Hey - we've extended Pauli and Majorana propagation to simulating thermal states The trick is to imaginary-time evolve identity and then normalize by the trace of the Pauli (or Majorana) sum at the end The catch is that both our analytics and numerics suggest it only works at high temperatures 🧵👇

Did you know you can simulate quantum states with Pauli and Majorana propagation? In short: High-temperature states are provably and practically sparse, and we can use imaginary time evolution to get there starting from the infinite-temperature state. scirate.com/arxiv/2602.0...

Yanting is keeping you updated on our efforts to continually improve propagation algorithms and our code-base PauliPropagation.jl. This time with memory savings and increased robustness to truncations for simulating quantum systems with certain symmetries ⬆️ ➡️ ⬇️ ⬅️ Expect more in the future! 🚀

I am so, so happy to see this article published as a perspective in Nature Communications: www.nature.com/articles/s41... More than the paper itself, I thoroughly enjoyed chatting with all my co-authors on the implications of the absence of BPs ~ classical simulability connection

Welcoming summer the best way we know how: with pasta, physics, and a phenomenal team 🍝⚛️ A warm #Google #Quantum #AI welcome to Manuel Rudolph, who’s joining us this summer! 🎉 We’re thrilled to have his sharp mind and curious spirit with us Thx Nikita+team for organizing

In case you thought you can't efficiently simulate and sample quantum circuits with 2D tensor networks... Nope, you can. Link: scirate.com/arxiv/2507.1... We simulate IBM's recent quantum chemistry experiments and Williow + heavy-hex Heisenberg dynamics, and showcase modern, verifiable techniques.

Last week, we published a paper that really excites me: "Circuit compression for 2D quantum dynamics" Using Pauli propagation, we (Matteo) were able to compress Trotter circuits for systems up to 30x30 with depth reductions of x2 to x13. Link: arxiv.org/abs/2507.01883

Retweeting this for the folks (myself included) that weren't online over the long weekend PauliPropagation.jl is open source library that you can use to approximately simulate quantum circuits We explain the nitty gritty of how these algorithms work in practise in our latest companion paper 🧵👇

❗New paper and open-source library❗ PauliPropagation.jl is your go-to library for simulating quantum circuits via Pauli propagation. Our paper provides a thorough overview of this new classical simulation method. Paper: scirate.com/arxiv/2505.21606 Library: github.com/MSRudolph/PauliPropagation.jl

UnitaryHACK 2025 has begun - and we are part of it! If you are registered, earn real money by closing GitHub issues in our new library PauliPropagation.jl (github.com/MSRudolph/PauliPropagation.jl). We were supposed to have a nice and "compact" paper out today, but the arXiv gods were not with us.

I'm heading to APS for the week. If you are around, let me know! Or say Hi after my talk in the C34 session on Monday afternoon.

Oh no, tensor networks have out-supremed D-Wave!

In a new preprint arxiv.org/abs/2503.05693, led by Joseph Tindall and Antonio Mello at Flatiron CCQ, we simulate annealing of disordered quantum magnets 🧲 ⌛ and in many cases find better accuracy than recent results from D-Wave devices and leading classical methods (c.f. arxiv.org/abs/2403.00910).

Here we take steps to understanding the potential of warm starts for VQAs We provide a general variance lower bound for patches of loss landscapes: - for both structured and unstructured circuits - to provide small-angle-initialization 'guarantees' - to study the scaling of regions of attraction

New paper on arXiv 🔥 We present a bound that unifies all the previous guarantees of small regions with substantial gradients in BP landscapes. This allows us to study new architectures, parameter correlations, and points on the landscape that could not be analyzed before. scirate.com/arxiv/2502.0...

No way we visit IBM's Yorktown office and don't pose for a silly picture in front of the quantum computer.

Check out the open-source library at github.com/MSRudolph/Pa...!

Another amazing paper from our Summer School student @antonioannamele.bsky.social (is that 3 papers already?!) and from our collaboration with the power house that are @aangrisani.bsky.social and @quantummanuel.bsky.social, from @qzoeholmes.bsky.social! 's incredible group. arxiv.org/abs/2501.13101

Just a friendly reminder that applications to our summer school are open until January 19th 2025!! Apply here if you haven't: lanl-summer-school-programs.wizehive.app/program/quan... Or please complete your application by the 19th

Probably the most impactful 10 weeks of my scientific career so far. Apply if you can!

🚨Applications for LANL's 2025 Quantum Computing Summer School are open! Please apply here 👇 lanl-summer-school-programs.wizehive.app/program/quan... Reposts appreciated!

🙈 Zoe ...

Out today, our latest paper on the theme of: "offload as much work as possible from NISQ hardware" Here we focus on classically simulating small regions ("patches") of an expectation landscape Our algs/theorems apply to dynamical simulation, VQAs and beyond ➡️ scirate.com/arxiv/2411.1... ⬅️ 🧵👇

Kicking off my existence on this platform with a paper release 🔥 We propose a framework for the quantum-enhanced classical simulation of small expectation landscape "patches". In short: You can do more classically than you might have thought. scirate.com/arxiv/2411.1... #quantum