Earl Campbell

scirate.comQuantum simulation of nanographenes and Trotter error cancellationFault-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...

16 May 2025

You say Tera, I say Mega!

Riverlane@riverlane.com

✨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 reposted

Nick Blunt

@nickblunt.bsky.social

5 May

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...

Earl Campbell reposted

Riverlane

@riverlane.com

30 Jan

🎉 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.orgScalable Decoding Protocols for Fast Transversal Logic in the Surface CodeA scalable decoding protocol enables fast logic with AMO qubits.

Riverlane@riverlane.com

👻 We ain’t afraid of no ghost! A new #arXiv paper from our team proposes the 'ghost protocol’ to enable AMO qubits to catch up with superconducting qubits, which lag in #QEC cycle speeds. It addresses the challenges of scalable #QuantumErrorCorrection in the context of fast transversal logic👇🧪

Earl Campbell reposted

Dripto Debroy

@dripto.bsky.social

27 Feb

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!

scirate.comMutually Unbiased Bases and Orthogonal Latin SquaresIn 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...

7 Nov 2025

Come on quantum MUB folks. Don’t make me post on X. What’s the verdict?

Earl Campbell@quantumearl.bsky.social

Can the experts weight in if MUBS is solved now? scirate.com/arxiv/2511.0... @sflammia.bsky.social ?

6 Nov 2025

Can the experts weight in if MUBS is solved now? scirate.com/arxiv/2511.0... @sflammia.bsky.social ?

6 Nov 2025

Can the experts weight in if MUBs are solved now? scirate.com/arxiv/2511.0...

15 Oct 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

15 Oct 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.

22 July 2025

38 points to my daughter! Congrats on a great word.

youtube.comI sing with my father - Take Me Back To Eden @Sleep-Token wait for the low note #fatherdaughterYouTube video by Marie-Celestine

17 June 2025

So deep, it took me a while to realise it was human: youtube.com/watch?v=DRwJ...

thequantuminsider.comQuantum Computing Roadmaps: A Look at The Maps And Predictions of Major Quantum PlayersAs of early 2025, major players are shaping the future with detailed roadmaps and predictions from their expert.

4 June 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?

3 June 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)

27 May 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.

physics.ox.ac.ukProfessor Ian Walmsley to lead Oxford Quantum InstituteProfessor Ian Walmsley CBE FRS has been appointed Director of the Oxford Quantum Institute at Oxford University.

26 May 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, ….

youtube.comYouTubeShare your videos with friends, family, and the world

26 May 2025

His star role in “the divincenzo code” including incredible evil scientist dance moves youtube.com/clip/Ugkxaxa...

apply.workable.comQuantum Algorithms Researcher - RiverlaneCambridge, 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...

24 May 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/...

Earl Campbell reposted

Craig Gidney

@craiggidney.bsky.social

23 May 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

21 May 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!

19 May 2025

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

19 May 2025

Death by surface code!

youtube.comDominic Williamson - Low-overhead fault-tolerant quantum computation by gauging logical operatorsYouTube video by YITP Quantum Error Correction Workshop

19 May 2025

Nice catalog of talks here.

Dom Williamson@domwilliamson.bsky.social

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...

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.

Jet lagged and adjusting

arxiv.orgPhase estimation with partially randomized time evolutionQuantum 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...

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

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.

I highly recommend this paper. [EPIC POST-PLANE POST FINISHED]

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

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.

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.

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

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.

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.

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

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.

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.

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

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.

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.

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

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!

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.

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

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.

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.

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

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.

I am going to put this in context by giving a self indulgent recap of 3 of my related works, numbered 1,2,3...

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

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.

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.

15 May 2025

Office slack chat …

15 May 2025

@jenseisert.bsky.social