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🚀 Super excited to launch PlanqTN — an open-source Python lib + interactive web app for exploring quantum LEGO-based QEC codes!
🎥 Intro video: youtu.be/TNnE3hReYVk
🔗 GitHub: github.com/planqtn/plan...
🌐 Studio: planqtn.com
Handy for controlled gates and diagonal non-Clifford stuff
Add another regular Hadamard to the three legged one to get an AND gate on computational basis states:
In general it's this bunch of symbols:
Yeah I'm mostly joking, I agree with providing circuit diagrams - but if you're having to make up new notation anyway...
Hadamard box is "all ones matrix except for the bottom corner", e.g.:
Or we could all use the ZX-calculus!
Cinema-goers agree that the proof technique is unsatisfying:
From Aluffi's 'Algebra: Chapter 0'.
New proof technique unlocked:
Section 3 of the Extractor paper is a very good overview I find as a non-expert. arxiv.org/abs/2503.10390
Footnote from a paper: "Not to be confused with 'copy cat' or 'coffee cup'"
More fun footnotes in papers please! On 'copy cup' gates (scirate.com/arxiv/2410.1...):
I recently read Schönhauser Allee by Wladimir Kaminer. It's a bunch of funny little vignettes (modulo your definition of funny) of life in Berlin. Each one is 5 or so pages long, simple language, and there's no real plot to remember. I recommend it!
News to me - this must be a rival to QCTiP in the similar but unrelated field of quanthm info?
Submissions for QCTiP 2025 are now open.
Anyone want to collaborate on making a @typst.app template for @quantum-journal.org?
From "Introducing String Diagrams: The Art of Category Theory" - helluva book.
'We have already conducted the proofs for the shapes in the first row, using two pops for the doughnuts and two snaps for the hourglasses. For the ears, we combine a snap with a pop...'
Noice bit of whimsy from Hinze and Marsden: 'In addition to the ear, we meet two old acquaintances, the doughnut and the hourglass... and we get to know a new one, the “spiral.” All of them share the fate of the ears in that they collapse to the identity.'
Me neither! I'm just curious to know who else is on the team atm. Have added you to the list.
Link to list: bsky.app/profile/did:...
In any case, if you're reading this as a memory-systems-for-research user and want to be added, reply below!
...perhaps there's already such a list/starter pack and I couldn't find it, or an online community already hanging out somewhere?
For now I've just added a couple of friends from my research group who I hope won't mind being added. Feels impolite to add others against their will, but perhaps one of the GOATs @michaelnielsen.bsky.social or @andymatuschak.org would be interested in promoting this list (and being on it!). Or...
In the spirit of trying to use this thing properly, rather than just lurking like I did on TwiXer, a community I'd like to be more plugged into is people using memory systems for research (Anki, Mochi, etc, but for more than language learning or memorising capital cities). So I've made a list.
Alternatively: the ZX-calculus representation is the best way of depicting surface codes (arxiv.org/abs/2204.14038)
