Bálint Pató

Which book is it?

You know you worked too much in QEC when you misread Senate in a news article for Steane.

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!

...with Natalie Klco is now available on arXiv: scirate.com/arxiv/2602.2...

Only in theories with periodic electric fields will work with stabilizer GLQEC. Other trade-offs popped up as we simulated the Rajput-Roggero-Wiebe QEC scheme, including a higher mixing speed in the logical channel compared to using a regular old application-agnostic QEC scheme. Our new paper...

Have you ever wondered about the dimensionality of the massive Schwinger model with a two-dimensional, non-periodic electric field? Well, we counted it and proved that it follows the bisection of the Lucas numbers (oeis.org/A005248). This leads to incompatibility with Gauss's law stabilizer QEC.

An upbeat blog post for Christmas: Quantum Error Correction goes FOOM

algassert.com/post/2503

QUITS: A modular Qldpc code circUIT Simulator Mingyu Kang, Yingjia Lin, Hanwen Yao, Mert Gökduman, Arianna Meinking, and Kenneth R. Brown, Quantum 9, 1931 (2025). To achieve quantum fault tolerance with lower overhead, quantum low-density parity-...

QUITS now out in Quantum
quantum-journal.org/papers/q-202...

Circle Up! Journeymen 2025 Mentoring Annual Fundraiser What's next for Journeymen?

Journeymen is a long-running organization that fosters healthy masculinity and starts education and mentorship early with teenage boys. Please consider donating through my page, where you can see how and why I got involved. @givebutter givebutter.com/c/circleup25...

Quantum Computer (SQuInT 2025) | Mark Wilde Quantum Computer (SQuInT 2025) by Mark Wilde, Rock music from Ithaca, NY on ReverbNation

After #SQuInT2025 concluded, @balintpato.bsky.social , Cole Maurer, & I opted for a post-conference discussion on quantum computing, its capabilities, public perception of it, and various geopolitical issues that have arisen recently. Recording available here:

www.reverbnation.com/markwilde/so...

I feel very grateful towards the #QEC25 organizers and the QEC community! I had an amazing time, came out with a ton more knowledge, new collaborators, new friends, some great times with old friends, and even new paths towards job opportunities!

YouTube video by Bálint Pató PlanqTN intro

7/
PlanqTN is here.
Build quantum codes like LEGO.
Play, hack, and contribute.
🎥 youtu.be/TNnE3hReYVk
🌐 planqtn.com
🔗 github.com/planqtn/plan...
#QuantumComputing #QEC #OpenSource #QuantumLEGO #AItools #TensorNetworks #PlanqTN

6/
I built PlanqTN Studio from scratch in 4 months with the help of
@cursor_ai
. It was a fantastic experience!
💻 Learned React, Zustand, Supabase, Terraform
⚡️ AI prototyping: 6–7× faster
🛠️ Full dev: ~2–4× faster

5/
Massive thanks to:
🧠 Charles Cao & Brad Lackey for the foundational QL framework + support
🎓 June Vanlerberghe (Duke MS student) already using PlanqTN in research
🧑‍🏫 Ken Brown for giving me the space and support to do this
🪙 Unitary Fund for the microgrant + encouragement

4/
Coming soon:
📚 QL layout database
⚙️ Optimized contraction (C++ / GPU)
🔄 non-Pauli Logical ops
🧠 Qudit support
If this sounds cool — we’re open source and would love contributions!

3/
Weight enumerators? Yep.
PlanqTN + Cotengra = compute them on any QL layout.
⚡ Way faster than brute force (though still #P-hard) for most interesting cases.

Tensor networks meet actual usability.

2/
PlanqTN lets you learn, build, and analyze tensor network QEC codes interactively.
🧱 Quantum LEGO
🌀 ZX calculus
📈 Graph states
🧮 Stabilizer codes
All in one interface: PlanqTN Studio.
Explore features: planqtn.com/docs/features

1/
🚀 Super excited to launch PlanqTN — an open-source Python lib + interactive web app for exploring quantum LEGO-based QEC codes!
🎥 Intro video: youtu.be/TNnE3hReYVk
🔗 GitHub: github.com/planqtn/plan...
🌐 Studio: planqtn.com

Riverlane's Quantum Error Correction Pack Join the conversation

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]

RETRACTED ARTICLE: Quantized Majorana conductance - Nature In a step towards topological quantum computation, a quantized Majorana conductance has been demonstrated for a semiconducting nanowire coupled to a superconductor.

This is a mega-thread of all Microsoft problems related to topological qubits.

NOTE: I skip the numerous news reports and press releases, this thread is for serious _scientific_ and procedural materials

First retraction: Quantized Majorana Conductance, from Nature

www.nature.com/articles/nat...

These notes are great for a somewhat beginner level too - they helped me get intuition even before I started my PhD.

Great reference on the role and power of homology in constructing the surface code: notes by Dan Browne. drive.google.com/file/d/1AB0K...

Happy International Year of Quantum Science & Technology! #IYQ2025

Intuition about Knill-Laflamme QEC conditions The Knill Laflamme QEC conditions are stated this way: We consider a code space $C$ and its associated projector $P_C$. We consider a noise acting on our system: $E(\rho)=\sum_a E_a \rho E_a^{\da...

In case you were ever confused by the Knill-Laflamme conditions for QEC codes - I drew a picture of it on the QC StackExchange quantumcomputing.stackexchange.com/a/40802/4986... #quantum

A local automaton for the 2D toric code We construct a local decoder for the 2D toric code using ideas from the hierarchical classical cellular automata of Tsirelson and Gács. Our decoder is a circuit of strictly local quantum operations pr...

scirate.com/arxiv/2412.1... looks very interesting - I always found cellular automaton decoders fascinating. I guess if these result all hold - this might provide a way forward towards an even more scalable locally decodable surface code? I wonder what the catch is? Any thoughts here?

When we've been there in a group
closed under the sum,
To represent we took the trace,
character has first begun.
4/4

Density matrices are fun
to observe with the trace!
Mean was lost, but now is found,
in the large Hilbert space.
3/4

’Twas trace that taught my heart to fear,
and trace my fears relieved;
How precious did that trace appear
the hour I first believed!
2/4

let this be my first #quantum post.

Amazing trace, how sweet to sum
all the diagonals, O_aa (oh-a-a)!
No basis missed, all can come
they'll sum to the same
1/4

Yes, please!