alex

Ryuji Takagi @ryujitakagi.bsky.social · 09/10/2025

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

arxiv.org

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...

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Alex @itsmealeale.bsky.social · 01/10/2025

Thank you very much, Jake!!!! You’re awesome.

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Reposted by Alex

Jens Eisert @jenseisert.bsky.social · 28/08/2025

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.

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Alex @itsmealeale.bsky.social · 11/08/2025

Thank you for the very kind words, Jake!!!

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Alex @itsmealeale.bsky.social · 11/08/2025

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?

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Alex @itsmealeale.bsky.social · 26/07/2025

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)

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Reposted by Alex

Nelly Ng @nellynghy.bsky.social · 23/07/2025

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.

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Alex @itsmealeale.bsky.social · 23/07/2025

Very beautiful results, Nelly! Already started my late morning reading it 😍

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Alex @itsmealeale.bsky.social · 10/07/2025

My happiest memories are tied to this university, this office, and that chapter of my life. Even cooler to see my old office mate getting his PhD tomorrow! Finally get to use this picture (taken in 2021, just sitting in my gallery waiting for this moment):

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Alex @itsmealeale.bsky.social · 10/07/2025

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!

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Alex @itsmealeale.bsky.social · 07/07/2025

Entangled exit strategies

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Alex @itsmealeale.bsky.social · 17/06/2025

Hmm… The only quantum aspect is assuming a closed system evolving under energy-preserving unitaries. This leads to a partial order on state transformations. Replacing unitaries with Gibbs-preserving stochastic matrices gives the same result-nothing uniquely quantum. But maybe I’m missing the point.

Alex @itsmealeale.bsky.social · 14/06/2025

Sorry for not being clearer - I’m in a shelter at the top of a mountain in Japan right now. Hard to type and be coherent haha

Alex @itsmealeale.bsky.social · 14/06/2025

I was referring to the first one showing the partial order for classical states (diagonal in the energy eigenbasis): „Nat. Commun. 4, 2059 (2013)”. For the cones: „Phys. Rev. E 106, 064109 (2022)”. But yes, Kamil & Matteo also showed this for Markovian thermal processes…

Jake Xuereb @curlyqubit.bsky.social · 13/06/2025

Reposted by Alex

(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...

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Alex @itsmealeale.bsky.social · 13/06/2025

In the video you can see the set of achievable states under thermodynamic transformations for a given an out of equilibrium state (4D state) in contact with a bath: green is the achievable states, blue the set that I achieve the initial state and red the set of incomparable states….