Alexander Cowtan

New paper up on arxiv: arxiv.org/abs/2503.05003

It’s not obvious what exactly you’re supposed to do with a machine that can perform any task you can imagine with at best 70% accuracy

Two more nice papers came out yesterday on logical measurements with stabiliser codes (although the first can in principle be generalised further): arxiv.org/abs/2410.02213, arxiv.org/abs/2410.02753. Very impressive how low the overhead for single logical qubit measurements is now.

Picturing Quantum Software is a brand new book covering state of the art methods in quantum compiling, circuit optimisation, classical simulation, and fault-tolerant quantum computing using the language of the ZX-calculus. Get the preprint for free: github.com/zxcalc/book

Tomorrow we'll have 🗣️ @kenbrownquantum at 10:00⌚ 🗣️ @AlexanderCowtan at 11:30⌚ 👥 experimental panel discussion at 15:30⌚ 🗣️ @ZhuGuanyu at 16:45⌚

I forgot to post about it, but I recently put out a paper with open-source software for performing surgeries with qLDPC codes: arxiv.org/abs/2407.09423. Happily, there are two beautiful papers from today on a similar subject: arxiv.org/abs/2407.18393, arxiv.org/abs/2407.18490.

@DulwichQuantum Hm, the explanation in the video of how quantum computers can break encryption at 36:45 is just wrong, sadly.

For more on Zoom's unmitigated AI enthusiasm and recent dabbling in post-quantum cryptography, watch the full take-down by Angela Collier. youtube.com/watch?v=dKmAg4…

Zoom is post-quantum secure, right? "However, for performance reasons, and given that the threat of a quantum computer is not considered imminent, we do not currently defend against existing quantum adversaries, so our signatures and authentication are not post-quantum secure."

There is a follow-up coming soon, where I apply the formalism to near-term qLDPC codes. This will come with open-source software to automate such surgeries.

Happy to announce that my paper with @fridaysimon has been published: quantum-journal.org/papers/q-2024-… Thanks to the anonymous reviewers and @CVuillot, whose feedback was invaluable.

@HaussernotC Rb4

White to move, mate in 2! There is only one way to do it 🤯

My Masters student from last year, Samo, has put his thesis on arxiv: arxiv.org/abs/2405.03559. It's a very patient and thorough ground-up description of qudit CSS codes. It also has a nice result on the logical spaces, which we believe to be novel (in quantum info anyway).

@ChessifyMe Qc7

How to get to the black King? 🤔 White to mate in 2

@ImShahinyan Kh2

Beautiful mate in 2 🤩 (If you like these puzzles, please follow me!)

@ImShahinyan Nd6

Easy shot ❗️ Mate in 2 (If you like these puzzles, please follow me!)

@HaussernotC Qf3

White to move, mate in 2! Can you solve it in less than 1 minute? ⏳ #chess

@JohanSalomon Qd7

White to mate in 2! 🤔

@ImShahinyan c8N

Gloriously 😎 Mate in 2

@ImShahinyan Bh8

Mate in 2 A creative idea💡

@ImShahinyan Re2

Funny mate in 2 🤣

@ImShahinyan Rf6

White mates in 2