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Reposted by Josu Etxezarreta Martinez

Christopher K. Long @christopher-k-long.bsky.social · 21d

Ever wanted to use virtual Z gates with arbitrary powers of SWAP? Introducing the virtual Z pulse: arxiv.org/abs/2509.13453. In our new article, we present a method for distorting a pulse sequence to implement single-qubit Z controls virtually.

From virtual Z gates to virtual Z pulses

Virtual $Z$ gates have become integral for implementing fast, high-fidelity single-qubit operations. However, virtual $Z$ gates require that the system's two-qubit gates are microwave-activated or nor...

arxiv.org

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Josu Etxezarreta Martinez @katutxakur.bsky.social · Aug 6

I will be presenting a poster about this next week at the QEC25 conference so anyone attending and interested please come check it out!

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Josu Etxezarreta Martinez @katutxakur.bsky.social · Aug 6

In the V2 we include updated results for the bivariate bicycle codes, a timing analysis for those, surface code performances and a detailed analysis of the sparsification routine.

You can find the paper here: arxiv.org/abs/2409.01440

An almost-linear time decoding algorithm for quantum LDPC codes under circuit-level noise

Fault-tolerant quantum computers must be designed in conjunction with classical co-processors that decode quantum error correction measurement information in real-time. In this work, we introduce the ...

arxiv.org

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Josu Etxezarreta Martinez @katutxakur.bsky.social · Aug 6

Check out the V2 of our qLDPC decoding paper "An almost-linear time decoding algorithm for quantum LDPC codes under circuit-level noise". The meme summarizes our approach. @qec.codes

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Reposted by Josu Etxezarreta Martinez

Christopher K. Long @christopher-k-long.bsky.social · Jul 5

How fast can quantum processors run? My coauthors and I answer in our new npj Quantum Information article! Utilising pulse engineering, we prepare molecular ground states in a few nanoseconds, ~100× faster than with gates. Back-of-the-envelope: Simulations can now tolerate T₁ and T₂ ~100× smaller.

Minimal state-preparation times for silicon spin qubits - npj Quantum Information

npj Quantum Information - Minimal state-preparation times for silicon spin qubits

www.nature.com

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Reposted by Josu Etxezarreta Martinez

Christopher K. Long @christopher-k-long.bsky.social · Jun 17

Hi all! I am excited to finally share this suite of quantum optimal control libraries that run up to 100× faster than QuTiP for some tasks. We developed these libraries while working on our preprint arxiv.org/abs/2406.10913, which was recently accepted into npj Quantum Information—keep tuned!
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Sergey Frolov🇺🇦 @spinespresso.bsky.social · Jun 5

I remember getting a $300k grant 10 years ago to perform non-abelian braiding in 2 years

It is funny, but it is also sad. "The people" want miracles from science, right now, and for free. If one is achieved, they move on immediately and just want more, different, fresh like distracted children.

Dave Bacon @dabacon.tachyon.institute · Jun 4

My favorite roadmap is from 2004: qist.lanl.gov/qcomp_map.sh...

“By the year 2007, to

* encode a single qubit into the state of a logical qubit formed from several physical qubits,

* perform repetitive error correction of the logical qubit”

qist.lanl.gov

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Reposted by Josu Etxezarreta Martinez

Dulwich Quantum Computing @dulwichquantum.bsky.social · Jun 2

👇

Brendan Keogh @brkeogh.bsky.social · Jun 2

I think a lot about how Aaron Swartz committed suicide while facing a probably long jail sentence for download some of JSTOR, but no one at Meta is going to face any repercussions for using all of Libgen to train its AI.

Gwen Snyder is undead @gwensnyder.bsky.social · May 31

Someone else said something very similar to this the other day, but.

It really burns me that our (millennials') generation was legally terrorized for like, downloading Radiohead discographies

But we're supposed to be ok with billionaires stealing human intellectual output in its entirety bc AI

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Reposted by Josu Etxezarreta Martinez

Dulwich Quantum Computing @dulwichquantum.bsky.social · May 26

Josu Etxezarreta Martinez @katutxakur.bsky.social · May 26

Check out our latest preprint! The meme summarizes it.

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Josu Etxezarreta Martinez @katutxakur.bsky.social · May 26

Thanks for sharing! I hope to see more QEC memes around!

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Reposted by Josu Etxezarreta Martinez

Riverlane @riverlane.com · May 26

An open call for all #QuantumErrorCorrection researchers to now summarise their work in the form of memes please 🙂 - nice work @katutxakur.bsky.social et al (both the paper and meme!)

#QECpapers

Josu Etxezarreta Martinez @katutxakur.bsky.social · May 26

Check out our latest preprint! The meme summarizes it.

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Josu Etxezarreta Martinez @katutxakur.bsky.social · May 26

Check out our latest preprint! The meme summarizes it.

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Reposted by Josu Etxezarreta Martinez

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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Riverlane @riverlane.com · May 9

We’d love to find more #QEC experts here on BlueSky and have created this starter pack to help connect the error correction community.

It’s just a start – if you’re working QEC, please follow this account and message us. We’ll happily add you to the pack!

go.bsky.app/RiZfVco 🧪

🧵[2/2]

Riverlane's Quantum Error Correction Pack

Join the conversation

go.bsky.app

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Reposted by Josu Etxezarreta Martinez

Dulwich Quantum Computing @dulwichquantum.bsky.social · Apr 22

"By the time we get to million qubits, I will be dead."
--John Martinis

Industry expectations vs actual progress in one of his slides:

Number of qubits plotted as a function of year. Industry expectations vs actual trajectory.

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Josu Etxezarreta Martinez @katutxakur.bsky.social · Apr 7

Check out our latest preprint: SpinHex: A low-crosstalk, spin-qubit architecture based on multi-electron couplers. scirate.com/arxiv/2504.0...

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Reposted by Josu Etxezarreta Martinez

Juan José García-Ripoll @jjgarciaripoll.bsky.social · Apr 6

Estas cosas no hacen más que acentuar la desconfianza de los jóvenes en la carrera académica. Lo que necesitamos son inversiones recurrentes, planificadas y predecibles. 1/

EL PAÍS @elpais.com · Apr 5

La desesperación de los investigadores de posdoctorado por un contrato de la Junta de Andalucía que nunca llega

El Gobierno de Moreno Bonilla convocó en noviembre de 2023 unas ayudas a posdoctorados que aún no se han adjudicado, una demora que ha condicionado su futuro personal y profesional

elpais.com

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Reposted by Josu Etxezarreta Martinez

Michael Nielsen @michaelnielsen.bsky.social · Apr 4

"overcome your inner resistance; it is always a mistake to try to do things too cleverly" - Einstein in a letter to Leo Szilard

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Christophe Vuillot @christophe.vuillot.info · Mar 21

Two talks of Alice&Bob QEC team in parallel this morning:

@diego-ruiz.bsky.social presented his new results on distillation with biased-noise qubits: with bias=30 he already gets 150x reduction!

I talked about implementing rotor codes

So many fun subjects to work on, join our team we are hiring!🐱

Diego presenting his work under the expert eye of Craig Gidney

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Reposted by Josu Etxezarreta Martinez

Quantum Bullshit Detector @bullshitquantum.bsky.social · Jan 30

Improving devices before entering commercialization phase: not bullshit

Sifted @sifted.eu · Jan 29

The startup, launched in 2020, is focusing on improving its devices before it enters a commercialisation phase.

#QuantumComputing #StartupEurope

Quantum computing startup Alice & Bob raises 100m Series B to double down on R&D and open new production site

sifted.eu

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Reposted by Josu Etxezarreta Martinez

Julen Bollain @julenbollain.bsky.social · Jan 26

En España hay 11.914 personas con una fortuna superior a los 30 millones de dólares.

¿Sabías que gracias a Ayuso dos de cada tres ultrarricos españoles no pagan impuesto de patrimonio? No pagan nada porque tienen su fortuna en Madrid.

Pero luego no tiene para la universidades.

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Dave Bacon @dabacon.tachyon.institute · Jan 4

I saw the best minds of my generation destroyed by madness, starving hysterical naked,
dragging themselves through the academic halls at dawn applying for a new grant

Arthur Gessler @arthurobuntspecht.bsky.social · Dec 22

Researchers spend approximately 45% of their time on administrative activities related to #grants rather than actual #research. The current #competition in research #funding has significant drawbacks; evidence-based improvements of the funding system are required: www.pnas.org/doi/10.1073/...

The costs of competition in distributing scarce research funds | PNAS

Research funding systems fundamentally influence how science operates. This paper aims to analyze the allocation of competitive research funding fr...

www.pnas.org

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Reposted by Josu Etxezarreta Martinez

Graeme Smith @graemesmith.bsky.social · Dec 26

“The true measure of learning is not the time and energy you put in. It’s the knowledge and skills you take out.”

By @adamgrant.bsky.social

www.nytimes.com/2024/12/26/o...

Opinion | No, You Don’t Get an A for Effort

High marks reward excellence, not grit.

www.nytimes.com

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Josu Etxezarreta Martinez @katutxakur.bsky.social · Dec 17

Check out our latest preprint "Asymptotically good CSS-T codes exist". There is also a nice discussion about in on scirate.com/arxiv/2412.0...

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Reposted by Josu Etxezarreta Martinez

John Preskill @preskill.bsky.social · Dec 14

I created a transcript of my talk at the Q2B Conference: "Beyond NISQ: The Megaquop Machine." You can read it here:

quantumfrontiers.com/2024/12/14/b...

Beyond NISQ: The Megaquop Machine

On December 11, I gave a keynote address at the Q2B 2024 Conference in Silicon Valley. This is a transcript of my remarks. The slides I presented are here. NISQ and beyond I’m honored to be back at…

quantumfrontiers.com

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