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Earl Campbell

@quantumearl.bsky.social
828 followers 212 following 219 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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Reposted by Earl Campbell
Nick Blunt @nickblunt.bsky.social · 05/05/2026
In a new paper with @abaysmidt.bsky.social and @nqcp-nbi.bsky.social, we propose quantum simulation of nanographenes as an application to bridge early and later fault-tolerant quantum computing and study Trotter errors. scirate.com/arxiv/2605.0...
scirate.com
Quantum simulation of nanographenes and Trotter error cancellation
Fault-tolerant quantum computing is a promising tool for simulating molecules and materials, but frequently-considered applications require substantial resources, and the gap between hardware capabili...
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Reposted by Earl Campbell
Riverlane @riverlane.com · 30/01/2026
🎉 It's publication day! 🎉 Congrats to the team for a new @prxquantum.bsky.social paper where their 'ghost protocol' speeds up QEC cycle speeds 10x for AMO qubits 👻 journals.aps.org/prxquantum/a... 👏 Mark Turner, @quantumearl.bsky.social, Ophelia Crawford, Neil Gillespie, and Joan Camps
journals.aps.org
Scalable Decoding Protocols for Fast Transversal Logic in the Surface Code
A scalable decoding protocol enables fast logic with AMO qubits.
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Reposted by Earl Campbell
Dripto Debroy @dripto.bsky.social · 27/02/2026
Registration is now open for QEC26, to be held this June in sunny Santa Barbara, CA! See the registration page at qec-conference.org for a link. Also, the deadline for submissions is next Friday. Make sure to get those in and spread the word to friends and collaborators!
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Earl Campbell @quantumearl.bsky.social · 07/11/2025
Come on quantum MUB folks. Don’t make me post on X. What’s the verdict?
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Earl Campbell @quantumearl.bsky.social · 06/11/2025
Can the experts weight in if MUBS is solved now? scirate.com/arxiv/2511.0... @sflammia.bsky.social ?
scirate.com
Mutually Unbiased Bases and Orthogonal Latin Squares
In this paper, we prove that the existence of a complete set of mutually unbiased bases (MUBs) in N-dimensional Hilbert space implies the existence of a complete set of mutually orthogonal Latin squar...
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Earl Campbell @quantumearl.bsky.social · 06/11/2025
Can the experts weight in if MUBs are solved now? scirate.com/arxiv/2511.0...
scirate.com
Mutually Unbiased Bases and Orthogonal Latin Squares
In this paper, we prove that the existence of a complete set of mutually unbiased bases (MUBs) in N-dimensional Hilbert space implies the existence of a complete set of mutually orthogonal Latin squar...
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Earl Campbell @quantumearl.bsky.social · 15/10/2025
Bids from anywhere are welcome. And the last Europe QEC was a long time ago, so that bodes well for a strong European bid. But after this year, I've done my turn of QEC organising/steering, and so someone else in Cambridge (not me) will have to bid.
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Earl Campbell @quantumearl.bsky.social · 15/10/2025
I also posted this on X and for the first time got more reposted here than on X! I try not to use X but this seemed too important to limit to the bluesky bubble, but maybe X is actually the smaller bubble now.
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Earl Campbell @quantumearl.bsky.social · 15/10/2025
Coming out of social media hibernation to ask: Are you interested in hosting a future QEC conf? We are looking for detailed bids for QEC27 over the next month (provisional deadline 21st November). For more info: DM or email me. QEC26 will be in Santa Barbara
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Earl Campbell @quantumearl.bsky.social · 22/07/2025
38 points to my daughter! Congrats on a great word.
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Earl Campbell @quantumearl.bsky.social · 17/06/2025
So deep, it took me a while to realise it was human: youtube.com/watch?v=DRwJ...
youtube.com
I sing with my father - Take Me Back To Eden @Sleep-Token wait for the low note #fatherdaughter
YouTube video by Marie-Celestine
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Earl Campbell @quantumearl.bsky.social · 04/06/2025
I was expecting "expert prediction" to be a third-party authority, and found that framing to be weird.
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Earl Campbell @quantumearl.bsky.social · 04/06/2025
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.
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Earl Campbell @quantumearl.bsky.social · 04/06/2025
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?
thequantuminsider.com
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.
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Earl Campbell @quantumearl.bsky.social · 03/06/2025
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)
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Earl Campbell @quantumearl.bsky.social · 27/05/2025
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 · 26/05/2025
His star role in “the divincenzo code” including incredible evil scientist dance moves youtube.com/clip/Ugkxaxa...
youtube.com
YouTube
Share your videos with friends, family, and the world
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Earl Campbell @quantumearl.bsky.social · 26/05/2025
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, ….
physics.ox.ac.uk
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.
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Earl Campbell @quantumearl.bsky.social · 24/05/2025
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/...
apply.workable.com
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...
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Reposted by Earl Campbell
Craig Gidney @craiggidney.bsky.social · 23/05/2025
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 · 21/05/2025
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 · 19/05/2025
When your marketing celebs get old and need name tags to be recognisable. LA highlights.
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Earl Campbell @quantumearl.bsky.social · 19/05/2025
Death by surface code!
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Earl Campbell @quantumearl.bsky.social · 19/05/2025
Nice catalog of talks here.
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Earl Campbell @quantumearl.bsky.social · 19/05/2025
Jet lagged and adjusting
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
I highly recommend this paper. [EPIC POST-PLANE POST FINISHED]
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
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.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
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.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
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.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
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.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
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.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
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.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
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.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
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.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
But crucially, we were still stuck in terms of diamond norm analysis, and getting away from this mindset would prove to be crucial to really cracking the problem.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
2 - It was clear even then to me, that qdrift was suboptimal and that some kind of hybrid deterministic and randomized method would allow a “best of both” approach. At Sheffield, with Yingkai and David, we made some progress with the SparSto protocol.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
Errors were measured with respect to the diamond norm.  In the appendices, I attempted a resource analysis of phase estimation, but I was lacking the tools / knowledge of the literature, and It wasn’t great!
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
This showed that quantum simulation (and phase estimation) were possible with a gate count independent of the number of terms in the Hamiltonian, but with worse scaling w.r.t other parameters.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
 1 - I came up with the qdrift algorithm I fondly remember working on it in the evening after my young kids had gone to bed, keen to finish the work as I knew it was special.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
I am going to put this in context by giving a self indulgent recap of 3 of my related works, numbered 1,2,3...
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
While the total resource count over all shots is still higher than for qubitization based approaches, far fewer logical qubits are needed and the gates per circuit are competitive.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
This was a pleasure to read for me as it picked off from where I left my thinking on randomized approaches, ultimately leading to some decent resource estimates for this approach applied to hydrogen chains and FeMoco.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
I love catching up on my “to read” list of papers on planes.  And today found time to read some recent work on randomized phase estimation arxiv.org/abs/2503.05647 from Gunther et al
arxiv.org
Phase estimation with partially randomized time evolution
Quantum phase estimation combined with Hamiltonian simulation is the most promising algorithmic framework to computing ground state energies on quantum computers. Its main computational overhead deriv...
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
Arrived in LA. Stuck in traffic on way to hotel, of course. Good flights. Read some papers with a longer update coming soon. Movie: the Dracula remake. Very much liked. Only seen bits of the original but could tell there were a lot of references. Very dark and gritty. 5 stars.
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Earl Campbell @quantumearl.bsky.social · 18/05/2025
LA here I come! Boarding flight now to head to speak at the Google summer symposium. Followed by a short visit to our Boston office.
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Earl Campbell @quantumearl.bsky.social · 16/05/2025
You say Tera, I say Mega!
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Earl Campbell @quantumearl.bsky.social · 16/05/2025
www.riverlane.com/team/steve-b...
riverlane.com
Steve Brierley - Riverlane | CEO & Founder
Steve Brierley has 20+ years experience in quantum and founded Riverlane in 2016 to build the error correction stack for quantum computers.
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Earl Campbell @quantumearl.bsky.social · 15/05/2025
@jenseisert.bsky.social
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Earl Campbell @quantumearl.bsky.social · 15/05/2025
Office slack chat …
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Earl Campbell @quantumearl.bsky.social · 13/05/2025
Many sightings of people not following official dress code. Joel of Phasecraft looking especially casual and brightly coloured. 😎
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