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Sun Woo Kim

@sunwoopkim.bsky.social
618 followers 211 following 215 posts

Theoretical physicist. Student researcher at Google Quantum AI and PhD candidate at King's College London. Same handle on 🐦 and 🐘. Personal website: sunwoo-kim.github.io

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Sun Woo Kim @sunwoopkim.bsky.social · 9h
Man I looked at ONE picture of a mushroom and now my entire feed is #shroomscrolling
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Sun Woo Kim @sunwoopkim.bsky.social · 02/10/2026
Constant number of submissions to arxiv every month
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Sun Woo Kim @sunwoopkim.bsky.social · 02/10/2026
Constant number of submissions to arxiv every month
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Dr Hannah M. Rowland @hannahmrowland.bsky.social · 01/10/2026
Hope your day was better than Darwin’s, on this day 165 years ago
I am very poorly today & very stupid & hate everybody &everything.

Charles Darwin
Letter to Charles Lyell
1st October 1861
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Sun Woo Kim @sunwoopkim.bsky.social · 02/10/2026
Really depends on what you allow for minimum hole radius
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Sun Woo Kim @sunwoopkim.bsky.social · 02/10/2026
Don't read papers, force the authors to explain them to you.
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Sun Woo Kim @sunwoopkim.bsky.social · 02/10/2026
Thank god: 2 submissions per month limit on arXiv. blog.arxiv.org/2026/10/01/u...
blog.arxiv.org
Fair Moderation, Equitable Access, and AI: arXiv’s Updated Rate Limit Policy
arXiv, and the scientific community at large, are facing a watershed moment. Scholarly publishing is currently changing at a rapid pace, and we are seeing a…
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Sun Woo Kim @sunwoopkim.bsky.social · 30/09/2026
So which are the stagnant fields? 🤠
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John C. Baez @johncarlosbaez.bsky.social · 06/09/2026
Joan Birman is amazing! www.nytimes.com/2026/09/06/s...
nytimes.com
The 92-Year-Old Mathematician and the Teenage Apprentice (Gift Article)
Joan Birman thought her major discoveries were behind her. Then came an email from a young neighbor — a girl who knew little but wanted to learn.
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Sun Woo Kim @sunwoopkim.bsky.social · 02/09/2026
Interesting thought experiment: if you had noise-cancelling headphones that had 'antennas', such that you place microphones further away from your head (to get early warning of sounds), how long would the antennas have to be such that you can cancel out gunshots?
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Sun Woo Kim @sunwoopkim.bsky.social · 02/09/2026
Interesting thought experiment: if you had noise-cancelling headphones that had 'antennas', such that you place microphones further away from your head (to get early warning of sounds), how long would the antennas have to be such that you can cancel out gunshots?
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Sun Woo Kim @sunwoopkim.bsky.social · 25/08/2026
features: (a) you can add to the end of the url to specify cities, e.g. #newyork,london,paris. (b) responsive design so it should work on your phone too. (c) when you scroll the city names are persistent. (d) click on a time to highlight
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Sun Woo Kim @sunwoopkim.bsky.social · 25/08/2026
Don't you hate trying to organise a 3-way meeting between academics that live in 3 different timezones? Well, I did. Here's a tool to visualise multiple timezones + dates at the same time (vibe-coded with lots torturing of LLM to get precisely what I wanted). sunwoo-kim.github.io/tools/timesy...
sunwoo-kim.github.io
timesync
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Sun Woo Kim @sunwoopkim.bsky.social · 22/08/2026
ah yes "equation two hat starred implies equation two hat"
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Sun Woo Kim @sunwoopkim.bsky.social · 13/08/2026
Happy to have this work from last year out on Nature Communications! We show that one can start from the microscopic rules of an artificial system (many-body circuits) to derive quantitatively exact hydrodynamics. (1/3) www.nature.com/articles/s41...
nature.com
Circuits as a simple platform for the emergence of hydrodynamics in deterministic chaotic many-body systems - Nature Communications
The emergence of hydrodynamics in many-body systems is a fundamental phenomenon that has long puzzled physicists, particularly in understanding how macroscopic behavior arises from microscopic determi...
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Sun Woo Kim @sunwoopkim.bsky.social · 15/08/2026
But then it's just 'PR'
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Sun Woo Kim @sunwoopkim.bsky.social · 13/08/2026
Thanks to collaborators Friedrich Hübner, Juan Garrahan, and Benjamin Doyon. (3/3)
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Sun Woo Kim @sunwoopkim.bsky.social · 13/08/2026
We used this to show exact KPZ scaling, first time in a deterministic chaotic system with one conserved quantity! This setup gives a controlled environment to test hydrodynamical theories; we expect it to be useful in the future. (2/3)
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Sun Woo Kim @sunwoopkim.bsky.social · 13/08/2026
Happy to have this work from last year out on Nature Communications! We show that one can start from the microscopic rules of an artificial system (many-body circuits) to derive quantitatively exact hydrodynamics. (1/3) www.nature.com/articles/s41...
nature.com
Circuits as a simple platform for the emergence of hydrodynamics in deterministic chaotic many-body systems - Nature Communications
The emergence of hydrodynamics in many-body systems is a fundamental phenomenon that has long puzzled physicists, particularly in understanding how macroscopic behavior arises from microscopic determi...
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Sun Woo Kim @sunwoopkim.bsky.social · 11/08/2026
No, it's clearly a hat.
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Sun Woo Kim @sunwoopkim.bsky.social · 11/08/2026
First one looks like toxic gas!
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Sun Woo Kim @sunwoopkim.bsky.social · 04/08/2026
Yeah, I've hardly seen any posts on new papers these days, and those posts also don't seem to get any engagement...
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depths of wikipedia @depthsofwikipedia.bsky.social · 02/08/2026
she's so real for that
The accidental breaking of a seagull's neck during filming affected Barbara Hershey sufficiently for her to change her surname to Seagull for a couple of years.[6]
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Sun Woo Kim @sunwoopkim.bsky.social · 27/07/2026
Famously, quantum error-correction on the toric code under bit-flip errors maps to the random-bond Ising model. But what about general noise (e.g. amplitude damping) and non-abelian codes (e.g. string-net)? scirate.com/arxiv/2607.2... (1/2)
scirate.com
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Sun Woo Kim @sunwoopkim.bsky.social · 27/07/2026
With Max McGinley, we came up with a very general and mathematically rigorous technique to bound recovery thresholds and diagonose mixed-state topological order. Excited to have it out, let us know what you think! (2/2)
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Sun Woo Kim @sunwoopkim.bsky.social · 27/07/2026
Famously, quantum error-correction on the toric code under bit-flip errors maps to the random-bond Ising model. But what about general noise (e.g. amplitude damping) and non-abelian codes (e.g. string-net)? scirate.com/arxiv/2607.2... (1/2)
scirate.com
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Sun Woo Kim @sunwoopkim.bsky.social · 21/07/2026
I'm starting as a student researcher at Google Quantum AI in Goleta, California for a year. Please reach out if you're in Goleta or the Santa Barbara area!
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Sun Woo Kim @sunwoopkim.bsky.social · 21/07/2026
In Go in Korea nowadays all the top pros try to learn moves from models. I saw a video that measured how similar a player's moves are to that of the top model. The most highly rated player had moves most similar to the model. He also beat the top model recently, albeit starting with 2 points ahead.
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Sun Woo Kim @sunwoopkim.bsky.social · 10/07/2026
What's the scaling parameter here?
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Sun Woo Kim @sunwoopkim.bsky.social · 22/06/2026
Maybe best to send them an email letting them know so they have a chance to edit it..
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Sun Woo Kim @sunwoopkim.bsky.social · 22/06/2026
Under new arXiv regulations this is a straight one-year ban followed by being unable to post a preprint before accepted into a journal for life, for every author on the paper, right?
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Sun Woo Kim @sunwoopkim.bsky.social · 19/06/2026
Cool! A question: how do you get around the Bravyi-Terhal-Poulin bounds?
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Sun Woo Kim @sunwoopkim.bsky.social · 12/06/2026
'Solvable' circuits, such as dual-unitaries, have gained attention recently as a paradigm of tractable many-body dynamics. With Friedrich Hübner, we came up with necessary and sufficient conditions for any (1+1)D circuit to be 'influence-solvable'. Happy to hear thoughts! arxiv.org/abs/2606.12538
arxiv.org
Influence-solvability: a systematic theory of $(1+1)D$ solvability and its application to brickwork circuits
`Solvable' circuits, such as dual unitaries and its generalisations, have arisen as paradigmatic examples of tractable chaotic non-equilibrium dynamics, both in classical and quantum systems. However,...
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Sun Woo Kim @sunwoopkim.bsky.social · 12/06/2026
'Solvable' circuits, such as dual-unitaries, have gained attention recently as a paradigm of tractable many-body dynamics. With Friedrich Hübner, we came up with necessary and sufficient conditions for any (1+1)D circuit to be 'influence-solvable'. Happy to hear thoughts! arxiv.org/abs/2606.12538
arxiv.org
Influence-solvability: a systematic theory of $(1+1)D$ solvability and its application to brickwork circuits
`Solvable' circuits, such as dual unitaries and its generalisations, have arisen as paradigmatic examples of tractable chaotic non-equilibrium dynamics, both in classical and quantum systems. However,...
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Sun Woo Kim @sunwoopkim.bsky.social · 04/06/2026
Stop littering rubber bands, Sam!
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Sun Woo Kim @sunwoopkim.bsky.social · 20/05/2026
where are they taking him
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Sun Woo Kim @sunwoopkim.bsky.social · 19/05/2026
coupling from the past or nothing
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Mark Riedl @markriedl.bsky.social · 14/05/2026
ArXiV has a new LLM policy (Screenshots with alt text so you don’t have to click through to the other place and see all the stupid responses)
Attention @arxiv authors: Our Code of Conduct states that by signing your name as an author of a paper, each author takes full responsibility for all its contents, irrespective of how the contents were generated. 1/If generative AI tools generate inappropriate language, plagiarized content, biased content, errors, mistakes, incorrect references, or misleading content, and that output is included in scientific works, it is the responsibility of the author(s). 2/

We have recently clarified our penalties for this. If a submission contains incontrovertible evidence that the authors did not check the results of LLM generation, this means we can't trust anything in the paper. 3/The penalty is a 1-year ban from arXiv followed by the requirement that subsequent arXiv submissions must first be accepted at a reputable peer-reviewed venue. 4/

Examples of incontrovertible evidence: hallucinated references, meta-comments from the LLM ("here is a 200 word summary; would you like me to make any changes?"; "the data in this table is illustrative, fill it in with the real numbers from your experiments") end/
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Sun Woo Kim @sunwoopkim.bsky.social · 15/05/2026
My upcoming paper has 200+ hand-drawn diagrams... It's living hell.
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Sun Woo Kim @sunwoopkim.bsky.social · 12/05/2026
Ah. But this feels like cheating. I guess overfull hboxes should not be warnings in the first place though
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Sun Woo Kim @sunwoopkim.bsky.social · 12/05/2026
damn this never happened to me, I always at least an overflowing \hbox...
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Sun Woo Kim @sunwoopkim.bsky.social · 11/05/2026
Happy to finally have this work from a year ago with Curt von Keyserlingk and @austen.uk published on PRR! In this work, we linked and generalised error correction / inference / learnability problems to quantum and non-optimal regimes, and studied their phases. journals.aps.org/prresearch/a...
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Sun Woo Kim @sunwoopkim.bsky.social · 08/05/2026
self-organisation on a graph with no spatial structures
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Sun Woo Kim @sunwoopkim.bsky.social · 03/05/2026
they need to make a pokemon out of this
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Sun Woo Kim @sunwoopkim.bsky.social · 03/05/2026
so it's a hyundai?
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Sun Woo Kim @sunwoopkim.bsky.social · 03/05/2026
what does quasipolynomial time mean?
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Sun Woo Kim @sunwoopkim.bsky.social · 02/05/2026
Yes, but my point is that a lot of SFT is rigorous (Fokker-Planck)
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Sun Woo Kim @sunwoopkim.bsky.social · 02/05/2026
Isn't analytic continuation / Wick rotation non-rigorous?
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Sun Woo Kim @sunwoopkim.bsky.social · 02/05/2026
Yeah I know, of course you can do Wick rotation, etc., but that's non-rigorous right. For SFT I think you can often do it rigorously with Feynmann-Kac and Fokker-Planck, I think.
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Sun Woo Kim @sunwoopkim.bsky.social · 02/05/2026
Howtown doesn't get enough love. I enjoyed the latest episode, especially the bit about rats on cocaine enjoying jazz: youtu.be/0ZYhyewNQMo&...
youtu.be
What do other animals think of human music?
YouTube video by Howtown
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