Sun Woo Kim

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)

Man I looked at ONE picture of a mushroom and now my entire feed is #shroomscrolling

Constant number of submissions to arxiv every month

Hope your day was better than Darwin’s, on this day 165 years ago

Thank god: 2 submissions per month limit on arXiv. blog.arxiv.org/2026/10/01/u...

Joan Birman is amazing! www.nytimes.com/2026/09/06/s...

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?

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...

she's so real for that

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!

'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

'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 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)

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...

they need to make a pokemon out of this

Howtown doesn't get enough love. I enjoyed the latest episode, especially the bit about rats on cocaine enjoying jazz: youtu.be/0ZYhyewNQMo&...

coming from windows? life pro tip! create a puzzling '3D Objects' folder on your OS of choice to make it feel more familiar

I have to say, publishing results as zero knowledge proof does have one benefit: it tricks security researchers into learning about quantum circuits. This is some amazing work! https://blog.trailofbits.com/2026/04/17/we-beat-googles-zero-knowledge-proof-of-quantum-cryptanalysis/

Tailor Bird sews leaves together with plant fibre to form its nest!

Actually, I think there are infinite, but are all variations of that 7 hex case with a fully connected middle tile. Removing that, not convinced a non-trivial solution configuration exists (eg. swapping a straight line 180 degrees). Would love to be proven wrong! Here's a 9 hex case I found.

I wonder if it's easy or hard to find configurations with multiple allowed solutions

For some reason I thought the left was a giant apple

From a pen & paper theorist point of view, I find it much harder to fall into the trap described here, since I find that it *is* the point to understand every detail of the proof (as you say). In contrast, for coding, often I just want a function without understanding every detail and I start vibing

UK greenhouse gas emissions are now down 54% since 1990. They fell 2% last year. It's something the country doesn't boast about enough. Yes, some of it is switch from industry to services. But the biggest reductions are from changes to electricity supply. 👇 www.gov.uk/government/s...

don't forget sepia mode

what got me was modelling the observer's death with a replacement channel to the global thermal state ρ(β) scirate.com/arxiv/2603.2...

If you have agents who are perfect Bayesians, surely they have a prior and posterior modelling the other agents. But then they have to model that they have a prior and posterior etc... how does one stop the infinite recursion?

Have you heard the story of Barkley’s good friend Lin, a Chinese immigrant scientist in Iowa? www.wbur.org/onlyagame/20...

If you have agents who are perfect Bayesians, surely they have a prior and posterior modelling the other agents. But then they have to model that they have a prior and posterior etc... how does one stop the infinite recursion?

it’s on jooble dude just log in to bebee

whatever man Sure let me login with wetdry world who gives a shit

now that's an exponential

Hot take: distributions with infinite variance don't really exist in real life. Everything has a cutoff due to system size. Of course, if the system size grows, then the cutoff grows. So in my opinion distributions with infinite variance are really describing a limit.

Game of Life

In somebody else's words:

Is measuring syndromes then using a decoder to infer the most likely error the best thing to do when trying to do quantum error correction? I prove cases where it is, where it isn't, and how to find the optimal threshold. Happy to get this out: let me know what you think! scirate.com/arxiv/2603.0...

Hey look it's good news

In 1874, Georg Cantor published one of the most important papers in math’s 4,000-year history. The ideas in it were stolen. 🧵

Yeah but really just two sizes right