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Florian Meier

@mathsmire.bsky.social
475 followers 143 following 41 posts

Foundational questions: Raclette or Fondue? 🧀🇨🇭 What is time without entropy? 🕒 || PostDoc at TU Wien

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Reposted by Florian Meier
Alex @itsmealeale.bsky.social · 9h
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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Florian Meier @mathsmire.bsky.social · 28/08/2026
How does memory help to count? Using n bits, one can count perfectly up to 2^n. Higher numbers can only be counted on average, with an uncertainty growing with the number to be counted. We looked at how this uncertainty can be reduced when using qubits instead: arxiv.org/abs/2608.26240
Two tick distributions, on the left perfectly sharp and on the right broadly distributed around the mean.
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Jake Xuereb @curlyqubit.bsky.social · 25/08/2026
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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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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Nicolai Friis @improbabilitydrive.bsky.social · 23/02/2026
10 years after its founding, driven by the energy, enthusiasm, & dedication of the community @quantum-journal.bsky.social quietly published paper #2000 some days ago. At least I think this is a big deal, big shout out to the founders & all authors, reviewers, editors, board members & contributors!
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Alex @itsmealeale.bsky.social · 23/01/2026
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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Florian Meier @mathsmire.bsky.social · 19/01/2026
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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Nicolai Friis @improbabilitydrive.bsky.social · 20/08/2025
Glad someone took the time to debunk the (obviously nonsensical) claim that Bell inequalities could be violated w/o entanglement. It is astonishing (to say the least) that this claim was made by experienced authors & that it passed peer review in the first place, does not reflect well on the journal
arxiv.org
Bell Inequality Violations Without Entanglement? It's Just Postselection
Recently Wang et al. have reported a violation of a Bell inequality without entanglement [arXiv:2507.07756]. We show that their result is an artifact of postselection. It is well known that postselect...
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Henrik Wilming @arrr.de · 23/07/2025
A fun project with Seok Hyung, Jeongrak ( @perp-waterfall.bsky.social ), @nellynghy.bsky.social , and Paul Boes. We dusted off some old notes because there seemed to be renewed interest in what differentiates thermal operations from Gibbs-preserving maps. arxiv.org/abs/2507.16637
arxiv.org
Thermal operations from informational equilibrium
Thermal operations are quantum channels that have taken a prominent role in deriving fundamental thermodynamic limitations in quantum systems. We show that these channels are uniquely characterized by...
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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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Florian Meier @mathsmire.bsky.social · 13/06/2025
Congrats to Jake and all the collaborators for this fantastic work. They take the well studied problem of cooling quantum systems and use cool mathematics from group and graph theory to systematically characterize and solve that problem.
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Florian Meier @mathsmire.bsky.social · 02/06/2025
What started as informal discussions on the Danube beach in Vienna during QTD2023 has been published at last. Trying to come up with an experimentally feasible quantum clock we came across a rich model – the ring clock – that overturned a common wisdom in the community. doi.org/10.1038/s415...
Copyright by Alexander Rommel / TU Wien.
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ASPECTS @aspects-quantum.bsky.social · 28/04/2025
Don't forget to submit your abstract for our conference in Dublin, August 2025! www.aspects-quantum.com/flqt2025
aspects-quantum.com
FLQT 2025 — ASPECTS
Fundamental Limits of Quantum Technologies conference, Dublin, 25-29 August 2025
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Mark Mitchison @mitchison.bsky.social · 07/04/2025
We are excited for Fundamental Limits of Quantum Technologies conference, Dublin, 25-29 August. Only three weeks left until the abstract submission deadline, don't delay! All details at www.aspects-quantum.com/flqt2025
aspects-quantum.com
FLQT 2025 — ASPECTS
Fundamental Limits of Quantum Technologies conference, Dublin, 25-29 August 2025
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Jake Xuereb @curlyqubit.bsky.social · 31/03/2025
Sms alot of people wanna go to Benasque QI than one can fit in the beautiful tiny village. Having organised a bunch of stuff in Malta, I feel the urge to organise a straggler event on the island of Gozo. If interested, fill this form so I can gauge interest - share! forms.gle/azwrJe8AidrS...
forms.gle
Gozo QI - Expression of Interest
I really like no timetable free discussion workshops. It seems like the Benasque Quantum Information Workshop has gotten too many applicants to cater for the demand. Having organised a couple confer...
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Mark Mitchison @mitchison.bsky.social · 25/03/2025
We’re organising a conference in Dublin! Fundamental Limits of Quantum Technologies 2025 — everything from error mitigation on NISQ devices, through control constraints on complex quantum systems, to quantum thermodynamics and energetics, and much more! Abstract submission and registration open! 👇
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Philip Taranto 🍋 @tarantophilip.eurosky.social · 14/03/2025
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
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 ...
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Mark Mitchison @mitchison.bsky.social · 04/02/2025
Latest preprint from the ASPECTS consortium! arxiv.org/abs/2502.00096 Experiments by the amazing @naresgroup.bsky.social and theory by @mathsmire.bsky.social of @quitphysics.info We measured the entropy cost of generating and recording ticks in a microscopic clock 1/6 🧵👇
Depiction of the quantum-classical transition in a microscopic clock. A quantum clock transitions between three discrete states, driven by thermal noise. These transitions are amplified by a sensor into a classical signal, which can be shared among classical observers as an objective record of the passage of time.
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Florian Meier @mathsmire.bsky.social · 16/01/2025
Now that our recent work on the emergence of a 2nd law of thermodynamics in isolated quantum systems has been published, I thought it may be a good opportunity to share some animations outlining the intuition for the principle behind it. doi.org/10.1103/PRXQ... See thread below 👇
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Florian Meier @mathsmire.bsky.social · 06/01/2025
Bonjour Grenoble! Nice to see the beauty of the alps in Austria stretches all the way to France 🏔️ Here to visit the QEI conf. and curious to learn how others think about thermo of quantum computation. Tomorrow I'll talk about work (arXiv:2402.00111) we did in Vienna. Come by if you are around.
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Tom Rivlin @tomrivlin.com · 13/12/2024
Nice article about the history of the idea of entropy over the last 200 years. I'll have more to say about this in the new year 👀
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QuOI Theory @quoi-theory.at · 04/12/2024
Pretty cool to see some work we were involved in recognised by New Scientist as some of the 'wildest physics' they covered in 2024! www.newscientist.com/article/2458...
newscientist.com
These are the most mind-melting physics discoveries of 2024
We collected some of the wildest physics that New Scientist covered in 2024, findings that are forcing scientists – and us – to rethink reality
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