Alexander Stottmeister
@stotti-alex.bsky.social
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.
Reposted by Alexander Stottmeister
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/article/10.1...
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...
link.springer.com
October 30, 2025 at 7:16 PM
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/article/10.1...
Even if you think you are not interested, you should take a look 😅.
Interested in entanglement theory for systems with infinitely many degrees of freedom? Take a look at my PhD thesis, now available on the arXiv 🥳 arxiv.org/abs/2510.07563
Entanglement in von Neumann Algebraic Quantum Information Theory
In quantum systems with infinitely many degrees of freedom, states can be infinitely entangled across a pair of subsystems, but are there different forms of infinite entanglement? To understand entang...
arxiv.org
October 13, 2025 at 10:44 AM
Even if you think you are not interested, you should take a look 😅.
Reposted by Alexander Stottmeister
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!
September 30, 2025 at 4:54 PM
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!
Reposted by Alexander Stottmeister
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.
Ins eigene Fleisch: Warum Kürzungen an Hochschulen allen schaden
von Amrei Bahr und Kristin Eichhorn
steady.page
September 23, 2025 at 7:07 AM
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.
Reposted by Alexander Stottmeister
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.
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.
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...
arxiv.org
September 22, 2025 at 5:40 AM
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.
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.
Reposted by Alexander Stottmeister
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/abs/2509.12911
The paper investigates bipartitions of quantum systems with infinitely many degrees of freedom. Small thread below 👇
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...
arxiv.org
September 17, 2025 at 10:22 AM
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/abs/2509.12911
The paper investigates bipartitions of quantum systems with infinitely many degrees of freedom. Small thread below 👇
Reposted by Alexander Stottmeister
🥳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! 🙏
This would not have been possible without my fantastic collaborators and supervisors. A big "thank you" to all of you! 🙏
📣 The ERC Starting Grant call results are out!
Find out which early-career researchers will receive funding this year, what they will be investigating, where they will be based... plus lots of other #ERCStG facts & figures for 2025!
➡️ buff.ly/IsafuFh
#FrontierResearch 🇪🇺#EUfunded #HorizonEurope
Find out which early-career researchers will receive funding this year, what they will be investigating, where they will be based... plus lots of other #ERCStG facts & figures for 2025!
➡️ buff.ly/IsafuFh
#FrontierResearch 🇪🇺#EUfunded #HorizonEurope
September 4, 2025 at 10:21 AM
🥳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! 🙏
This would not have been possible without my fantastic collaborators and supervisors. A big "thank you" to all of you! 🙏
Reposted by Alexander Stottmeister
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...
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.
newsletter.ofthebrave.org
August 18, 2025 at 3:45 PM
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...
Reposted by Alexander Stottmeister
I have some related posts on this at mathstodon.xyz/@tao/1149568... and mathstodon.xyz/deck/@tao/11...
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...
mathstodon.xyz
August 8, 2025 at 12:49 AM
I have some related posts on this at mathstodon.xyz/@tao/1149568... and mathstodon.xyz/deck/@tao/11...
Reposted by Alexander Stottmeister
#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
giving.ucla.edu/Campaign/Donat
www.ipam.ucla.edu
August 8, 2025 at 12:48 AM
#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
giving.ucla.edu/Campaign/Donat
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.
August 7, 2025 at 9:21 AM
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.
Reposted by Alexander Stottmeister
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
arxiv.org/abs/2508.03731
August 7, 2025 at 7:38 AM
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
arxiv.org/abs/2508.03731
Reposted by Alexander Stottmeister
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/@tao/1149568...
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...
mathstodon.xyz
August 2, 2025 at 6:27 PM
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/@tao/1149568...
Reposted by Alexander Stottmeister
For the math folks on here: NSF has suspended Terry Tao's grant. www.nsf.gov/awardsearch/...
NSF Award Search: Award # 2347850
Structure theory for measure-preserving systems, additive combinatorics, and correlations of multiplicative functions
www.nsf.gov
July 31, 2025 at 10:44 PM
For the math folks on here: NSF has suspended Terry Tao's grant. www.nsf.gov/awardsearch/...
Reposted by Alexander Stottmeister
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/papers/q-202...
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...
quantum-journal.org
July 30, 2025 at 6:20 PM
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/papers/q-202...
Reposted by Alexander Stottmeister
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-...
www.scientificamerican.com/article/can-...
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
www.scientificamerican.com
July 25, 2025 at 7:20 AM
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-...
www.scientificamerican.com/article/can-...
Reposted by Alexander Stottmeister
Henrik will soon talk about entanglement in the thermodynamic limit at LUH :).
July 21, 2025 at 9:50 AM
Henrik will soon talk about entanglement in the thermodynamic limit at LUH :).
Reposted by Alexander Stottmeister
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
We're organising a focused, community-driven conference at Leibniz Universität Hannover, hosted by Prof. Robert Raussendorf.
🗓️ Save the date: August 27–29, 2025
July 18, 2025 at 6:57 AM
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
We're organising a focused, community-driven conference at Leibniz Universität Hannover, hosted by Prof. Robert Raussendorf.
🗓️ Save the date: August 27–29, 2025
Reposted by Alexander Stottmeister
don't despair! there is still quantum...
July 14, 2025 at 8:12 PM
don't despair! there is still quantum...
Reposted by Alexander Stottmeister
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...
A long read, but fascinating and moving.
Link: nautil.us/finding-pete...
Finding Peter Putnam
The forgotten janitor who discovered the logic of the mind
nautil.us
July 3, 2025 at 8:11 AM
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...
A long read, but fascinating and moving.
Link: nautil.us/finding-pete...
Reposted by Alexander Stottmeister
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/news/2025-06...
Paper: www.nature.com/articles/s41...
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...
phys.org
June 23, 2025 at 6:57 AM
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/news/2025-06...
Paper: www.nature.com/articles/s41...
Reposted by Alexander Stottmeister
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
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.
sites.google.com
June 5, 2025 at 8:56 PM
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
For those wondering what embezzlement of entanglement is, I have heard from Henrik (@arrr.de) that the Cambridge Dictionary is preparing an updated version…
May 27, 2025 at 10:24 AM
For those wondering what embezzlement of entanglement is, I have heard from Henrik (@arrr.de) that the Cambridge Dictionary is preparing an updated version…
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.
www.nature.com/articless415...
Another intense collaboration with the great Lauritz (@lvanluijk.bsky.social) & Henrik (@arrr.de).
Below is the former Twitter thread.
www.nature.com
May 27, 2025 at 10:01 AM
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.
www.nature.com/articless415...
Another intense collaboration with the great Lauritz (@lvanluijk.bsky.social) & Henrik (@arrr.de).
Below is the former Twitter thread.
Reposted by Alexander Stottmeister
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/2025/05/14/p...
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...
blog.tib.eu
May 14, 2025 at 2:50 PM
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/2025/05/14/p...