You also need to be careful about normalization. Computing operator quantities (e.g. OTOCs) work nicely. But just vanilla expectation values incur an exponential overhead in precision because when vectorizing an observable to run on a QC you need to normalize it to make it a genuine state.
Hey, we have new quantum algs for computing operator hydrodynamic quantities (otocs, magic, etc)
The trick is that these quantities are naturally computed in the Heisenberg picture but we can turn them to states via vectorization
Also @shaohenc.bsky.social's new here & you should follow him!
🧵👇
Last call for abstracts! Join us for Quantum Information by the beach in Thailand ⚛️ 🏖️🇹🇭
The 2nd International Conference on Siam Quantum Science and Technology (SQST 2026), happening May 18 – 21, 2026, in beautiful Jomtien, Chonburi, Thailand! 🌊
🔗Abstract Submission& Further Info: www.sqst2026.org
Oh that's an easy one. Accepted.
God knows if/when I'll next manage to get QIP talk.
But if I do... finding and wearing those trousers will comparitively be a walk in the park.
My group are training for our debut in 2030...
We've studied iterative strategies for finding ground states
We use the ground state of an easy Hamiltonian to `warm start' finding the ground states for some harder Hamiltonians
We derive gradient guarantees that (as for adiabatic methods) depend on the gap and a few other natural properties
🧵👇
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
🧵👇
Every week you get a new chance to finish your paper by the end of the week.
Stefan Knecht has written up a nice summary of Garnet Chan's new paper
"No, FeMoCo hasn’t been entirely solved but for its gold-standard active space model (the model QC folks have been looking at), there is now a classical benchmark which provides an excellent baseline for any quantum work."
🧵👇
If you're interested in joining (and are lacking the cash 💲) you can apply for funding here:
survey.alchemer.com/s3/8557220/O....
Deadline Jan 31st
The Fields Institute (Toronto) has this summer a "Thematic Program on Optimal Transport in Natural Sciences and Statistics"
I see this as a chance for quantum folk to chat with optimal transport experts to see if it could help them e.g. understand trainability questions or develop new quantum algs.
Congrats to the winners:
🥇Maxime Pralong
🥈Jonas Patrick Favre
🥉Titouan Nathan Bertin
(Who asked to have their moment of glory immortalized in the photo below)
And finally in first place…. 🥁
🏆 An ultra nerdy and original gaming/group&rep theory meme 🏆
(Don’t worry if it takes you a while to get — squinting at it on my phone at 11pm the night before my lecture I was also a bit baffled)
🥈In second place we then had a thought provoking analysis on the measurement problem…
are they correct to make the fire quantum mechanics and the child the measurement problem or should it be the other way around? 🤔
🥉In third place we then have this Fermion Boson joke
I’ll concede that my group actually voted it to second place but as meme dictator I down voted it on the basis that fermion boson jokes are old hack (at least in my circles)
Then in 4th place a nicely educational meme that will be added to my notes…
It only didn’t appear higher because they forgot to include spiderbaby and spidercat
And the results of the annual Quantum Physics 2 meme competition are in… 🥁 🪘🛢️🍗
in fifth place we have a meme that I secretly have a lot of sympathy for…
There's a higher probability that we'll end up talking about exponentials
I partially took inspiration from you - I know you've always enjoyed hosting your group at your place :)
I also clearly consumed enough fine wine to have forgotten English today.
Not `persued'. I guess `pursued'. Or `ensued'. 😶🌫️
I made the bold decision to host my group's Christmas dinner/party
Chaos persued
'Team cooking' arranged a four course meal featuring a whole salmon, capon, lamb shoulder and countless sides/desserts.
Followed by crackers, secret santa and slide karaoke
Miraculously only one glass was broken
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! 🚀
Happy to share our paper: Leveraging Symmetry Merging in Pauli Propagation
scirate.com/arxiv/2512.1...
tl;dr We improve standard Pauli propagation by merging Pauli strings related by symmetry.
Shoutout to my collaborators @sueyeonchung.bsky.social @quantummanuel.bsky.social @qzoeholmes.bsky.social
Credit to these new guarantees go to the brilliant @joachimfavre.bsky.social (who did this during his summer project at Algorithmiq and, fyi / hint hint, is currently looking for a PhD).
Check out the new version here: arxiv.org/abs/2503.18939
Hey we've just updated the arXiv version of our Majorana propagation paper
We now have end-to-end efficiency guarantees for a randomized model of an adaptVQE-like circuit
(Our error bounds here are way tighter than the ones for pauli prop and also use a new Markov chain based proof strategy)
Please accept my sincere apologies for this notation.
(Though I also challenge you to come up with anything less headache inducing in this context).
I don’t really know what you mean by ’best randomness’ but your intuition is probably in the right direction.
So we shook hands, agreed and lived happily ever after
Oh and we also derived a shit tonne of expressions for moments of channel ensembles - so if you ever need these you know where to look!
Thanks for the (heated) project @mduschenes.bsky.social @dgarciamartin.bsky.social @mvscerezo.bsky.social
