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Ross Duncan

@rossquantum

Quantum computing lifer. ZX-calculus co-inventor. Quantum compiler compiler and quantum programmer programmer. String diagrammer. Category theoriser. Senior Fellow @ Quantinuum (I cannot read DMs on Bluesky)

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08.03.2024
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Latest posts by Ross Duncan @rossquantum

Preview
Fault-tolerant execution of error-corrected quantum algorithms Scaling up quantum algorithms to tackle high-impact problems in science and industry requires quantum error correction and fault tolerance. While progress has been made in experimentally realizing err...

From my brilliant colleagues: Fault-tolerant demonstrations of QAOA and HHL. This actually came out last week, but I failed to post about it!
#quantum #quantumcomputing #quantinuum #ftqc #qec
arxiv.org/abs/2603.04584

09.03.2026 09:58 πŸ‘ 5 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Still the best book on the subject.
</hasn't read a technical book in years>

06.03.2026 04:16 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Serious question : how do you gain confidence that numbers produced are right?

I have shot myself in the foot many times with numerical experiments (when *I* wrote the code) with stupid mistakes producing plausible but wrong answers.

06.03.2026 01:27 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Lecturer in Mathematically Structured Programming (790646) at University of Strathclyde Apply for the Lecturer in Mathematically Structured Programming (790646) role on jobs.ac.uk, the top job board for academic positions in higher education. View details and apply now.

The firm of which I am the Dowager Duchess is hiring! We want lively brains for new explains and well taught wains. www.jobs.ac.uk/job/DQS044/l...

04.03.2026 20:46 πŸ‘ 3 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

2026 : The year of Linux on the Desktop.

04.03.2026 17:17 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

If you are interested in working in the intersection of QEC and software check out our job posting for a position at Quantinuum: jobs.eu.lever.co/quantinuum/b...

Areas of research include QEC software development, logical noise modeling, resource estimation, QEC/Hardware co-design, and more.

03.03.2026 17:46 πŸ‘ 14 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
A Day in the Life of an Ensh*ttificator
A Day in the Life of an Ensh*ttificator YouTube video by ForbrukerrΓ₯det - Norwegian Consumer Council

Absolutely love this!
www.youtube.com/watch?v=T4Up...

Kudos to the Norwegian Consumer Council for their efforts to fight enshittification!
www.forbrukerradet.no/news-in-engl...
Read their report here:
storage02.forbrukerradet.no/media/2026/0...

02.03.2026 11:16 πŸ‘ 19 πŸ” 9 πŸ’¬ 1 πŸ“Œ 1

In other news, Magit + Forge is a really great for interacting with Github in #emacs. Just don't believe what Google says about it.

02.03.2026 08:14 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Google AI Overview:
> The Magit forge package does not currently provide a native
> interface for .... <thing I want to do>
> --> some link.

Further down the linked thread, the feature has existed since 2023. Never mind "general intelligence", this is not even competent information retrieval. 😑

02.03.2026 08:13 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Nothing is perfect, but Quantum gets so many things right that it is painful to consider submitting work to other venues.

01.03.2026 01:56 πŸ‘ 8 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

I'd vote for that ticket.

27.02.2026 14:20 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
Computing with many encoded logical qubits beyond break-even High-rate quantum error correcting (QEC) codes encode many logical qubits in a given number of physical qubits, making them promising candidates for quantum computation. Implementing high-rate codes a...

arxiv.org/abs/2602.22211
#quantum #qec #quantinuum

26.02.2026 23:24 πŸ‘ 20 πŸ” 4 πŸ’¬ 0 πŸ“Œ 1
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Actually, the left is winning the AI debate But it does need to get organized.

"Rejecting or resisting a commercial technology designed to attempt a mass wealth transfer and to erode public institutions is a valid political position."

www.bloodinthemachine.com/p/actually-t...

26.02.2026 15:33 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Personally I try to keep it simple : "Good question! I don't know the answer."

23.02.2026 20:41 πŸ‘ 5 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

10 years after its founding, driven by the energy, enthusiasm, & dedication of the community @quantum-journal.bsky.social quietly published paper #2000 some days ago.

At least I think this is a big deal, big shout out to the founders & all authors, reviewers, editors, board members & contributors!

23.02.2026 08:09 πŸ‘ 44 πŸ” 10 πŸ’¬ 0 πŸ“Œ 2

Excel : clone of the market leader in a popular category
PowerPoint : first program of its kind, also first acquisition by MS.

23.02.2026 01:30 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Tips for giving a great talk | PIRSA Spekkens, R. (2022). Tips for giving a great talk. Perimeter Institute. https://pirsa.org/22100109

After a recommendation many years ago I am finally watching this talk while I struggle with powerpoint: pirsa.org/22100109

22.02.2026 15:23 πŸ‘ 0 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

#bluesky "Discover" feed : 80% people I already follow, 10% pictures of dogs and cats, 10% American business "news" that I block on sight.

Are others getting similar? I remember it wasn't always like this.

19.02.2026 07:04 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Switch to Markdown in Github.

18.02.2026 00:24 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I still have one :-)

17.02.2026 07:26 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Post image

Check out this course, if you want to learn about our quantum pictures!

Link: neurossance.com/courses/quan...

16.02.2026 14:27 πŸ‘ 6 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
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Petition: Require all think tanks to disclose their donors, funding, and media spending Research bodies and representation of specialist interests is important when making policy. However, think tanks go beyond merely brainstorming ideas and presenting data and arguments. They can push s...

Gonna post it again...

Please give it some exposure. It might not result in anything even if it got 100K signatures, but if it doesn't get any it definitely won't and we're seeing more and more evidence rather than conjecture around these murky, opaque orgs.

petition.parliament.uk/petitions/75...

16.02.2026 18:11 πŸ‘ 145 πŸ” 130 πŸ’¬ 9 πŸ“Œ 9
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Stop Palantir taking over our public services! Our public services aren’t for a secretive profit-hungry US tech firm. Sign the petition to tell the Government to scrap all contracts with secretive US tech firm Palantir.

Palantir, a US spy-tech firm, has been given access to millions of NHS patient records.

Its founder has said the NHS should be 'ripped up'.

Join me in calling on the government to end the dangerous Palantir contract.

you.38degrees.org.uk/petitions/st...

13.02.2026 10:26 πŸ‘ 4171 πŸ” 1901 πŸ’¬ 117 πŸ“Œ 87
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Minimising the number of edges in LC-equivalent graph states Hemant Sharma, Kenneth Goodenough, Johannes Borregaard, Filip RozpΔ™dek, and Jonas Helsen, Quantum 10, 2001 (2026). Graph states are a powerful class of entangled states with numerous applications in...

Newly published in Quantum: Minimising the number of edges in LC-equivalent graph states by Hemant Sharma, Kenneth Goodenough, Johannes Borregaard, Filip RozpΔ™dek, and Jonas Helsen doi.org/10.22331/q-2...

10.02.2026 14:30 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Post image

maybe anathem got it right, idk.

17.12.2025 22:33 πŸ‘ 23 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0

Very cool.

05.02.2026 05:12 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

$ tail -1 /etc/hosts
127.0.0.1 www.washingtonpost.com

05.02.2026 05:10 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
talks.cam : Automatically Formally Verified Hardware using Aristotle

I am giving a talk about automatic formal verification of computer hardware using Harmonic's Aristotle system at the University of Cambridge at their CS department on Thursday 26 February 2026 at 2PM in room FW26. The talk is open to the public.
talks.cam.ac.uk/talk/index/2...

29.01.2026 20:00 πŸ‘ 26 πŸ” 6 πŸ’¬ 3 πŸ“Œ 0

want to escape serfdom? time’s running out to start piping your entire workflow through a Clasp stack hosted on a Worgret instance and then sieving that output into LiBit bottles to get churned up into something Fluss can read and tokenize in the cloud with Nonk

29.01.2026 01:10 πŸ‘ 43 πŸ” 11 πŸ’¬ 1 πŸ“Œ 0

Slow Horses is great, miles better than everything else on Apple TV. Also, each season is self contained (because based on a book) so there's no narrative rip off at the end, like pretty much much all other contemporary shows. Caveat given, Severance is good, Silo OK.

29.01.2026 14:00 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0