Korbinian Kottmann
@qottmann.bsky.social
๐ค 675
๐ฅ 293
๐ 183
Quantum compilation & open source software. working on pennylane.ai
Everything makes so much more sense once you realize whether you are a lumper or a splitter
en.wikipedia.org/wiki/Lumpers...
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Lumpers and splitters - Wikipedia
https://en.wikipedia.org/wiki/Lumpers_and_splitters
23 days ago
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First time I'm seeing
arxiv.wiki
(it's now (?) automatically linked on scirate. Looks like a great initiative, right up my alley!
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arXiv.wiki: enriched e-Prints
https://arxiv.wiki/
about 2 months ago
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Genuine question as I am not up to date: were there major innovations in neutral atom computing that circumvent the problem of having to physically shuttle atoms, leading to unfortunate (logical) clock rates?
2 months ago
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you know how they say, sometimes 115 quantikz circuit diagrams say more than a thousand words.. new preprint "parameter-optimal unitary synthesis with flag decompositions" w/
@dwierichs.bsky.social
Guillermo and Nathan
scirate.com/arxiv/2603.2...
2 months ago
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typos ftw: I'd much rather read your raw scribblings than your polished and soulless AI-generated deliberations
3 months ago
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@mozilla.org
Firefox lowkey the best browser for these two features alone: - cmd+tab cycles through tabs in recently used order - you can go back and forth between hyperlinks _within_ a pdf using the back and forward buttons
3 months ago
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reposted by
Korbinian Kottmann
Riverlane
4 months ago
Thinking about a career in
#quantumcomputing
but don't have a
#quantum
#physics
degree? ๐ค You might be surprised! Our head of talent, Emily, shares crucial insights in her latest post, debunking common myths and offering practical advice for anyone looking to enter this exciting field... ๐งช๐งต1/5
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Another way to view it: Great! Now we have a very good initial state in form of that MPS to run quantum algorithms on ๐
add a skeleton here at some point
5 months ago
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Anybody with experience using / contributing to
www.qeios.com
?
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Qeios - Research you can trust
The Open Science platform reshaping scholarly communication.
https://www.qeios.com/
5 months ago
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That's the most positive blog I've read from Scott Aaronson
scottaaronson.blog?p=9425
5 months ago
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PSA: papers from early 2023 are three years old now.
5 months ago
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I will not tire of whining about overleaf and quantikz speeds
6 months ago
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All I want for christmas is a (better) quantikz equivalent for
@typst.app
(and arxiv+journal support) Using
overleaf.com
after
typst.app
just feels like going around in a horse-drawn carriage in 2025 - gets you from A to B, and is kinda cool and vintage, but just extremely slow and cumbersome.
7 months ago
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I heard someone say reverting daylight saving time in October is like "trading one hour of sleep (once) for five months of darkness" and now I cant unhear it.
7 months ago
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In case you haven't already: there is one more week to fill the
@unitary.foundation
quantum OSS survey for anyone using or developing qc software
unitary.foundation/posts/2025_q...
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The 2025 QOSS Survey is Open! - Unitary Foundation
Unitary Foundation
https://unitary.foundation/posts/2025_qoss_survey/
8 months ago
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It is that time of year again! The
@unitary.foundation
qOSS survey is here! Please consider filling it out if you are using, developing or maintaining any quantum OSS like
@pennylaneai.bsky.social
or similar
unitary.foundation/posts/2025_q...
9 months ago
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reposted by
Korbinian Kottmann
Craig Gidney
10 months ago
The first novel thing I did in quantum computing was find a way add +1 to a register using O(1) space and O(n) gates. For 10 years I've wanted to know how to generalize that from x+=1 to x+=C... and I finally figured out a way to do it!
arxiv.org/abs/2507.23079
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reposted by
Korbinian Kottmann
Joseph Bowles
10 months ago
New opening in the QML team @ Xanadu!
xanadu.applytojob.com/apply/v1gc8F...
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Quantum Machine Learning Researcher (Remote) - Xanadu - Career Page
Apply to Quantum Machine Learning Researcher (Remote) at Xanadu in Toronto, ON, Canada.
https://xanadu.applytojob.com/apply/v1gc8Fr222/Quantum-Machine-Learning-Researcher-Remote
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I'm giving an (online) talk next Monday. Be there or be square ๐ฅ
www.thewiser.org/agenda
11 months ago
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Spotted: A photonic GKP state in the wild ๐ต๏ธโโ๏ธ so cool to see!
www.nature.com/articles/s41...
12 months ago
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reposted by
Korbinian Kottmann
Ross Duncan
12 months ago
Job ad ๐งต 2/2 Quantinuum are looking for software engineer to help design and implement quantum programming languages. You need to have OPINIONS about types. Full-time, permanent, based in Cambridge in England.
#jobad
#quantum
#quantumcomputing
#pl
#proglang
jobs.eu.lever.co/quantinuum/6...
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Quantinuum - Research Software Engineer - Quantum Error Correction
Quantinuum are hiring a research software engineer to work on compilation of fault-tolerant quantum software for the next generation of quantum computers. Quantum software relies on quantum error corr...
https://jobs.eu.lever.co/quantinuum/d081de54-1194-4351-a390-2eb734d540c3
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reposted by
Korbinian Kottmann
Ross Duncan
12 months ago
Job ad ๐งต 1/2 Quantinuum are looking for QEC person to join our compiler team. Ideally you know lots about QEC and a bit about compilers but the other way could work too. Full-time, permanent, based in Cambridge in England.
#jobad
#quantum
#quantumcomputing
#qec
jobs.eu.lever.co/quantinuum/d...
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Quantinuum - Research Software Engineer - Quantum Error Correction
Quantinuum are hiring a research software engineer to work on compilation of fault-tolerant quantum software for the next generation of quantum computers. Quantum software relies on quantum error corr...
https://jobs.eu.lever.co/quantinuum/d081de54-1194-4351-a390-2eb734d540c3
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Trying to understand fault tolerant architectures without getting into the nitty gritty details of surface code physics: The Game of Surface Codes ๐
pennylane.ai/qml/demos/tu...
12 months ago
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reposted by
Korbinian Kottmann
Louis Vignoli
about 1 year ago
arxiv.org/abs/2505.15917
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we're starting an encyclopedia style database for passes and concepts in quantum compilation
pennylane.ai/compilation
what sort of things would people expect and like to see here?
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Quantum Compilation โ PennyLane
Reduce the size of your circuits to run them on next-generation quantum computing hardware. Find explanations and implementations of key compilation techniques.
https://pennylane.ai/compilation
about 1 year ago
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reposted by
Korbinian Kottmann
Craig Gidney
about 1 year ago
Consider this a warning. Factoring small numbers is a bad benchmark. Because the key to factoring small numbers isnโt making the quantum computer "work well". Thatโs the key to factoring *large* numbers. For small numbers it's sufficient to generate a far-too-large circuit, and light the fuse.
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reposted by
Korbinian Kottmann
Daniel Gonzรกlez
about 1 year ago
I am very happy to announce that I will soon join
@iftuamcsic.bsky.social
as a Ramon y Cajal Fellow โผ๏ธ I am also offering a PhD position on "Quantum Algorithms for High-Energy Physics" โ๏ธ Deadline is April 30 and the details can be found here:
www.gonzalez-cuadra.com/open-positions
Please share!
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Gonzรกlez-Cuadra Group @ IFT - Open positions
PhD position in Quantum Algorithms for High-Energy Physics (currently open)
https://www.gonzalez-cuadra.com/open-positions
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What I gather from the most recent DWAVE saga. TLDR: I don't think the spoofers have a done a very good or convincing job here ๐คท
about 1 year ago
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reposted by
Korbinian Kottmann
Eli LF
over 1 year ago
For a little bit of light in these trying times, I present to you: quantum memes! These are made by my Physics 438a class for extra credit on their midterm (which they are taking at this moment). As always, I take all credit for good memes and no blame for bad ones.
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Any high level but technical explanations of DeepSeek that doesnt talk about nvidia stock out there? How did they build something seemingly competitive / superior with much fewer means?
over 1 year ago
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reposted by
Korbinian Kottmann
Giuseppe Carleo
over 1 year ago
Looking for a talented postdoc to join my group (the Computational Quantum Science Lab) at EPFL, in Lausanne ๐จ๐ญ Research Topics Include: Neural Quantum States, Many-Body Systems, Ab-Initio & Quantum Chemistry...etc Start: Fall 2025, excellent conditions Apply:
www.epfl.ch/labs/cqsl/jo...
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Job Opportunities at CQSL
At the Computational Quantum Science Lab we typically have several openings yearly (at the PhD/ Postdoc level). Applications are reviewed twice a year, at the beginning of April and at the beginning o...
https://www.epfl.ch/labs/cqsl/job-opportunities-at-cqsl/
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high praise
add a skeleton here at some point
over 1 year ago
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when you accidentally drink non-decaf coffee and your brain is yelling every thought aaaaaaaaaa
over 1 year ago
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reposted by
Korbinian Kottmann
Joseph Bowles
over 1 year ago
We recently released a software package to optimize IQP circuits that scales to millions of qubits and gates. Our main motivation was quantum machine learning (paper on the way!), but we believe there could be many other applications.
arxiv.org/abs/2501.04776
github.com/XanaduAI/iqp...
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IQPopt: Fast optimization of instantaneous quantum polynomial circuits in JAX
IQPopt is a software package designed to optimize large-scale instantaneous quantum polynomial circuits on classical hardware. By exploiting an efficient classical simulation algorithm for expectation...
https://arxiv.org/abs/2501.04776
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Do you remember the feeling when you finally fully grasped SVD and realized your linear algebra powers have no limits now? You can re-live that moment by learning about the KAK decomposition for the unitary group!
pennylane.ai/qml/demos/tu...
awesome summary by
@dwierichs.bsky.social
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The KAK decomposition | PennyLane Demos
Learn about the KAK decomposition and how it powers circuit decompositions.
https://pennylane.ai/qml/demos/tutorial_kak_decomposition
over 1 year ago
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Happy np.sum(np.arange(10)**3) erveryone!
over 1 year ago
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Seeing our software and resources be used by other researchers and practitioners in the qc space gives me extreme "academic pride", for a lack of better words ๐ฅฒ ๏ปฟ Here's to more well-documented code in 2025
over 1 year ago
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I can do a computation on my smartphone in a few seconds that would take the Antikythera mechanism longer than the age of the universe. Therefore we must live in a multiverse โก (or at least my smartphone lives in one)
add a skeleton here at some point
over 1 year ago
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reposted by
Korbinian Kottmann
Gergely Orosz
over 1 year ago
History doesn't repeat - but sometimes it rhymes. In the 2010s, tiny dev teams built products w massive impact. A company with just 13 developers served 30M users. In 2024, a company with just 15 developers is serving 25 million users. Bluesky deepdive:
newsletter.pragmaticengineer.com/p/bluesky
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That whole septillion years bit is so misleading and prone for misinterpretation, I'm not even mad people outside the academic bubble take it the wrong way (though the confidence of some people with their hot takes is honestly mind-boggling and hilarious)
over 1 year ago
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TFW *gets error message* *checks code* code seems fine, let's run the same code again *gets same error message* *surprise* ๐ค
over 1 year ago
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I think we can slowly start to call X, formerly known as Twitter, X, and BlueSky, Twitter
over 1 year ago
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Beautiful
add a skeleton here at some point
over 1 year ago
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Are there already established de-facto standards for quantum compilation passes? (FT / NISQ) Stuff like TODD, ZX full_optimize, ... ? What else?
over 1 year ago
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learned that overleaf is down today, so a good chance to advertise
typst.app
it's a "new latex" if you will. once you go typst, writing latex (and using overleaf) will feel like ancient technology, so use with caution (in particular if you still depend on latex submissions to journals ๐ฌ)
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Typst: Compose papers faster
Focus on your text and let Typst take care of layout and formatting. Sign up now and speed up your writing process.
https://typst.app
over 1 year ago
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The prospect of doing a serious application with 10^7 Toffoli gates on 117 (logical) qubits is exciting! ๐
arxiv.org/abs/2411.13669
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Quantum Algorithm for Vibronic Dynamics: Case Study on Singlet Fission Solar Cell Design
Vibronic interactions between nuclear motion and electronic states are critical for the accurate modeling of photochemistry. However, accurate simulations of fully quantum non-adiabatic dynamics are o...
https://arxiv.org/abs/2411.13669
over 1 year ago
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reposted by
Korbinian Kottmann
Kartik
over 1 year ago
Just created a Quantum Computing Starter Pack. Please reach out if I missed to add you.
go.bsky.app/KBgRwmZ
add a skeleton here at some point
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It drives me nuts that the notation of the time-ordered exponential implies that it is a function Texp(โ) with an integral as its argument inside ๐คฌ Full rant:
pennylane.ai/blog/2024/09...
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What is the time-ordered exponential and why you should stop using it | PennyLane Blog
A highly opinionated quick rant about the time-ordered exponential operator, why its notation is misleading, why the time-ordering business is unnecessary and why we should just stop using it.
https://pennylane.ai/blog/2024/09/time_ordered_exponential
over 1 year ago
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reposted by
Korbinian Kottmann
ieva
over 1 year ago
I guess it makes sense to have a re-introductory post now that I'm here more! Hi, I'm Ieva (with an 'i'), I work on quantum algorithms at a startup called Phasecraft in London and I enjoy pondering cool and sometimes silly math/science questions :)
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I tried to write up an intro to (dynamical) Lie algebras for quantum practicioners as the topic keeps poping up
pennylane.ai/qml/demos/tu...
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Introducing (Dynamical) Lie Algebras for quantum practitioners | PennyLane Demos
A gentle introduction to Lie theory covering the basics of Lie algebras and Lie groups in the context of quantum computing.
https://pennylane.ai/qml/demos/tutorial_liealgebra
over 1 year ago
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