Earl T Campbell @earltcampbell Twitter profile | Pikagi

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Earl T Campbell

@earltcampbell

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Quantum wizardry // VP of Quantum Science @riverlane_io & opinions are mine // senior lecturer @sheffielduni .

Cambridge

https://t.co/LaZx9RZ9RZ

Joined November 2014

Don't wanna be here? Send us removal request.

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@earltcampbell

Earl T Campbell

3 months

I've been quiet on X lately. But one thing you can always rely on X for is a good place to plug job vacancies. We're hiring! With some big plans ahead (watch this space for news). QEC researchers and a more senior role

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From climate change to healthcare, large and reliable quantum computers will help solve some of the world’s biggest challenges. Riverlane is building the quantum error correction layer to make this...

apply.workable.com

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@earltcampbell

Earl T Campbell

3 years

Our new blog-post, “Designing a fault-tolerant quantum computer based on Schrödinger-cat qubits,” explains the AWS Center for Quantum Computing’s 1st architecture paper

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@earltcampbell

Earl T Campbell

1 month

Earlier this year, at post conference drinks in a bar, a Googler let slip that “everyone is working flat out on a rather special QEC experiment” but shared no more! And so, I’ve been eagerly awaiting a mysterious paper until today!

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@earltcampbell

Earl T Campbell

2 years

Getting a lot of requests from people to DM them and help them get into "quantum". But then their profiles are full of stuff about NFTs & bitcoins. I will not be reply to such requests. For, I hope, obvious reasons.

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@earltcampbell

Earl T Campbell

5 years

Today I did a quick debunk of @skdh 's hatchet job on quantum computation. Get a balanced view here: closes with a hat tip to last week's #QEC19 ;)

@skdh

Sabine Hossenfelder

5 years

Quantum supremacy is coming. It won't change the world

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@earltcampbell

Earl T Campbell

3 years

AWS goes public at QIP on having cats in the lab. Exponential error suppression sustained up to 6 photons.

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@earltcampbell

Earl T Campbell

7 months

And the 2024 prize for best #APSMarchMeeting swag/merch goes to ⁦ @Alice__Bob ⁩

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Earl T Campbell

1 year

My two cents on the twitterati debate of whether qubit quality has not been increasing (fast enough?) because of the focus on qubit count.

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@earltcampbell

Earl T Campbell

11 months

After many years of physicists saying I'm a mathematician, mathematicians saying I'm a computer scientist, and computer scientists saying I'm a physicist,.... we finally have the definitive truth proclaimed by Google.

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@earltcampbell

Earl T Campbell

2 years

How fast do QEC decoders need to be? Most people give a black/white answer (e.g 1us per QEC round for some max distance). But, efficient & scalable QEC is possible even with slow (inner) decoders if you parallelize them! As we show in our pre-print today.

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@earltcampbell

Earl T Campbell

2 years

Congrats to newly minted Dr @armanda_oq on passing her viva at @sheffielduni ! We had many years of fun working together on qLDPC codes. Thanks for your understanding & staying the course despite my career moves. Thanks also to examiner @ProfDanBrowne (right of camera shot)

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@earltcampbell

Earl T Campbell

2 years

2022 was an exciting year in QEC with lots of experiments. I'm going to list some that come to mind. Can the hive mind think of any that I missed:

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@earltcampbell

Earl T Campbell

1 month

Surprise speaker at #SEEQA24

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@earltcampbell

Earl T Campbell

6 months

This is an awesome paper. Congrats to the IBM team! Exciting to see qLDPC on a Nature cover. I am also going to shamelessly piggyback on this to shoutout to @QuantumGizmos who wrote the open-source BPOSD library used in this, and many other papers!

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GitHub - quantumgizmos/ldpc: A belief propagation decoder for low density parity check (LDPC) codes

A belief propagation decoder for low density parity check (LDPC) codes - GitHub - quantumgizmos/ldpc: A belief propagation decoder for low density parity check (LDPC) codes

@jaygambetta

Jay Gambetta

6 months

I’m thrilled to share that a new paper has been published as the cover story of Nature, with the results of the paper charting the path towards quantum error correction. IBM Quantum Blog: Nature article:

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Earl T Campbell

11 months

In the latest shock @openai news, Sam and the whole Openai team pivot to quantum computing...!

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Earl T Campbell

3 years

JOBS. Bye bye NiSQ. Hello QEC. Riverlane’s strategy is focused on error corrected quantum computers and we are hiring more QEC researchers!

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@earltcampbell

Earl T Campbell

1 month

Underpinning reason for most NISQy no go results is that log depth circuits under depolarizing noise suffice to make any state maximally mixed. Quek @ #SEEQA24

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@earltcampbell

Earl T Campbell

11 months

I collected my post- #qec23 thoughts and blogged them. Happy reading and thanks @BartlettQuantum for putting on such a great event :)

@RiverLane_io

Riverlane

11 months

🔥QEC has arrived ⚛️Neutral atom shock 📈Erasure qubits' rise 💡Real progress in real-time decoding ❌Circuits NOT codes ✅qLDPC goes mainstream Our VP of #quantumscience @earltcampbell shares his #QEC23 insights: #quantumcomputing #QuantumPhysics

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Earl T Campbell

3 years

Julian Kelly of Google saying error correction is crucial to quantum computing. #qip2022

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@earltcampbell

Earl T Campbell

2 years

That moment when you think your paper is all wrong, but then realise it is fine. Phew.

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Earl T Campbell

1 month

Keisuke Fuji making the case for researching early-FTQC regime with logical error rates of 1 in a million.

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@earltcampbell

Earl T Campbell

10 months

I’m thinking of writing a short review of QEC in ‘23. What would be on your list of biggest QEC breakthroughs of the year? (zero originality points if your answer mentions 48 logical qubits realised in neutral atoms). I have my own list but curious what the crowd thinks….

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@earltcampbell

Earl T Campbell

10 months

Status of NISQ from the man who invented the phrase NISQ.

@JacobBiamonte

Jacob Biamonte

10 months

Status of NISQ by @preskill

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@earltcampbell

Earl T Campbell

2 years

One pandemic / 3 years later: I am on a train to teach again at ⁦ @sheffielduni ⁩ where I will be lecturing 4th year quantum computing. (Hence missing #qip2023 this week) Still mainly at ⁦ @RiverLane_io ⁩ but doing a little lecturing on the side.

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@earltcampbell

Earl T Campbell

6 months

Given that a *lot* of academics use QISkit for teaching, it would help them if these announcements gave a bit more warning. And that changes happen comfortably out of term time. Luckily my student's project deadline is April

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Focus on utility-scale computing - retirement of cloud simulators and IBM Quantum Lab | IBM Quantum...

Read about this transition, and how to use other tools, such as Qiskit Runtime local testing mode, to efficiently simulate your workloads.

docs.quantum.ibm.com

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@earltcampbell

Earl T Campbell

1 year

11 pages, 4 figures, comments welcome. [2309.05558] A real-time, scalable, fast and highly resource efficient decoder for a quantum computer

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A real-time, scalable, fast and highly resource efficient decoder...

To unleash the potential of quantum computers, noise effects on qubits' performance must be carefully managed. The decoders responsible for diagnosing noise-induced computational errors must use...

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@earltcampbell

Earl T Campbell

6 years

A year ago I would have said it was unlikely to be possible, and I would have been wrong. Constant overhead fault tolerance with an efficient decoding algorithm.

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@earltcampbell

Earl T Campbell

11 months

Key advances in neutral atoms that enabled their QEC experiments, included a revolution in 2 qubit gates going from 97% fidelity to 99.5% in a few years, just using a global pulse! #qec23

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@earltcampbell

Earl T Campbell

1 year

Invited speakers for QEC 2023 in Sydney. With the landmark QEC experiments in recent years, the invited talks focus more on the experimental side than in previous QECs. Submitted talks from experimentalists encouraged. (deadline 30th June)

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@earltcampbell

Earl T Campbell

11 months

Great talk on QEC experiments on neutral atoms by the Harvard team, ends with a look ahead of what can be achieved with current technology. A clear path to 100 logical qubits and 10^-5 logical fidelity. Reloading lost atoms key next step to scaling. #qec23

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@earltcampbell

Earl T Campbell

11 months

Goodbye #qec23 It was a blast. The people, the talks, the location, the food, did I mention the location. Definitely up there in the runnings for best all-round conference ever.

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@earltcampbell

Earl T Campbell

4 years

Virtual FTQT Workshop (11-20th Aug 2020) The Benasque Fault-Tolerant Quantum Technologies workshop will now take place as a free online event. The full talk schedule and links to register can be found here:

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@earltcampbell

Earl T Campbell

1 year

Feeling very excited with the expanding scope of my role at @RiverLane_io Get in touch to learn more about what Riverlane is doing in quantum computing. We are always looking for new partners and collaborators :)

@RiverLane_io

Riverlane

1 year

Huge congratulations to @earltcampbell for his move into the leadership team at Riverlane as VP Quantum Science.👏🎉 Earl will continue to lead the way on our research in quantum error correction.

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Earl T Campbell

8 months

Fujii making the case for earlyFTQT architecture with 10k physical qubit and QEC (but not full magic state distillation. A regime that feels within striking range! I agree there are many interesting what/how questions for earlyFTQT architectures.

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@earltcampbell

Earl T Campbell

4 years

@jenseisert Because 280 characters are not enough for most German words ;)

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@earltcampbell

Earl T Campbell

29 days

Fascinating talk from Babbush on a new class of quantum algorithms that use decoders as subroutines (run on superposition). Great final talk for the conference. #SEEQA24

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Earl T Campbell

3 years

Naomi of PsiQauntum saying error correction is crucial to quantum computing. #qip2022

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Earl T Campbell

4 years

The #QIP2021 interface is amazing! Yet, I still miss seeing you all in person.

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@earltcampbell

Earl T Campbell

3 months

What next for Riverlane? Broadly, it is QEC, with a side order of QEC,.... More specifically, you can read here:

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Introducing Riverlane’s Quantum Error Correction roadmap - Riverlane

We’re building the first prototype MegaQuOp-scale QEC stack by 2026 called Deltaflow Mega, with intermediate releases every year.

www.riverlane.com

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@earltcampbell

Earl T Campbell

3 years

Thanks for the feedback Twitter people. Lattice surgery epic tome v2 now defines all words in the title and has a spacey-timey-wimey diagram for those visual thinkers out there....

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@earltcampbell

Earl T Campbell

6 years

Fantastic #QIP2019 . For me, the biggest "surprise" on the last day with Isaac Kim's talk which gave real hope for reliable QC without error correction.

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@earltcampbell

Earl T Campbell

6 years

On a very early (the earliest) train from Sheffield to Cambridge for the first day of my part job / side job at @RiverLane_ quantum computing startup. Train is very empty and cold.

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@earltcampbell

Earl T Campbell

10 months

Wow… open referee reports really do change the reading experience! Working through the point that @ShrutiPuri11 highlights here. My understanding so far…

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@earltcampbell

Earl T Campbell

5 years

Thanks for all the well-wishing Twitter. I feel OK already, so assuming COVID, it was quite mild and short for me. But my wife is still recovering at home, so can be significant variation even for people of similar age & general health.

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@earltcampbell

Earl T Campbell

7 months

And the 2024 prize for best marketing stunt at #APSMarchMeeting goes to ⁦ @qbloxquantum ⁩ and Maybell, for putting a quantum computer in the expo hall!

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@earltcampbell

Earl T Campbell

1 year

We're hiring again in #QEC . Considering both junior and more experienced applicants.

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@earltcampbell

Earl T Campbell

1 month

Ion traps the Oxford ion way! No more lasers, all electronic (via microwave) control. Tackling the limitations of lasers mentioned in the previous talk. #SEEQA24

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@earltcampbell

Earl T Campbell

7 years

Today I had a new experience. A PhD applicant turned down an interview because they had already accepted a job at a quantum computing company! Another sign the field is evolving.

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@earltcampbell

Earl T Campbell

1 year

I have completed the pre-long-haul flight tradition of printing an overly optimistic pile of papers to read on the plane.

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@earltcampbell

Earl T Campbell

1 year

Minding the gap. Accepted in STOC and recently published! Joint work that started at AWS with Alex Dalzell, @nicola_pancotti and @fgslbrandao , and finished up after I joined @RiverLane_io . Summary below...

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Mind the Gap: Achieving a Super-Grover Quantum Speedup by Jumping to the End | Proceedings of the...

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@earltcampbell

Earl T Campbell

11 months

Mike Newman on the google “milestone 2” QEC experiment. “This is the most exciting time to be in the field.” #qec23

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@earltcampbell

Earl T Campbell

6 years

Hello twitter. I wrote a blog post on one of my favourite wide open problems in quantum computation. Until closed, it leaves open the possibility that BQP=BPP, NP=P and other heresies!

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@earltcampbell

Earl T Campbell

2 years

Where are the best places to post quantum computing jobs? Other than just spamming my twitter followers?

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Earl T Campbell

8 months

⁦ @RiverLane_io ⁩ simulations on Fujitsu device win second place at Fujitsu quantum day. Ophelia Crawford saying few words. Science presentation by Joan tomorrow (more tweets to follow) and academic paper in the works.

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@earltcampbell

Earl T Campbell

4 years

For #PoulinsGreatestHits I'm picking a classic B-side from the noughties. A beautiful explanation of message-passing and the difference between hard/soft decoding. So many later papers made more sense after I read this:

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Optimal and Efficient Decoding of Concatenated Quantum Block Codes

We consider the problem of optimally decoding a quantum error correction code -- that is to find the optimal recovery procedure given the outcomes of partial "check" measurements on the system. In...

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@earltcampbell

Earl T Campbell

1 year

On the front page of PRX (for now)

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@earltcampbell

Earl T Campbell

4 years

Wow. 169 registered attendees and counting for FTQT starting next week. These online conferences do get a lot of attendees!

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@earltcampbell

Earl T Campbell

4 years

Today's paper disco dance for our @awscloud fault-tolerant quantum computer design: from cat-code qubits with realistic noise, through biased noise error correction, two new Toffoli prep protocols, then resource counting the Hubbard model

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@earltcampbell

Earl T Campbell

1 month

Packing ions in a single trapping potential. Nice, familiar 1D strings, but some wild stuff possible in 2D. A comment on zones traps but Monroe is skeptical and still advocates optical networking, though entanglement gen is very slow today with optical interconnects. #SEEQA24

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@earltcampbell

Earl T Campbell

6 years

Important #qip2019 news. The Microsoft socks fit.

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@earltcampbell

Earl T Campbell

4 months

Great work from the team on a new decoder that can handle qLDPC codes. Say hello to ambiguity clustering, built on top of message-passing algorithms as a first stage but with a much lower complexity second stage than BP-OSD.

@StasiuWolanski

Stasiu Wolanski

@StasiuWolanski

4 months

Introducing Amiguity Clustering, a new decoder for general qLDPC codes more accurate and 150x faster than BP-OSD at realistic physical error rates. We can decode IBM's 144-qubit 'Gross code' in 280μs with no loss of logical fidelity over BP-OSD.

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@earltcampbell

Earl T Campbell

1 year

Please can someone run this interview through a quantum computer executing Kaku's well known fact-checking algorithm...

@DulwichQuantum

Dulwich Quantum Computing

@DulwichQuantum

1 year

@MichioKaku : "Quantum computers can act as a fact checker on ChatGPT." @JoeRogan : "It's going to be able to discern what's real and what's not real?" @MichioKaku : "Yes, and even gradations of what's true. It can give you detailed understanding of what is partially correct."

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@earltcampbell

Earl T Campbell

3 years

Registered for QIP! In Person! Fingers crossed...

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@earltcampbell

Earl T Campbell

6 years

An EPIC project on classical simulations (60 qubits on a laptop) of few nonClifford circuits has finally hit the arXiv. Bigger collaboration than I'm used to and was a joy to work with everyone involved:

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@earltcampbell

Earl T Campbell

8 months

At Fujitsu quantum day in Delft. Nakamura tells us, “building a superconducting is like climbing a mountain, as you ascend to one peak you realise there is a another” (or similar)

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@earltcampbell

Earl T Campbell

4 years

A 2D layout for the "bottom up" Toffoli protocol that prepares Toffoli state using just cat/repetition encoding. Ultra-low footprint and gets you down to ~10^{-6} Toffoli error rate territory. Page 30 of

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@earltcampbell

Earl T Campbell

2 years

Today I was meant to be flying to New York for the IBM QEC summer school. But, after holding out a long time, I finally got covid. Disappointed not to be attending in person and will see what I can do remotely (and depending on sickness levels)

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@earltcampbell

Earl T Campbell

7 months

I am here! First day and keen to see some talks and meet people.

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@earltcampbell

Earl T Campbell

11 months

I posted this once already on Friday afternoon but for those who logged off over the weekend.... Here is my synopsis of #qec23 And since last week the recorded talks have appeared on YouTube

Talks from QEC23 - 6th International Conference on Quantum Error Correction, Sydney

www.youtube.com

@RiverLane_io

Riverlane

11 months

🔥QEC has arrived ⚛️Neutral atom shock 📈Erasure qubits' rise 💡Real progress in real-time decoding ❌Circuits NOT codes ✅qLDPC goes mainstream Our VP of #quantumscience @earltcampbell shares his #QEC23 insights: #quantumcomputing #QuantumPhysics

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Earl T Campbell

7 months

@RiverLane_io is 100% QEC. In the early days RL worked on NISQy algorithms, but pivoted about 3 years ago. So if you look at older papers you might get a NISQy vibe. But if you look at the website, products or papers from the last year or two, it is pure QEC.

@decodoku

James Wootton

7 months

I get the sense that most quantum software startups are focussed on a NISQ advantage. Who is out there betting on fault-tolerance?

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Earl T Campbell

3 months

My post on how we are spreading our bets on qubit/code types @RiverLane_io

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How to develop the Quantum Error Correction Stack for every qubit - Riverlane

Different qubit types have different strengths and weaknesses. Some have fast response times but operate at near 0K temperatures. Others have unmatched stabi...

www.riverlane.com

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@earltcampbell

Earl T Campbell

11 months

NB: juicy very early results on surface code QEC experiments by quantinuum. #qec23

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Earl T Campbell

3 years

Fernando Brandao of AWS saying error correction is crucial to quantum computing. #qip2022

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@earltcampbell

Earl T Campbell

1 year

Dong An sketches the proof of beautiful theorem on how to convert time dependent non unitary dynamics into a linear combination of unitaires. At #qsim2023

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@earltcampbell

Earl T Campbell

1 month

Suguru endo. Commenting on exponential overhead: “Does this mean error mitigation is useless? I don’t think so!” caused some laughter in the audience. It is all in the delivery.

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@earltcampbell

Earl T Campbell

4 years

Me this morning "On random quantum circuits and their uses for compilation". Thanks for the invitation #IWQC20 . Take note @markwilde of my title choice ;)

@AleksKissinger

Aleks Kissinger

@AleksKissinger

4 years

@earltcampbell kicked off #IWQC20 this morning with a great overview of quantum circuit synthesis and randomized synthesis, from Solovay-Kitaev to present: Nice talk. Learned lots. @cambridgecqc #QuantumWeekOfFun

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Earl T Campbell

1 month

Benjamin group dinner of present, past and distant past members. Me and @jfitzsimons were the first 2 PhD students in Simon's group in 2005. Postdocs at the time in Simon's group included the super trio: @ProfDanBrowne , Pieter Kok and Brendan Lovett. The door sign read...

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@earltcampbell

Earl T Campbell

11 months

Cool poster with a surprise conclusion! Yingjia implemented a side observation from my 2019 single shot paper that EVERY code can be made single shot by changing the choice of generators, and they did it for the 2D surface code. And…

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@earltcampbell

Earl T Campbell

4 years

A satisfying figure to make on page 113 of outlines a compact layout for a Toffoli magic state factory using a combo of repetition and surface code patches. Converts 8 TOF -> 2 TOF states with slightly better than quadratic error suppression.

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Earl T Campbell

6 years

Great talk by @QuantumGosset on our stabiliser rank simulator collaboration between @IBMResearch @sheffielduni @UCLQuantum and @NQIT_QTHub

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Earl T Campbell

1 year

Phys. Rev. X 13, 031007 (2023) - Improved Decoding of Circuit Noise and Fragile Boundaries of Tailored Surface Codes

Improved Decoding of Circuit Noise and Fragile Boundaries of Tailored Surface Codes

New, efficient, classical software for controlling quantum error-correcting codes exploits the structure of relevant noise models to outperform the state-of-the-art in terms of accuracy.

journals.aps.org

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Earl T Campbell

7 years

Martinis: 22 qubit chip. Sure it will scale up to 49+ qubits! #QEC17

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Earl T Campbell

8 months

Fujii on the progress towards QEC. “The decoding problem is like minesweeper, you are only given partial information and need to find the mines”

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@earltcampbell

Earl T Campbell

11 months

Shraddha Singh pitched GKP encoding qubits as the perfect marriage of harmonic oscillator and 2 level system approaches. Singh will be talking about how to do gates / teleportation with GKP. #qec23

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@earltcampbell

Earl T Campbell

5 years

Not feeling so good the last day. Countermeasures include paracetamol and liquid kale. My wife has been unwell for over 1 week, 2 GP's say she probably has (moderate) coronavirus. No test unless hospitalised but a lot of home medication.

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@earltcampbell

Earl T Campbell

2 years

Yes! Nice definition and well made point. We need to stop teaching QEC as being principally concerned with codes.

@theeczoo

Error correction zoo

2 years

Barbara Terhal's #QIP2023 tutorial takes off with a philosophical definition of a code as a mechanism that preserves the flow of quantum information in an ever expanding and noisy environment.

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Earl T Campbell

4 years

Love this slide in @yuansu_umd 's #QCTIP talk. Also great was the last slide where product formula girl makes a new friend.

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@earltcampbell

Earl T Campbell

5 years

Very pleased with Dominic Berry's viewpoint on my @PhysRevLett published today. I wanted to add further to the commentary by linking to a blog post I prepared a few weeks ago

A Random Approach to Quantum Simulation

A new way to simulate a molecule is potentially much faster than other approaches because it relies on random—as opposed to deterministic—sequences of operations.

physics.aps.org

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@earltcampbell

Earl T Campbell

1 month

Hello Seeqa conference at Merton college. I feel nostalgic to be back in Oxford

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@earltcampbell

Earl T Campbell

11 months

Piggy backing on the #qec23 action to point out that while the next QEC will most likely be in 2025 (host bids welcome), in 2024 there is an FTQT24 happening in Benasque.

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Earl T Campbell

11 months

Newly arrived just in time for winter.

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Earl T Campbell

2 years

Quantum twitter discussing the QIP acceptance question again! For those interested in QEC conference, there is a push currently towards securing a 2023 date and formalising QEC’s structure to ensure it happens regularly. A salient question is how often QEC should happen:

every year

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every two years

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every three years

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Earl T Campbell

11 months

The scenic route to #qec23

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Earl T Campbell

10 months

Looking forward to hearing what my old friends at AWS have done since I left. Does a logical qubit mean a single cat qubit, or a cat combined with repetition code? From this one slide guessing it will be a single cat.

@letonyo

Anthony Leverrier

10 months

Looks like AWS reached a milestone! Looking forward to more details!

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Earl T Campbell

6 years

QEC is open for abstract submissions, please do send your best quantum error correction papers

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Earl T Campbell

4 years

The end result of a seed idea from a Sheffield beer garden conversation with visitors. Many years ago in a different era.

@PRX_Quantum

PRX Quantum

4 years

Classical simulation of quantum circuits is investigated in the context of quantum resource theories, bringing up several fundamental insights and leading to improved simulation algorithms. @BartoszRegula @YingkaiOuyang @earltcampbell @UCLQuantum @NTUsg

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Earl T Campbell

1 year

How to make two of my favourite things play nicely together: biased-noise and qLPDC codes! Also one of the last collaborations started in Sheffield when me, @armanda_oq and @QuantumGizmos were there, finally now published. A nice vid on this

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Bias-Tailored Quantum Error Correction - Joschka Roffe & Oscar...

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@quantumjournal

Quantum

@quantumjournal

1 year

Quantum has recently published: Bias-tailored quantum LDPC codes by Joschka Roffe, Lawrence Z. Cohen, Armanda O. Quintavalle, Daryus Chandra, and Earl T. Campbell

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Earl T Campbell

11 months

#qec23 venue carpet seems to represent an anyonic braiding pattern on a 2D topological code. 😂

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Earl T Campbell

11 months

⁦ @CraigGidney ⁩ . Humour is important! Funny papers get more internet points than major milestone google papers. #qec23

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