It is that time of year again! The @unitary.foundation qOSS survey is here! Please consider filling it out if you are using, developing or maintaining any quantum OSS like @pennylaneai.bsky.social or similar unitary.foundation/posts/2025_q...

The first novel thing I did in quantum computing was find a way add +1 to a register using O(1) space and O(n) gates. For 10 years I've wanted to know how to generalize that from x+=1 to x+=C... and I finally figured out a way to do it! arxiv.org/abs/2507.23079

New opening in the QML team @ Xanadu! xanadu.applytojob.com/apply/v1gc8F...

I'm giving an (online) talk next Monday. Be there or be square 🟥 www.thewiser.org/agenda

Spotted: A photonic GKP state in the wild 🕵️‍♀️ so cool to see! www.nature.com/articles/s41...

Job ad 🧵 2/2 Quantinuum are looking for software engineer to help design and implement quantum programming languages. You need to have OPINIONS about types. Full-time, permanent, based in Cambridge in England. #jobad #quantum #quantumcomputing #pl #proglang jobs.eu.lever.co/quantinuum/6...

Job ad 🧵 1/2 Quantinuum are looking for QEC person to join our compiler team. Ideally you know lots about QEC and a bit about compilers but the other way could work too. Full-time, permanent, based in Cambridge in England. #jobad #quantum #quantumcomputing #qec jobs.eu.lever.co/quantinuum/d...

Trying to understand fault tolerant architectures without getting into the nitty gritty details of surface code physics: The Game of Surface Codes 🐉 pennylane.ai/qml/demos/tu...

we're starting an encyclopedia style database for passes and concepts in quantum compilation pennylane.ai/compilation what sort of things would people expect and like to see here?

Consider this a warning. Factoring small numbers is a bad benchmark. Because the key to factoring small numbers isn’t making the quantum computer "work well". That’s the key to factoring *large* numbers. For small numbers it's sufficient to generate a far-too-large circuit, and light the fuse.

I am very happy to announce that I will soon join @iftuamcsic.bsky.social as a Ramon y Cajal Fellow ‼️ I am also offering a PhD position on "Quantum Algorithms for High-Energy Physics" ⚛️ Deadline is April 30 and the details can be found here: www.gonzalez-cuadra.com/open-positions Please share!

What I gather from the most recent DWAVE saga. TLDR: I don't think the spoofers have a done a very good or convincing job here 🤷

For a little bit of light in these trying times, I present to you: quantum memes! These are made by my Physics 438a class for extra credit on their midterm (which they are taking at this moment). As always, I take all credit for good memes and no blame for bad ones.

Any high level but technical explanations of DeepSeek that doesnt talk about nvidia stock out there? How did they build something seemingly competitive / superior with much fewer means?

Looking for a talented postdoc to join my group (the Computational Quantum Science Lab) at EPFL, in Lausanne 🇨🇭 Research Topics Include: Neural Quantum States, Many-Body Systems, Ab-Initio & Quantum Chemistry...etc Start: Fall 2025, excellent conditions Apply: www.epfl.ch/labs/cqsl/jo...

high praise

when you accidentally drink non-decaf coffee and your brain is yelling every thought aaaaaaaaaa

We recently released a software package to optimize IQP circuits that scales to millions of qubits and gates. Our main motivation was quantum machine learning (paper on the way!), but we believe there could be many other applications. arxiv.org/abs/2501.04776 github.com/XanaduAI/iqp...

Do you remember the feeling when you finally fully grasped SVD and realized your linear algebra powers have no limits now? You can re-live that moment by learning about the KAK decomposition for the unitary group! pennylane.ai/qml/demos/tu... awesome summary by @dwierichs.bsky.social

Happy np.sum(np.arange(10)**3) erveryone!

Seeing our software and resources be used by other researchers and practitioners in the qc space gives me extreme "academic pride", for a lack of better words 🥲  Here's to more well-documented code in 2025

I can do a computation on my smartphone in a few seconds that would take the Antikythera mechanism longer than the age of the universe. Therefore we must live in a multiverse □ (or at least my smartphone lives in one)

History doesn't repeat - but sometimes it rhymes. In the 2010s, tiny dev teams built products w massive impact. A company with just 13 developers served 30M users. In 2024, a company with just 15 developers is serving 25 million users. Bluesky deepdive: newsletter.pragmaticengineer.com/p/bluesky

That whole septillion years bit is so misleading and prone for misinterpretation, I'm not even mad people outside the academic bubble take it the wrong way (though the confidence of some people with their hot takes is honestly mind-boggling and hilarious)

TFW *gets error message* *checks code* code seems fine, let's run the same code again *gets same error message* *surprise* 🤔

I think we can slowly start to call X, formerly known as Twitter, X, and BlueSky, Twitter

Beautiful

Are there already established de-facto standards for quantum compilation passes? (FT / NISQ) Stuff like TODD, ZX full_optimize, ... ? What else?

learned that overleaf is down today, so a good chance to advertise typst.app it's a "new latex" if you will. once you go typst, writing latex (and using overleaf) will feel like ancient technology, so use with caution (in particular if you still depend on latex submissions to journals 😬)

The prospect of doing a serious application with 10^7 Toffoli gates on 117 (logical) qubits is exciting! 🚀 arxiv.org/abs/2411.13669

Just created a Quantum Computing Starter Pack. Please reach out if I missed to add you. go.bsky.app/KBgRwmZ

It drives me nuts that the notation of the time-ordered exponential implies that it is a function Texp(∙) with an integral as its argument inside 🤬 Full rant: pennylane.ai/blog/2024/09...

I guess it makes sense to have a re-introductory post now that I'm here more! Hi, I'm Ieva (with an 'i'), I work on quantum algorithms at a startup called Phasecraft in London and I enjoy pondering cool and sometimes silly math/science questions :)

I tried to write up an intro to (dynamical) Lie algebras for quantum practicioners as the topic keeps poping up pennylane.ai/qml/demos/tu...

Welcome to all the new #quantumcomputing (and adjacent) people moving here 😍 @dwierichs.bsky.social @gppcarleo.bsky.social @quantumearl.bsky.social @decodoku.bsky.social @abohrdt.bsky.social @danielgc25.bsky.social @vasmer.bsky.social @physicssteve.bsky.social @dulwichquantum.bsky.social

any quantum computing people here? #quantumcomputing

Entropy question: If I have a density matrix that is a little bit negative (as in has some small negative eigenvalues) from approximate reconstruction, what is the best way to treat that for computing e.g. von neumann entropies (which doesnt like negative values in its logarithm)?

Intel's latest quantum processor. "We're looking at the long-term goal, that we will need millions of qubits to do anything of value." sg.news.yahoo.com/intel-launch...

Good news: Nature is not worried tho www.nature.com/articles/d41...

In quantum theory, the classical limit is often given by ℏ→0. But what about when the particle is interacting with another system which we continue to treat quantumly? Isaac Layton and I found that ℏ→0 is not enough! You must also kill entanglement. scirate.com/arxiv/2310.1... 1/3

"classical approximations have continued to verify the value of our experiment — but differ among each other by a significant amount. For the first time, we can use quantum as a source of truth against which we can benchmark classical approximation methods." odd spin on this 🙃 tinyurl.com/dhy2bejj

First post on the new platform. How many physics enthusiasts are here already?

It's not perfect, but a great watch. I haven't thought that much about conservation of momentum since undergrad 🥲

So there is apparently a new tool which automatically does a literature search based on any prompt across all of arXiv and then presents the results, including detailed analysis of each paper, why it's relevant to the search and its level of relevance app.undermind.ai/query_app/di...

Since the dawn of time, humans have rehearsed imaginary conversations in which they come out triumphantly ahead of a hapless opponent. Social media just provides an endless stream of fodder for this ubiquitous pastime.

Welcome @frmetz.bsky.social !!

What is the current status of post-quantum cryptography? (I.e. classical cryptography that cannot be cracked by Shor's) Every now and then I read that one of them got cracked, but are there any that have lasted so far? And that are already implemented somewhere?

Thanks @qottmann.bsky.social for the invite 🎉 Feels good around here.

Welcome to all new fellow scientists that recently joined, great to have you here! ✌️🤗 @phfaist.bsky.social @hyperboieva.bsky.social @quantumk.bsky.social @faehrmion.bsky.social @markusheinrichs.bsky.social