Alex
@itsmealeale.bsky.social
I think about Maxwell’s demon more than I should.
Currently, a postdoc at DTU thinking about different quantum stuff.
Currently, a postdoc at DTU thinking about different quantum stuff.
Reposted by Alex
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...
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
February 12, 2026 at 2:38 PM
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...
doi.org/10.1103/d7nm...
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.
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.
January 23, 2026 at 7:43 AM
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.
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.
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
January 19, 2026 at 11:36 AM
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...
October 14, 2025 at 7:18 PM
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...
Reposted by Alex
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
October 9, 2025 at 1:20 AM
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
Reposted by Alex
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.
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.
August 28, 2025 at 8:59 AM
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.
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?
The big question after the tutorial is whether I’m finally done drawing demons?
August 11, 2025 at 4:29 PM
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?
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)
(arxiv.org/abs/2503.03585)
July 26, 2025 at 8:27 AM
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)
(arxiv.org/abs/2503.03585)
Reposted by Alex
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.
July 23, 2025 at 3:07 AM
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!
July 10, 2025 at 9:22 AM
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!
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...
scirate.com/arxiv/2506.1...
June 13, 2025 at 6:27 AM
(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...
scirate.com/arxiv/2506.1...
Reposted by Alex
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
May 27, 2025 at 9:04 AM
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
Reposted by Alex
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...
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
May 21, 2025 at 8:54 AM
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...
Xin Yi from CQT wrote a great highlight article for this paper: www.cqt.sg/highlight/20...
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.
April 21, 2025 at 7:29 AM
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.
Reposted by Alex
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...
Comments, feedback and suggestions welcome!
felixleditzky.info/selected_ref...
March 27, 2025 at 5:27 PM
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...
Comments, feedback and suggestions welcome!
felixleditzky.info/selected_ref...
Reposted by Alex
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
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
March 14, 2025 at 9:10 AM
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
arxiv.org/abs/2503.09693
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).
Very happy to share "a friendly guide to exorcising Maxwell's demon" (arxiv.org/pdf/2503.07740).
March 12, 2025 at 7:34 PM
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).
Very happy to share "a friendly guide to exorcising Maxwell's demon" (arxiv.org/pdf/2503.07740).
Reposted by Alex
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
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
March 7, 2025 at 7:27 AM
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
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
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!
March 5, 2025 at 12:06 PM
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!
Reposted by Alex
A novel method detects quantum properties by observing heat flow, linking thermodynamics with quantum information theory, offering an alternative to traditional measurement techniques. doi.org/g86pcf
Inspired by Maxwell's demon, heat flow acts as a witness to quantum properties
In a new study published in Physical Review Letters, scientists have discovered a novel approach to detecting the quantum properties of a system by simply using heat as a witness, requiring no direct measurement of the quantum system itself.
phys.org
February 28, 2025 at 1:32 PM
A novel method detects quantum properties by observing heat flow, linking thermodynamics with quantum information theory, offering an alternative to traditional measurement techniques. doi.org/g86pcf
Reposted by Alex
(1/n) Been taking sm time off that's so far included, snow hiking, dog running and espresso machine cloning.
Now headed to Copenhagen by train for long runs w @itsmealeale.bsky.social
En route I'm reading thought provoking essays and articles that force you to take a step back
Commentary below 👇
Now headed to Copenhagen by train for long runs w @itsmealeale.bsky.social
En route I'm reading thought provoking essays and articles that force you to take a step back
Commentary below 👇
February 21, 2025 at 11:35 AM
(1/n) Been taking sm time off that's so far included, snow hiking, dog running and espresso machine cloning.
Now headed to Copenhagen by train for long runs w @itsmealeale.bsky.social
En route I'm reading thought provoking essays and articles that force you to take a step back
Commentary below 👇
Now headed to Copenhagen by train for long runs w @itsmealeale.bsky.social
En route I'm reading thought provoking essays and articles that force you to take a step back
Commentary below 👇
Hi all,
I was uncertain about joining a new social media, but after seeing so many great “tweets” from quantum people, I decided to give it a shot!
Below is a gif I made a few months ago while bored—just something to catch your attention.
I was uncertain about joining a new social media, but after seeing so many great “tweets” from quantum people, I decided to give it a shot!
Below is a gif I made a few months ago while bored—just something to catch your attention.
February 21, 2025 at 10:06 AM
Hi all,
I was uncertain about joining a new social media, but after seeing so many great “tweets” from quantum people, I decided to give it a shot!
Below is a gif I made a few months ago while bored—just something to catch your attention.
I was uncertain about joining a new social media, but after seeing so many great “tweets” from quantum people, I decided to give it a shot!
Below is a gif I made a few months ago while bored—just something to catch your attention.