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Earl Campbell

@quantumearl.bsky.social

760 followers 200 following 210 posts

Arch mage of quantumancy @ riverlane / Prof @ Sheffield uni / quantum error correction and algorithms / poster of posts / reader of sci-fi / player of games / father of daughters / cronic typer of typoes & requester of edit buttons

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Earl Campbell @quantumearl.bsky.social · May 16

You say Tera, I say Mega!

Riverlane @riverlane.com · May 16

✨What would you do with a MegaQuOp?✨

🧙‍♂️A new #arXiv paper from @ucl.ac.uk & our @quantumearl.bsky.social introduces the ultimate magic trick "Mitigated Magic Dilution" to unlock Clifford circuits with limited qubit numbers: arxiv.org/abs/2505.10513

TL;DR: www.riverlane.com/news/a-magic... #QEC 🧪

Earl Campbell @quantumearl.bsky.social · Jul 22

38 points to my daughter!

Congrats on a great word.

Earl Campbell @quantumearl.bsky.social · Jun 17

So deep, it took me a while to realise it was human:

youtube.com/watch?v=DRwJ...

I sing with my father - Take Me Back To Eden @Sleep-Token wait for the low note #fatherdaughter

YouTube video by Marie-Celestine

youtube.com

Earl Campbell @quantumearl.bsky.social · Jun 4

I was expecting "expert prediction" to be a third-party authority, and found that framing to be weird.

Earl Campbell @quantumearl.bsky.social · Jun 4

I remember seeing project outlines in 2005-2008 saying things like, we will have a fault-tolerant million qubit device in 3 years. If anything, roadmaps have gotten better (more accurate/realistic) since then.

Earl Campbell @quantumearl.bsky.social · Jun 4

Roadmaps! Useful guides for the wider community, or overly simplistic and prone to exaggeration (sometimes, but not always!) ?

thequantuminsider.com/2025/05/16/q...

I ask because we are reviewing our roadmap:
www.riverlane.com/press-releas...

What would you like to know, or do you ignore these?

Quantum Computing Roadmaps: A Look at The Maps And Predictions of Major Quantum Players

As of early 2025, major players are shaping the future with detailed roadmaps and predictions from their expert.

thequantuminsider.com

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Earl Campbell @quantumearl.bsky.social · Jun 3

Mama etna has calmed down in time for our flight home to be undisturbed.

Surreal to see videos of scary fast pyroclastic flows only a few days after we had a tour up there! (Check the news if you don’t know what I am talking about)

Earl Campbell @quantumearl.bsky.social · May 27

Family holiday. At a loss to name this mythical creature, maybe it is the long forgotten mercentaur! It looks functional for neither sea nor land.

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Earl Campbell @quantumearl.bsky.social · May 26

His star role in “the divincenzo code” including incredible evil scientist dance moves

youtube.com/clip/Ugkxaxa...

YouTube

Share your videos with friends, family, and the world

youtube.com

Earl Campbell @quantumearl.bsky.social · May 26

Quantum news: Prof Walmsley returns to Oxford to lead Oxford Quantum Institute

www.physics.ox.ac.uk/news/profess...

Well deserved, alas the bio in the article misses out one of his most notable career moments, ….

Professor Ian Walmsley to lead Oxford Quantum Institute

Professor Ian Walmsley CBE FRS has been appointed Director of the Oxford Quantum Institute at Oxford University.

www.physics.ox.ac.uk

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Earl Campbell @quantumearl.bsky.social · May 24

We have an open rolling advert for QEC researchers at Riverlane. And now also have a single post to fill for an (error-corrected) algorithms researcher

apply.workable.com/riverlane/j/...

Quantum Algorithms Researcher - Riverlane

Cambridge, UK | Full-time or Part-time | Permanent | HybridSalary: £55,000 to £80,000 DOEThe salary range for this role is broad as we are able to consider varying levels of experience.  Any offe...

apply.workable.com

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Reposted by Earl Campbell

Craig Gidney @craiggidney.bsky.social · May 23

I'm often asked if I'll redo the 2019 quantum factoring estimate. Denser storage by yokes, smaller magic factories by cultivation, slimmer approx arithmetic by Chevignard et al… surely the cost is lower now?

Yes, it's lower now.

security.googleblog.com/2025/05/trac...

arxiv.org/abs/2505.15917

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Earl Campbell @quantumearl.bsky.social · May 21

Google quantum symposium is fantastic. But many of the results presented are not on the arXiv yet, and we’ve been asked to not post about them on social media. So, sorry, no live update folks. But I can say cool stuff is coming!

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Earl Campbell @quantumearl.bsky.social · May 19

When your marketing celebs get old and need name tags to be recognisable. LA highlights.

Earl Campbell @quantumearl.bsky.social · May 19

Death by surface code!

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Earl Campbell @quantumearl.bsky.social · May 19

Nice catalog of talks here.

Dom Williamson @domwilliamson.bsky.social · May 19

Talks from the recent YITP workshop “Logical Gates for Encoded Qubits” are up! Thanks again to the organizers for putting on a fantastic workshop. My talk about fault-tolerant logical measurement: www.youtube.com/watch?v=k0G0...

Dominic Williamson - Low-overhead fault-tolerant quantum computation by gauging logical operators

YouTube video by YITP Quantum Error Correction Workshop

www.youtube.com

Earl Campbell @quantumearl.bsky.social · May 18

Jet lagged and adjusting

Earl Campbell @quantumearl.bsky.social · May 18

I highly recommend this paper.

[EPIC POST-PLANE POST FINISHED]

Earl Campbell @quantumearl.bsky.social · May 18

There are also a bunch of other tricks in there like optimization of electron orbital basis to minimize a crucial parameter Lambda, also clearly a smart thing to do. Of course, the devil is in the details, and the work is brilliantly executed.

Earl Campbell @quantumearl.bsky.social · May 18

What is the main contribution of Gunther et al? They explore the more LCU based approach (leaving behind diamond norms) while also using a “best of both worlds” approach. This is clearly the right thing to do and was a combination that I never got to exploring.

Earl Campbell @quantumearl.bsky.social · May 18

Gunther does a fantastic job of reviewing these connections and is a far better intro to the subject than any other that I have read so far.

Earl Campbell @quantumearl.bsky.social · May 18

So it was lovely to read Gunther et al and return to the topic. Firstly, there are a bunch of connections, especially between my papers 1 and 3 above, which have never been very well explained the literature.

Earl Campbell @quantumearl.bsky.social · May 18

And over the years, I have been excited to see lots of papers and conference posters on randomized approaches, from people including Eisert, Weibe, Guzik, and others. I read some of these, but many are still in que (for another plane journey!) and I am sure I missed some gems.

Earl Campbell @quantumearl.bsky.social · May 18

After [1,2,3] I disconnected from this research area a bit. Despite having a list of ideas on what to do next, I switched over to being more focused on QEC.

Earl Campbell @quantumearl.bsky.social · May 18

And after a tour de force of Mathematics from Kianna, we had want I considered a very beautiful result with improved resource estimates. Though the resource estimates were still not competitive except under some extreme assumptions discussed there.

Earl Campbell @quantumearl.bsky.social · May 18

3 - Later, while at AWS with Kianna Wan and Mario Berta, we realized that for phase estimation problem we only need an LCU decomposition of some target unitary.