Wat? Sort of answers what was original motivation for iswap, at least for me, is iswap better for some code? Did not expect the color code to be the answer!

Portlanders — show off your corner of war-ravaged Portland below.

Gauging versus dualities: equivalent up to constant depth quantum circuits. arxiv.org/abs/2509.22051

Today at IAS, I gave a 2 hr 15 mins lecture on why TIME[t] is in SPACE[√(t log t)]. You can watch it here! www.youtube.com/watch?v=ThLv...

One danger of modern social media is that crazy posts, bot posts, and real posts all look professional due to formatting. I call it the myspace vs facebook divide or the difference between a zine and a pamphlet. Now I find this non-crazy zine on social media and may need to rework my analogies.

(Love you all my suited quantum friends, just loosen up the dress code and join the revolution)

I used to have a “ctrl-c ctrl-z is the greatest invention” sign. How many times do you copy and paste every day?

Larry Tesler, inventor of the cut, copy, and paste commands, dies at 74

The starting point of our formalism is the subsystem spacetime code construction of Bacon et al. (arxiv.org/abs/1411.3334). To any Clifford circuit, you can associate a subsystem code that encapsulates its QEC properties, e.g. the distance of the code is exactly the fault distance of the circuit.

New paper out ✨ Fault-tolerant Transformation of Spacetime Codes, a collaboration w/ @vasmer.bsky.social, Austin Daniel & Ilan Tzitrin, which started during my internship @xanaduai.bsky.social scirate.com/arxiv/2509.0... Let's now see if I can summarize 101 pages (🙈) in a few tweets (and memes!)

In cellular automata, simple rules create elaborate structures. Now researchers are working backward — starting with the result to learn the rules behind it. @georgemusser.com, SFI’s 2025 Journalism Fellow, explores how this could reshape computation and self-organization in Quanta:

TodePond in case you don’t known youtu.be/ZMklf0vUl18?...

Speculative but intriguing proposal for a neutrino laser using superradiant ν emission from a Bose-Einstein condensate of radioactive ⁸³Rb PRL: go.aps.org/3KaIvg4 #OpenAccess PhysMag: go.aps.org/3V6Sp4U

Variational quantum hype

U of T is thrilled to celebrate the Year of Quantum by advertising three new faculty positions! Please spread the word, encourage friends/mentees to apply, or consider applying yourself. (Links in rest of thread) #QuantumOptics #QuantumInformation #AMO @cqiqc-uoft.bsky.social

When was the first time someone wrote down the circuit identity that conjugating Hadamard gates around a controlled-not flips the direction of the controlled-not? The earliest I have found is Gottesman 1998, arxiv.org/abs/quant-ph... It also appears as an exercise in Mike and Ike published in 2000.

This boat regularly parks in front of my house, silently taunting me.

Fron arxiv.org/abs/quant-ph... "Proof chickens". I'll leave it to you to follow the link.

Hey! You! Get off bsky and get bored. youtu.be/orQKfIXMiA8?...

For programming langhage nerds verdagon.dev/blog/group-b...

It’s (almost) RNAs world, we just live in it.

Bad Policy: Subjecting PhD students and postdocs to 4-year visa limits, subject to immigration officials' review. This bureaucratic overregulation will reduce US competitiveness and weaken US science. There needs to be more awareness and discussion of this terrible idea news.bgov.com/daily-labor-...

I wrote an op-ed on the world-class STEM research ecosystem in the United States, and how this ecosystem is now under attack on multiple fronts by the current administration: newsletter.ofthebrave.org/p/im-an-awar...

In closing of #qec2025, we have put up our 1000th code -- the [[8,3,2]] surface code on a cube (aka the Landahl plucky code)! It is a non-CSS code different from the smallest interesting color code. Stabilizer generators are X, Y, or Z strings on the faces. errorcorrectionzoo.org/c/cubic_surf...

It’s what friends do. Hey Ken about that defining FT paper…

"Every American taxpayer is a silent shareholder in that success. If we walk away now, we lose not just future breakthroughs but also what we have already earned." thehill.com/opinion/tech...

Nominate the most innovative work on Fundamental Issues in Quantum Mechanics and their Applications for the 2026 John Stewart Bell Prize! (Pls rebleep!) See cqiqc.physics.utoronto.ca/bell-prize/n... Deadline 30 August 2025. #QuantumInformation #FoundationsOfQM #BellPrize #QuantumPhysics

Very exciting announcement, the next Quantum Error Correction conference QEC26 will be hosted by Google 7-12 June 2026 in Santa Barbara. See you there! @dripto.bsky.social @mattmcewen.bsky.social

If you saw my talk yesterday at QEC, this paper is the one that allows us to further improve distance of the mid cycle states further!

I mean, it's nice to have a Wikipedia page. Even nicer to have a Wikipedia page devoted to something named after you. But it's hard to beat a Wikipedia page devoted to simply *listing* things that are named after you. en.wikipedia.org/wiki/List_of...

Research or Beatles song? LUCI in the hex with dropout🎶🎶🎶

Looks like 3-coupler / hex implementation of the surface code can now tolerate dropout! www.arxiv.org/abs/2508.08116

Check out pianqtn.com by @balintpato.bsky.social . It is a graphical toolbox for building and evaluating quantum error correction codes following the quantum Lego approach of Cao and Lackey arxiv.org/abs/2109.08158 Balint also made a YouTube tutorial youtu.be/TNnE3hReYVk?...

Mary Wootters is a computer scientist at Stanford. She also created a kids book and a board game. On this week’s episode of "The Joy of Why," we discuss how playfulness can be an essential tool for scientific discovery. www.quantamagazine.org/how-can-math...

The QIP 2026 call for papers is out! QIP 2026 will be held in Riga, Latvia from January 24–30, 2026. See you there! qip2026.lu.lv

Much Madness is divinest Sense - To a discerning Eye - Much Sense - the starkest Madness - ’Tis the Majority In this, as all, prevail - Assent - and you are sane - Demur - you’re straightway dangerous - And handled with a Chain - —Emily Dickinson

Potayto, Potahto Tomayto, Tomahto

It looks to me like the Sumerians knew the zx-calculus archaeology.org/news/2025/07...

I always like to be in the low percentiles, happy to see that there are less than 1% who give the obviously correct answer, retrocausality :)

Mumble mumble years ago I took two courses taught by Shuki Bruck at Caltech. I wasn’t great at attending classes, but he was such an amazing teacher that I attended every one of his classes. Watching the clips here reminded me of the joy with which he taught youtu.be/WEVZAgNZehA?...

Applications are open for SFI's 2026 Complexity Postdoctoral Fellowships If you’ve recently earned a Ph.D. in any scientific field and want to pursue independent, transdisciplinary research, consider applying. Deadline: October 1, 2025 Apply here: santafe.edu/sfifellowship

When I was at QCPR, there was a retirement symposium for David DiVincenzo www.quantuminfo.physik.rwth-aachen.de/cms/~bmmwed The line up looks great.

#Quantum #QIP2025 The team @qip2025.bsky.social has uploaded the QIPv2025 talks www.youtube.com/@QIP2025 Enjoy rewatching your favorites!

RIP Ozzie youtu.be/NKqHLO6FM-Q?... youtu.be/8lD5bfqzr6E?... “Crazy, but that's how it goes Millions of people living as foes Maybe it's not too late To learn how to love and forget how to hate”

Always one of my top recommendations if you have extra hours in the area.

Still proud of the time Minsky lit into me on the Usenet for asking a question about whether barchans are alive

Hirahara, Illango, and Loff posted on the arXiv a lovely result, showing that determining the communication complexity of a function f is NP-hard. A fundamental question first asked by Yao in '79. The proof is very clean and elegant. A fun read for the weekend! arxiv.org/pdf/2507.104...

Had forgotten that it was an engineer in Hamlet who hoisted his own petard “For 'tis the sport to have the enginer Hoist with his own petard” -Hamlet Seems like tech bros have been at this game for a long time (to be fair, this old use of enginer meant someone more like a bombmaker)

“Go to the edge of quantum physics with GPT” and start free-associating without doing the math or proposing experiments, you’re not doing physics; you’re generating science-fiction brainstorming. That can be fun, but until someone does the hard yards, it lives in the “vibe sci-fi” bucket.