@superposedp.bsky.social
Noisy, Chaotic and Quantum doctoral Researcher at Uni.lu.
New paper today! Very excited to announce we obtain, from first principles, a quantum master equation that both applies in the many-body regime and provably converges to the exact Gibbs state: arxiv.org/abs/2505.20064
27.05.2025 09:04 — 👍 20 🔁 2 💬 1 📌 0
“My deep and abiding feeling is that if you look at anything closely enough, there will be new riches to be found.” — Sidney Nagel, physicist at the University of Chicago
13.05.2025 20:04 — 👍 28 🔁 7 💬 1 📌 0
Today on things to do instead of writing the thesis:
Plot a noisy version of the butterfly curve
Indeed, when you consider more complicated setups like GP, or Continuous Measurements, you get equations that are nonlinear in the state. What puzzles me is that you can get nonlinear equations for operators even in standard QM
10.12.2024 13:09 — 👍 0 🔁 0 💬 0 📌 0I'm thinking in standard QM in the Heisenberg picture where an observable O evolves with Heisenberg's equation dO/dt = i [H, O] which can be nonlinear in the observable (e.g. if H has terms like σzσz the eq for σx will have a term σzσy and so on)
10.12.2024 13:02 — 👍 1 🔁 0 💬 0 📌 0
I think the reference where I learned about this was the original paper by Haake et al link.springer.com/article/10.1... in there the quantum equations of motion for observables are nonlinear, and so is the map they find in the classical limit.
10.12.2024 12:52 — 👍 1 🔁 0 💬 1 📌 0I always found this argument a bit confusing. QM is linear in the state but you can also write CM as a linear equation on the phase space density using Poisson brackets. On the contrary, if you write the Heisenberg eq. for the evolution of an operator in QM you can get a nonlinear equation, as in CM
10.12.2024 07:48 — 👍 3 🔁 0 💬 3 📌 0In the spirit of friendly academic shit posting...
(Or because we lack imagination?)
We picked another IBM experiment to benchmark our small-angle Pauli propagation alg.
This time: arxiv.org/abs/2404.08053
@quantummanuel.bsky.social's plot below is for TFI on 127 qubits in a heavy hex topology
A section of a highly colourful plot, made up of many small coloured dots. In various spots, dense & regular concentric circles of different colours can be seen, surrounded by regions which appear more chaotic with many dots of different colours interleaving. Smaller circular (and less circular) regions can also be seen in between the larger ones, as well as on the edges of the large rings. The white background is barely visible.
Who says that physics can’t also be art?
This was shared by a colleague in a seminar this morning - see if you can guess what it depicts!
🧪⚛️ #physics #quantum #SciArt
Thank you for doing this! I'd like to be included in the list✨
22.11.2024 06:47 — 👍 0 🔁 0 💬 1 📌 0I feel that physicists and astronomers don’t openly talk about the importance of good writing in creating a successful arXiv paper, especially for theorists. Yes the science matters but you gotta get people to read your pet theory!
More generally cultivating writing skills helps a lot!
🧪🔭⚛️
