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Volker K.

@quantenvogel.bsky.social
1K followers 2.2K following 30 posts

Postdoctoral fellow in #quantum theory at the ISTA (Vienna) • Atomic & molecular physics • Non-equilibrium topological phases • Floquet engineering • Dynamical systems • #julialang • #Philosophy of Science • #firstgen • #chess & #go • lives in #wien

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Reposted by Volker K.
Ketan Joshi @ketanjoshi.co · 30/11/2025
"The IRA’s survival was premised on the logic that a loose alignment of corporations would support climate policies in exchange for subsidies and convince Republicans to get on their side. That didn’t work" Top @katearonoff.bsky.social piece in @newrepublic.com -->>>
newrepublic.com
The Quick and Shameful Death of Biden’s Biggest Policy
It was far too easy for Republicans to kill the Inflation Reduction Act. Where did those who crafted it go wrong?
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AltYellostoneNatPar @altyellonatpark.org · 06/07/2025
Today in As the World Burns A reversal of Antarctic ice formation.
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Jens Eisert @jenseisert.bsky.social · 08/06/2025
Quantum state tomography for states that vary with parameters such as time or control settings attains new capabilities in characterization of evolving quantum states. go.aps.org/3SAelEa
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Jens Eisert @jenseisert.bsky.social · 28/03/2025
"XYZ ruby code: Making a case for a three-colored graphical calculus for quantum error correction in spacetime" journals.aps.org/prxquantum/a... This work presents a new highly attractive #Floquetcode in #quantumerrorcorrection and introduces - yet another - useful graphical calculus.
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Volker K. @quantenvogel.bsky.social · 03/03/2025
Taken from this fantastic presentation www.slideshare.net/slideshow/th... by @zacklabe.com
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Zack Labe @zacklabe.com · 03/03/2025
I'd like to share another science presentation, which I gave to a class visiting GFDL almost exactly 24 hours before being fired in the NOAA mass layoffs. Unfortunately, the animations do not work in this format though: www.slideshare.net/slideshow/th.... This one has more of an Arctic focus.
slideshare.net
The Arctic through the lens of data visualization
The Arctic through the lens of data visualization - Download as a PDF or view online for free
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The Matter Lab @thematterlab.bsky.social · 03/03/2025
🔬 Object placement is a fundamental skill in chemistry labs—whether it's hanging a beaker on a rack 🧪 or inserting a vial with precision 🎯. But how can we enable robots to place different objects robustly and generalize across diverse tasks? [1/5]
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Prof Julia Steinberger 🌹🌱🌍 #ClimateAction #Fightfascism @jksteinberger.bsky.social · 08/02/2025
The neoliberal dream of fossil fuel billionaire Charles Koch was always the destruction of US democracy and the elimination of government (except for its repressive organs police, courts, prisons, military ofc), and now he has won. What now? A 🧵. 1/ t.co/FKxxmLyfce
Headline "US democracy has died"
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Kaja Kallas @kajakallas.bsky.social · 28/02/2025
Ukraine is Europe! We stand by Ukraine. We will step up our support to Ukraine so that they can continue to fight back the agressor. Today, it became clear that the free world needs a new leader. It’s up to us, Europeans, to take this challenge.
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Noam Ross @noamross.net · 27/02/2025
I grew up watching the NOAA fleet come in and out of port. What a wonder they are: big radar balls and antennae up top, cranes and winches on the back for instruments and submersibles. They inspired and gave me such pride in country and science. Solidarity and love for all my NOAA friends today. 💙
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Henrik Wilming @arrr.de · 15/02/2025
I think it would be a good time to reinstantiate the mirror network for the # arXiv. It’s an essential piece of the global research community in math, physics, computer-science and adjacent fields. Under the current circumstances it should not only be hosted in the US. #quantum #math #physics #cs
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Alt National Park Service @altnps.bsky.social · 14/02/2025
We are calling for a nationwide and international boycott of all Elon Musk-related products and services. Sell your Tesla shares, avoid buying Tesla vehicles, cancel Starlink, and delete your X accounts.
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Johanna Pirker @joeyprink.bsky.social · 07/02/2025
aaaaaaand the podcast with @ramiismail.com is online!! ..maybe it escalated a bit... (2 hours!!!!) Hope you enjoy it.. super inspiring & interesting youtu.be/qPFTzP2E-AE #gamedev #indiedev
youtu.be
Rami Ismail – From Modding to Indie Dev Icon, Nuclear Throne, PressKit & The Future of Indie Games
YouTube video by Johanna Pirker
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Leticia Madureira @leticia-madureira.bsky.social · 04/02/2025
If you’re using Julia in chemistry or materials science, we encourage you to submit a proposal to the Computational Chemistry and Materials Science Minisymposium at JuliaCon 2025 in Pittsburgh, PA, from July 21–26. @julialang.org @juliacon.bsky.social discourse.julialang.org/t/computatio...
discourse.julialang.org
Computational Chemistry and Materials Science Minisymposium: Call For Proposals
If you’re using Julia in chemistry or materials science (at all , whether or not it specifically uses JuliaMolSim ecosystem tools!), we encourage you to submit a proposal to the Computational Chemistr...
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Adrian Hill @adrianhill.de · 30/01/2025
You think Jacobian and Hessian matrices are prohibitively expensive to compute on your problem? Our latest preprint with @gdalle.bsky.social might change your mind! arxiv.org/abs/2501.17737 🧵1/8
Figure comparing automatic differentiation (AD) and automatic sparse differentiation (ASD).

(a) Given a function f, AD backends return a function computing vector-Jacobian products (VJPs). (b) Standard AD computes Jacobians row-by-row by evaluating VJPs with all standard basis vectors. (c) ASD reduces the number of VJP evaluations by first detecting a sparsity pattern of non-zero values, coloring orthogonal rows in the pattern and simultaneously evaluating VJPs of orthogonal rows. The concepts shown in this figure directly translate to forward-mode, which computes Jacobians column-by-column instead of row-by-row.
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Gary Longsine 📱 @arbiteriapetus.bsky.social · 24/01/2025
BlueSky has a chance, if we can keep the bots off the platform. That won't be easy.
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Soham Sankaran @soh.am · 23/12/2024
I recently spoke at Ethereum Devcon about PopVax (@popvax.com)'s work developing novel mRNA vaccines to save 1 million lives each year, as part of a series of talks organized by Vitalik Buterin (@vitalik.ca) around his d/acc vision – defensive, differential, and decentralized accelerationism. (1/4)
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Vitalik Buterin @vitalik.ca · 24/01/2025
On the risks of politician coins:
The risk of politician coins comes from the fact that they are such a perfect bribery vehicle. If a politician issues a coin, you do not even need to send *them* any coins to give them money. Instead, you just buy and hold the coin, and this increases the value of their holdings passively.

Furthermore, there is deniability: holding the coin is, in terms of financial effect, a linear combination of donating to the issuer and gambling. Hence you can have the intention of doing the former but when challenged claim that you are doing the latter.

You can even hold the coin privately, and show that you are holding it to whoever you need to show; you do not need any zero knowledge proofs, you just send a test transaction.

This is all risky to democracy, for reasons very similar to what I wrote in https://vitalik.eth.limo/general/2021/08/16/voting3.html , https://vitalik.eth.limo/general/2020/09/11/coordination.html and elsewhere. TLDR: the economic arguments for why markets are so great for "regular" goods and services do not extend to "markets for political influence".

I recommend politicians do not go down this path.
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Sergey Frolov🇺🇦 @spinespresso.bsky.social · 03/01/2025
Perhaps obvious, but what gives ammo to the anti-sciebtists among other things is our own failure to fix the systemic issues within the science organization, proliferation of unreliable results and flawed incentives, lazy editors unscrupulous institutions and all
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Mattia Walschaers @walschaers.eu · 06/01/2025
A little quantum discussion to start off the year. I was recently asked what is so revolutionary about Google's Willow chip. In short my answer was "nothing really, it's more of an impressive but expected evolution than a revolution.". Now I'm curious, do people in the community agree?
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Giacomo Bartolucci (he) @gbart.bsky.social · 04/01/2025
1/n Some time ago my colleague, excellent cook, and friend Ivan told me: "Cacio e pepe is the recipe that I screw up more often. Let's make a project studying systematically the physics of that sauce". Prepare to get cheesy, I'm glad to share the Cacio e paper preprint: arxiv.org/abs/2501.00536
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Quantiki @quantiki.bsky.social · 02/01/2025
Happy International Year of Quantum Science & Technology! #IYQ2025
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Joey Carpinelli @jdc.pub · 04/01/2025
I'm a huge fan of #Quarto, a (relatively) new technical publishing system. I've written a #julialang package, `DocumenterQuarto`, which automatically generates a Quarto project (e.g. website) with any Julia package's documentation!
github.com
GitHub - cadojo/DocumenterQuarto.jl: Build documentation for your Julia package with Quarto!
Build documentation for your Julia package with Quarto! - cadojo/DocumenterQuarto.jl
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Carl T. Bergstrom @carlbergstrom.com · 02/01/2025
You all said I was being paranoid and it was just coincidence. arstechnica.com/tech-policy/...
Sometimes Siri would be inadvertently activated, a whistleblower told The Guardian, when an Apple Watch was raised and speech was detected. The only clue that users seemingly had of Siri's alleged spying was eerily accurate targeted ads that appeared after they had just been talking about specific items like Air Jordans or brands like Olive Garden, Reuters noted.
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Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 02/01/2025
Paul Dirac's paper "The Quantum Theory of the Electron," in which he derived the relativistic equation for spin 1/2 particles like the electron, was submitted #OTD in 1928. It’s one of the most important results of 20th century physics, taking the deceptively simple form: i ℏ γ.∂ψ - m c ψ = 0 🧪 ⚛️
The title and opening of the paper read:

The Quantum Theory of the Electron.

By P. A. M. DIRAC, St. John's College, Cambridge.

(Communicated by R. H. Fowler, F.R.S.—Received January 2, 1928.)

The new quantum mechanics, when applied to the problem of the structure of the atom with point-charge electrons, does not give results in agreement with experiment. The discrepancies consist of " duplexity" phenomena, the observed number of stationary states for an electron in an atom being twice the number given by the theory. To meet the difficulty, Goudsmit and Uhlenbeck have introduced the idea of an electron with a spin angular momentum...Excerpt from section 3 of the paper, where Dirac shows that the equation behaves correctly under Lorentz transformations.
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Kat Robison, PhD @katrobison.bsky.social · 22/12/2024
As I get older, I get more frustrated with the lack gender equality/equity/justice. As a mother, I find it infuriating to think that my daughter may still be facing these battles when she is my age. #EverydaySexism: A short #AcademicSky story/thread starts below, which are my opinions alone.
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AltYellostoneNatPar @altyellonatpark.org · 17/11/2024
Greeting you on Bluesky with this reminder They are living, thinking, feeling beings And they deserve our respect, even if we haven't earned theirs. One love
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Adam MacLean @adamlmaclean.bsky.social · 13/12/2024
Transition paths across the EMT landscape are dictated by network logic. A 🧵 on the perils of ignoring logic in ODE models of gene regulatory networks (GRNs) 🌟 also read on if you like: EMT, bifurcations, multistability, or Waddington-esque landscapes www.biorxiv.org/content/10.1...
A figure with six panels (Fig 1B from: doi:10.1101/2024.12.03.626660). Each panel shows the transition path represented by a bifurcation plot of the response B with respect to input signal S. There are four different tristable transition paths indicated by whether or not the intermediate state is accessible, and two bistable transition paths.
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Miles Cranmer @milescranmer.bsky.social · 09/12/2024
I wrote this new symbolic differentiation engine called DynamicDiff.jl: github.com/MilesCranmer... It's really really fast at differentiating runtime-generated expressions – no compilation needed!
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Armin Thurnher @arminthurnher.bsky.social · 09/12/2024
Als der Kolumnist am 8.12. Syrer vor dem Parlament die Befreiung von Assad feiern sah, begann er über die Uneindeutigkeit historischer Wendepunkte nachzudenken, die er erlebt hat. Seuchenkolumne 1445 www.falter.at/seuchenkolum...
falter.at
Syrien. Glorie und Ungewissheit des geschichtlichen Augenblicks. - FALTER.at
Seuchenkolumne. Nachrichten aus der vervirten Welt 1445
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priscilla page @priscillapage.bsky.social · 08/12/2024
John Atkinson Grimshaw's Park Row, Leeds, oil on canvas, 1882
painting of cityscape at twilight. there is a full moon surrounded by clouds in a gray night sky tinted with green. the moon and the orange light from gas lamps illuminate a cobblestone street, burnishing it with a green-and-gold glow. in the distance, you can see dark silhouettes of carriages and people. we see the left side of the street head on, so details of buildings are scant except for a wood awning. to the right, though, the exteriors of Victorian buildings are detailed - the one closest to us looks like it's made of brick. at the very end of the street is a ghostly building - probably a church tower with a spire.
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Anubhav Jain @anubhavj480.bsky.social · 04/12/2024
Have you ever wondered why diffusion models memorize and all initializations lead to the same training sample? As we show, this is because like in dynamic systems, the memorized sample acts as an attractor and a corresponding attraction basin is formed in the denoising trajectory.
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Johannes Köpl @johanneskoepl.bsky.social · 23/11/2024
🇦🇷 Es ist Zeit für meinen ersten Thread hier zu Argentinien (für meine Treuen Twitter-Follower, die hierher migriert sind). Also: was hat sich in der letzten Woche dort getan? So viel Irrsinn, dass es mal wieder auf keine Kuhaut geht. Eine Übersicht, ohne Anspruch auf Vollständigkeit. 🧵
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Paolo Crosetto @paolocrosetto.bsky.social · 13/11/2024
To celebrate my moving to BlueSky I am giving away LaTeX goodies. Always wanted to have a clean, nice-looking, readable, complete and supporting visual track changes reply to referees? Look no more: the template you're looking for is here: github.com/paolocrosett... Happy BlueSkying to everyone.
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Georg Hanisch 🖇️ @georghanisch.org · 01/12/2024
"Wir rutschen vom Zeitalter der Aufklärung in einen trügerischen Sumpf von Falschinformation, Desinformation, Mikrotargeting."
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Jacob S. Zelko @thecedarprince.bsky.social · 30/11/2024
🤔💭: Applied Category Theory and starting ACT projects. Working with GATAS and Topos Inst. these past few years on AlgebraicJulia and I think we are at a critical point. 🧪 Anyone interested in ACT projects with applications spanning public health, mathematics, ABMs, etc? #mathsky #medsky
algebraicjulia.org
AlgebraicJulia
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Andreas Wallraff @andreasateth.bsky.social · 30/11/2024
Let me know if you want your #quantum tagged posts to be listed in this quantum feed: bsky.app/profile/did:... .
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Maris Ozols @marisozols.bsky.social · 30/11/2024
If you're curious about quantum computing and want to learn the basics, check out the "Quantum Quest" created by me and Michael Walter! www.quantum-quest.org/material
quantum-quest.org
The Quantum Quest - Material
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Guillaume Dalle @gdalle.bsky.social · 29/11/2024
Do machine learning researchers need intercontinental flights to prove their worth? Or can we rethink our customs so that academic impact doesn’t require excessive CO2 emissions? If you believe such change is possible, local meetups for @neuripsconf.bsky.social and other events are the way to go!
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Volker K. @quantenvogel.bsky.social · 27/11/2024
The ruble is plummeting, hitting 110,250 RUB/$ and showing no signs of stabilizing. The Russian Central Bank's move to raise interest rates to 21% (soon, in December, 22%) during the last months appears pretty ineffective in stopping the currency's free fall tradingeconomics.com/russia/inter...
tradingeconomics.com
Russia Interest Rate
The benchmark interest rate in Russia was last recorded at 21 percent. This page provides the latest reported value for - Russia Interest Rate - plus previous releases, historical high and low, short-...
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Prof. Anders Levermann, PhD @alevermann.bsky.social · 19/11/2024
Increase in economic risk from weather extremes via global supply chains. US and China are most vulnerable, but also Europe is strongly affected. www.nature.com/articles/s41...
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Mattia Walschaers @walschaers.eu · 26/11/2024
I'm not sure how many of you are like me, but I listen to a lot of podcasts. Usually, I tend to go to history podcast (👋 @empirepoduk.bsky.social), but there is a bunch of good quantum pods out there too. So buckle up Quantum people, let's make a little 🧵
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Volker K. @quantenvogel.bsky.social · 25/11/2024
The only thing I'm really sad about as my PhD nears its end are the many aspects I couldn't dive into - fractal dimensions, quasi-periodic structures, quantum groups, or non-abelian path integrals. I'm not sure I will ever have such a long period of time again to deeply immerse myself into ideas. 🥲
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Steven Thomson @physicssteve.bsky.social · 25/11/2024
Incredibly exciting (for me, at least) to see the first paper out based on the Tensor Flow Equation method that I developed. The authors investigate Stark many-body localisation in 1D and 2D and find some intriguing results! arxiv.org/abs/2411.14527
arxiv.org
Investigating Stark MBL with Continuous Unitary Transformation Flows
We investigate the ergodicity-to-localization transition in interacting fermion systems subjected to a spatially uniform electric field. For that we employ the recently proposed Tensorflow Equations (...
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Alexander Van der Bellen @bundespraesident.at · 24/11/2024
#OnThisDay, 35 years ago, the Velvet Revolution led to the resignation of the leadership of the Communist Party of Czechoslovakia. Congratulations to our Czech and Slovak friends on 35 years of #freedom and #democracy. (1/3)
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Dr. Aaron Thierry @thierryaaron.bsky.social · 22/11/2024
Looking for books to get for #climate curious friends & family this Christmas🎄? Here are 6 of my favourites reads this year. First up @doctorvive.bsky.social's indispensable guide to talking climate action & fighting fossil fuel propaganda 🧵
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Andrew D Thaler @drandrewthaler.bsky.social · 18/10/2024
There's been an avalanche of new sign ups, so it's time for reintroductions. Hi. I'm Andrew. I am a deep-sea ecologist and conservation technologist. My work orbits around how humans use and misuse technology to explore, exploit, protect, and plunder the hardest to reach places on the planet.
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