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Alexander Stottmeister

@stotti-alex.bsky.social
222 followers 186 following 34 posts

I am a researcher in mathematics and physics working on complex quantum systems and quantum field theory. Recently, I am also interested in earth observation.

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Reposted by Alexander Stottmeister
Greg Egan @gregegansf.bsky.social · 10/09/2026
Open Letter about the Mathathon This open letter calling for the cancellation of the Caltech “Mathathon”, has received 471 signatures so far. [Only members of the Caltech community or mathematicians at PhD student level or beyond are eligible to sign.]
docs.google.com
Open Letter about the Mathathon
The full text of the open letter is below. By signing this open letter, you consent to your name, title, and institutional affiliation being publicly displayed beneath this open letter. You can access...
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Mark M. Wilde @markwilde.bsky.social · 04/08/2026
why would I ever again share a well formulated open research question in an open problems session of a conference?
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Clément Canonne @ccanonne.github.io · 01/08/2026
"We're all worried," as what it means to do research (in my field, Theoretical CS) seems to be shifting, and shifting fast. What to do? Senior researchers must lead by example, knowing that not everything will pan out. What I'm suggesting below may not work everywhere, but here's my own advice: 1/
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Henry Yuen @henryyuen.bsky.social · 01/08/2026
Some initial thoughts, and a complicated mix of feelings. Wow. I mean, Erdos problems are cool (I genuinely mean that), I didn't know about the Jacobian conjecture before it got disproved. But this newest batch from OpenAI hits home in a way the previous announcements did not.
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Mark M. Wilde @markwilde.bsky.social · 01/08/2026
the new reality of QIP: github.com/tobiasosborn...
github.com
GitHub - tobiasosborne/QIP-submission: A 100% LLM-generated QIP submission, produced overnight from one prompt. A case study in what frontier agentic models can do — and a warning. Results NOT verifie...
A 100% LLM-generated QIP submission, produced overnight from one prompt. A case study in what frontier agentic models can do — and a warning. Results NOT verified. - tobiasosborne/QIP-submission
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International Association for Quantum Information @iaqi.bsky.social · 30/07/2026
Let's have a community discussion about the impact of LLMs on quantum information research, and how to react to it as a research community! 👩‍🔬⚛️🤖 🏛️ Head over to the IAQI forum 👇 discuss.iaqi.org/t/quantum-in... 🦋 Please share widely!
discuss.iaqi.org
Quantum Information Processing research in the age of AI
Dear colleagues, Over the past weeks there have been more and more results in which AI models played a crucial role, not only in mathematics and theoretical computer science, but right at the heart o...
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Alexander Kasprzyk @amkasprzyk.bsky.social · 29/07/2026
The point isn’t to write an essay (or solve the problem sheet, etc). It’s to learn. It’s a foil against which the student can struggle and, in so doing, think. I’ve not seen this video by Burnham, but the wider sentiment — “essays are pointless because AI can write them” — is depressingly common.
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Dmitry Grinko @dmitry-grinko.bsky.social · 28/07/2026
The last point is actually very troubling: there is a huge inequality in the access to frontier models right now. Some people are simply not aware of this AI revolution, some cannot afford paying 200$ per month, especially in less developed countries (and even in developed!). 5/n
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Alexander Stottmeister @stotti-alex.bsky.social · 28/07/2026
I tend to agree with Tobias. It will be interesting to see near-term changes in the valuation of certain aspects of research. An important problem I see is who can afford access to frontier models and how the scientific community should address this. tjoresearchnotes.wordpress.com/2026/07/28/p...
tjoresearchnotes.wordpress.com
Proof inflation
I have been thinking a lot about how social dynamics are going to shift in the new era of cognitive abundance. I don’t pretend to have any kind of crystal ball, but there are numerous histori…
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Greg Egan @gregegansf.bsky.social · 27/07/2026
While the Fields Medal celebrates the under-40s, the mathematician Joan Birman has, at the age of 99, solved a major open problem in representations of the Braid groups, a topic she has worked on for more than 60 years.
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QIP @qipconference.bsky.social · 13/07/2026
We're pleased to announce the key dates for QIP 2027, as follows (refer to the website qipconference.org/2027/ for up-to-date information). We look forward to your participation!
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Dave Richeson @divbyzero.bsky.social · 02/06/2026
I think this document does a nice job of articulating and balancing the many concerns people have about AI, the potential benefits, the spirit of mathematical research, and the reality of the current situation. I signed it.
leidendeclaration.ai
Leiden Declaration on Artificial Intelligence and Mathematics
This declaration calls for action to address the challenges posed by the use of artificial intelligence within mathematics research.
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Katie Mack @astrokatie.com · 03/04/2026
The EXIF data for the image is all here images.nasa.gov/details/art0...
images.nasa.gov
NASA Image and Video Library
NASA Image and Video Library, serving up consolidated imagery and videos in one searchable location. Users can download content in multiple sizes and resolutions and see the metadata associated with images, including EXIF/camera data on many images.
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Frederik Hahn @frederikhahn.bsky.social · 13/03/2026
I am surprised to see this and hope the arXiv stays nonprofit.
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Lauritz van Luijk @lvanluijk.bsky.social · 12/02/2026
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
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...
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Sergey Frolov🇺🇦 @spinespresso.bsky.social · 08/01/2026
The rarest of sights - a big glossy journal publishing negative replications! Yes, we had to bundle 4 replications into one article AND we had to wait 2 (!!) years in peer review, but here we are: www.science.org/doi/10.1126/...
science.org
Data sharing helps avoid “smoking gun” claims of topological milestones
Manipulating the topology of electronic bands can realize new states of matter, with possible implications for information technology. A central question is how to tell whether a topological regime ha...
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John C. Baez @johncarlosbaez.bsky.social · 02/12/2025
The largest fundamental science agency in Europe will save €1.4 million annually by breaking free from Clavariate Analytics' huge databases of references and citations. "We have worked for free to lock ourselves collectively into a paid system", one head of the CNRS explains - but no more! 🎉
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Henrik Wilming @arrr.de · 30/10/2025
Happy to see that our paper on pure state entanglement and von Neumann algebras with @lvanluijk.bsky.social, @stotti-alex.bsky.social and Reinhard Werner is finally out in CMP 🥳 link.springer.com/article/10.1...
link.springer.com
Pure State Entanglement and von Neumann Algebras - Communications in Mathematical Physics
We develop the theory of local operations and classical communication (LOCC) for bipartite quantum systems represented by commuting von Neumann algebras. Our central result is the extension of Nielsen...
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Alexander Stottmeister @stotti-alex.bsky.social · 13/10/2025
Even if you think you are not interested, you should take a look 😅.
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Joseph Luna @virologistjoe.bsky.social · 30/09/2025
I made a sign for the lab with our informal lab motto, inspired by this convo between @itaiyanai.bsky.social and Martin Lercher: nightscience.buzzsprout.com/1744020/epis.... A good reminder that talking is among the best forms of thinking!
A plastic sign with a logogram of two people in conversation alongisde text that reads "There are no lone geniuses" Our new "There are no lone geniuses" sign mounted on the door to the lab.
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Amrei Bahr @amreibahr.bsky.social · 23/09/2025
Sie ist da: Die 1. Ausgabe meines #ArbeitInDerWiss Newsletters bei Steady, wo der Newsletter ab jetzt 1 neues Zuhause hat! 🤩 & dann auch noch 1 gemeinsamer Text mit @drkeichhorn.bsky.social! 🥰 Es geht um Kürzungen an Hochschulen & warum es nun Solidarität mit Geistes- & Sozialwissenschaften braucht.
steady.page
Ins eigene Fleisch: Warum Kürzungen an Hochschulen allen schaden
von Amrei Bahr und Kristin Eichhorn
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Henrik Wilming @arrr.de · 22/09/2025
Like embezzlement of entanglement but not von Neumann algebras? Check out arxiv.org/abs/2509.15749 where we show explicitly that generic Gaussian fermionic states provide universal embezzling families. Plus: A novel bound relating trace distance of Gaussian states to their covariance matrices.
arxiv.org
Gaussian fermionic embezzlement of entanglement
Embezzlement of entanglement allows to extract arbitrary entangled states from a suitable embezzling state using only local operations while perturbing the resource state arbitrarily little. A natural...
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Lauritz van Luijk @lvanluijk.bsky.social · 17/09/2025
New paper on entanglement in infinite quantum systems with @stotti-alex.bsky.social @arrr.de 🎉:  arxiv.org/abs/2509.12911 The paper investigates bipartitions of quantum systems with infinitely many degrees of freedom. Small thread below 👇
arxiv.org
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...
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Henrik Wilming @arrr.de · 04/09/2025
🥳I am very happy to have been awarded an ERC Starting Grant that I will use to start my own group and explore the large-scale entanglement properties of complex quantum systems. This would not have been possible without my fantastic collaborators and supervisors. A big "thank you" to all of you! 🙏
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Terence Tao @teorth.bsky.social · 18/08/2025
I wrote an op-ed on the world-class STEM research ecosystem in the United States, and how this ecosystem is now under attack on multiple fronts by the current administration: newsletter.ofthebrave.org/p/im-an-awar...
newsletter.ofthebrave.org
I’m an award-winning mathematician. Trump just cut my funding.
The “Mozart of Math” tried to stay out of politics. Then it came for his research.
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Terence Tao @teorth.bsky.social · 08/08/2025
I have some related posts on this at mathstodon.xyz/@tao/1149568... and mathstodon.xyz/deck/@tao/11...
mathstodon.xyz
Terence Tao (@tao@mathstodon.xyz)
The current administration in the US has, through various funding agencies such as the NSF and NIH, has recently suspended virtually all federal grants to my home university, UCLA (including my own p...
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Terence Tao @teorth.bsky.social · 08/08/2025
#IPAM (the institute for pure and applied mathematics) is facing a critical shortfall for operating expenses due to an unexpected suspension of NSF funding www.ipam.ucla.edu/news/nsf-fun... . Donations for emergency continuity of operations funding can be made at giving.ucla.edu/Campaign/Donat
ipam.ucla.edu
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Alexander Stottmeister @stotti-alex.bsky.social · 07/08/2025
If you find it strange that the inequality involves two arbitrary states, operator-valued weights come to your aid, giving meaning to the inverse of a state. This way, the inequality becomes a statement about the cp-odering of maps from B(H) to the subalgebras associated with systems B and BC.
operator-valued weight version of the operator version of strong subadditivity
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Henrik Wilming @arrr.de · 07/08/2025
Small paper w/ @lvanluijk.bsky.social and @stotti-alex.bsky.social: We revisit the amazing operator inequality by Lin et al. (arXiv:2211.13372), which implies strong sub-additivity of entropy and find that it's a special case of Connes' theory of spatial derivatives: arxiv.org/abs/2508.03731
An inequality between density operators: \rho_A \otimes \sigma_{BC}^{-1} \geq \rho_{AB} \otimes \sigma_C^{-1}
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🪾santiago, phd 🐈‍⬛ @santiagokique.bsky.social · 02/08/2025
Terence Tao (@teorth.bsky.social) has written a thread on Mastodon about the impact of the federal grant freeze to UCLA, particularly to his own field of Mathematics. UCLA's IPAM (Institute of Pure and Applied Mathematics) could shut down entirely mathstodon.xyz/@tao/1149568...
mathstodon.xyz
Terence Tao (@tao@mathstodon.xyz)
The current administration in the US has, through various funding agencies such as the NSF and NIH, has recently suspended virtually all federal grants to my home university, UCLA (including my own p...
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Dan Garisto @dangaristo.bsky.social · 31/07/2025
For the math folks on here: NSF has suspended Terry Tao's grant. www.nsf.gov/awardsearch/...
nsf.gov
NSF Award Search: Award # 2347850
Structure theory for measure-preserving systems, additive combinatorics, and correlations of multiplicative functions
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Henrik Wilming @arrr.de · 30/07/2025
Happy to see that our paper on multipartite embezzlement with @lvanluijk.bsky.social and @stotti-alex.bsky.social is finally out in @quantum-journal.bsky.social quantum-journal.org/papers/q-202...
quantum-journal.org
Multipartite Embezzlement of Entanglement
Lauritz van Luijk, Alexander Stottmeister, and Henrik Wilming, Quantum 9, 1818 (2025). Embezzlement of entanglement refers to the task of extracting entanglement from an entanglement resource via loca...
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Alexander Kasprzyk @amkasprzyk.bsky.social · 25/07/2025
The devastating funding cuts to mathematics research in the US will cut-short the careers of a generation of mathematicians. It really is disgraceful, and unbelievably shortsighted. #MathSky www.scientificamerican.com/article/can-...
scientificamerican.com
Math Is Quietly in Crisis over NSF Funding Cuts
A 72 percent reduction in federal funding is devastating to math research. The American Mathematical Society is offering $1 million in backstop grants—but it’s likely not enough
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Andreea Lefterovici @andreealefterovici.bsky.social · 21/07/2025
Henrik will soon talk about entanglement in the thermodynamic limit at LUH :).
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Andreea Lefterovici @andreealefterovici.bsky.social · 18/07/2025
Are you a student or early-career researcher in quantum computing or quantum information? Then the following is for you. We're organising a focused, community-driven conference at Leibniz Universität Hannover, hosted by Prof. Robert Raussendorf. 🗓️ Save the date: August 27–29, 2025
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Sergey Frolov🇺🇦 @spinespresso.bsky.social · 14/07/2025
don't despair! there is still quantum...
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Greg Egan @gregegansf.bsky.social · 03/07/2025
Science writer Amanda Gefter spent more than a decade tracking down the people who knew him, and diving into a vast store of his unpublished work and private papers. A long read, but fascinating and moving. Link: nautil.us/finding-pete...
nautil.us
Finding Peter Putnam
The forgotten janitor who discovered the logic of the mind
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Henrik Wilming @arrr.de · 23/06/2025
Thanks to @phys.org.web.brid.gy for covering our recent work with @stotti-alex.bsky.social and @lvanluijk.bsky.social on embezzlement of entanglement in critical systems: phys.org/news/2025-06... Paper: www.nature.com/articles/s41...
phys.org
Universal embezzlers naturally emerge in critical fermion systems, study finds
Embezzlement of entanglement is an exotic phenomenon in quantum information science, describing the possibility of extracting entanglement from a resource system without changing its quantum state. In...
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Ulrich Pennig @pennigulrich.bsky.social · 05/06/2025
Cardiff is hosting the 38th British Topology Meeting from 9th - 11th September 2025. The registration is now open! Come along if you are looking for some interesting talks about all things topological. Details can be found here: sites.google.com/view/btm38 #MathSky #topology #AcademicSky
sites.google.com
38th BTM
The meeting will begin on Tuesday 9th September at 13:00 and will close around noon on Thursday 11th September. All talks will be held in Abacws.
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Alexander Stottmeister @stotti-alex.bsky.social · 27/05/2025
For those wondering what embezzlement of entanglement is, I have heard from Henrik (@arrr.de) that the Cambridge Dictionary is preparing an updated version…
Definition of embezzlement of entanglement according to the upcoming edition of the Cambridge Dictionary:

The crime of secretly taking entanglement that is in your care or that belongs to an organization or business you work for.
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Alexander Stottmeister @stotti-alex.bsky.social · 27/05/2025
Today our paper on universal embezzlement of entanglement in critical fermion systems has been published in Nature Physics: www.nature.com/articless415... Another intense collaboration with the great Lauritz (@lvanluijk.bsky.social) & Henrik (@arrr.de). Below is the former Twitter thread.
nature.com
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Henrik Wilming @arrr.de · 14/05/2025
There is now an official announcement: The TIB has archived the current status of the arXiv: blog.tib.eu/2025/05/14/p...
blog.tib.eu
Protecting Science: TIB builds Dark Archive for arXiv - TIB-Blog
Research and science are international; it is not for nothing that we speak of international specialist communities. Although a service such as arXiv is operated by an institution based in the USA, na...
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Ingwar Perowanowitsch @ingwarpero.bsky.social · 10/04/2025
Dass ausgerechnet die CSU-Politikerin Doro Bär, die noch vor wenigen Jahren den menschengemachten Klimawandel leugnete, jetzt neue Forschungsministerin werden soll - ein Job, bei dem es ganz besonders darauf ankommt, der Kraft der Wissenschaft zu vertrauen, ist m.E. hochproblematisch.
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Thomas Zimmer @thomaszimmer.bsky.social · 09/04/2025
📢 PODCAST   Stupidity, Ideology, and Tariffs (plus: why protests matter a great deal)   New episode of Is This Democracy:
podcasts.apple.com
42. Stupidity, Ideology, and Tariffs (plus: why protests matter a great deal)
Podcast Episode · Is This Democracy · 04/09/2025 · 1h 8m
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Kelton Minor @keltonminor.bsky.social · 18/03/2025
There are days in life that shake you. I’m shattered 💔 to share that I just found out that the US Government terminated my 2024 NIH Director’s Early Independence Award (~$2 million), threatening my long-promised assistant professor job at Columbia University & academic career... 1/🧵
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Henrik Wilming @arrr.de · 10/03/2025
I have a positive update regarding this matter: The German National Library of Science and Technology in Hannover (TIB, www.tib.eu) confirmed that they will download and archive the entire arxiv.org as a safety measure.
tib.eu
TIB – Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
Weltweit größte Fachbibliothek für Technik und Naturwissenschaften und Universitätsbibliothek der Leibniz Universität Hannover, Forschungseinrichtung in der Leibniz-Gemeinschaft
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Carl T. Bergstrom @carlbergstrom.com · 07/03/2025
Is everyone huffing paint? Crypto guy claims to have built an LLM-based tool to detect errors in research papers; funded using its own cryptocurrency; will let coin holders choose what papers to go after; it's unvetted and a total black box—and Nature reports it as if it's a new protein structure.
nature.com
AI tools are spotting errors in research papers: inside a growing movement
Study that hyped the toxicity of black plastic utensils inspires projects that use large language models to check papers.
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Henrik Wilming @arrr.de · 07/03/2025
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
arxiv.org
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 ...
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Ulrich Pennig @pennigulrich.bsky.social · 06/03/2025
More disturbing news from Cardiff.
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Henrik Wilming @arrr.de · 05/03/2025
For this year’s #QIP2025 we sadly had to give our talk as a video. The upshot: Everyone can already watch @lvanluijk.bsky.social’s nice talk on pure state entanglement and von Neumann algebras! m.youtube.com/watch?v=U70p9sauZ_E #entanglement #quantum @stotti-alex.bsky.social
m.youtube.com
Pure state entanglement and von Neumann algebras (QIP 2025)
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