Francesco Buscemi
@quantumquia.com
Quantum physicist with a focus on the fundamental aspects of the theory. Blog at www.quantumquia.com
Can I call them quantum panini relative entropies instead of sandwiched?
November 15, 2025 at 4:07 AM
Can I call them quantum panini relative entropies instead of sandwiched?
New blog post about the quantum Bayes rule paper, joint work with with Ge Bai and @valerioscarani.bsky.social
quantumquia.com/2025/10/08/b...
quantumquia.com/2025/10/08/b...
Bayes’ Rule Goes Quantum
Bayes’ rule is often introduced in textbooks through examples involving urns filled with colored balls. It is striking, however, that the same formula works just as well in situations totally…
quantumquia.com
October 8, 2025 at 1:56 AM
New blog post about the quantum Bayes rule paper, joint work with with Ge Bai and @valerioscarani.bsky.social
quantumquia.com/2025/10/08/b...
quantumquia.com/2025/10/08/b...
Whenever I see the scoring letters "SABC," I read "soprano, alto, tenor, bass" instead.
September 5, 2025 at 6:04 AM
Whenever I see the scoring letters "SABC," I read "soprano, alto, tenor, bass" instead.
Reposted by Francesco Buscemi
Tomorrow will be Cornell Information Theory Day, with program available here:
find.engineering.cornell.edu/cornell-info...
Book of abstracts here:
find.engineering.cornell.edu/files/2025/0...
find.engineering.cornell.edu/cornell-info...
Book of abstracts here:
find.engineering.cornell.edu/files/2025/0...
Cornell Information Theory Day – Fall 2025 | FIND
find.engineering.cornell.edu
September 5, 2025 at 1:08 AM
Tomorrow will be Cornell Information Theory Day, with program available here:
find.engineering.cornell.edu/cornell-info...
Book of abstracts here:
find.engineering.cornell.edu/files/2025/0...
find.engineering.cornell.edu/cornell-info...
Book of abstracts here:
find.engineering.cornell.edu/files/2025/0...
MDPI are running out of nouns in the English dictionary for the titles of their journals
September 4, 2025 at 7:38 AM
MDPI are running out of nouns in the English dictionary for the titles of their journals
After about two decades of friendship, I now realize that there's a "Nicholas" between "Jeremy" and "Butterfield."
arxiv.org/abs/2505.23639
arxiv.org/abs/2505.23639
The Multiverse: a Philosophical Introduction
This book is a philosopher's introduction to the idea that our universe is just one of many universes. I present and assess three versions of the idea: one version from philosophy, and two from physic...
arxiv.org
May 30, 2025 at 3:09 AM
After about two decades of friendship, I now realize that there's a "Nicholas" between "Jeremy" and "Butterfield."
arxiv.org/abs/2505.23639
arxiv.org/abs/2505.23639
I received this email from Scipost and thought I would share it here. It's an open letter to the scientific community asking for help to keep Scipost alive and sustainable. (It's a bit long, so I'm sharing it as a public link in my Evernote).
share.evernote.com/note/dc4f9e1...
share.evernote.com/note/dc4f9e1...
Evernote
share.evernote.com
May 16, 2025 at 11:05 PM
I received this email from Scipost and thought I would share it here. It's an open letter to the scientific community asking for help to keep Scipost alive and sustainable. (It's a bit long, so I'm sharing it as a public link in my Evernote).
share.evernote.com/note/dc4f9e1...
share.evernote.com/note/dc4f9e1...
Reposted by Francesco Buscemi
May 15, 2025 at 8:06 AM
Reposted by Francesco Buscemi
I'm a huge fan and an active user of the hyperref and cleveref LaTeX packages, but unfortunately it looks like they are no longer compatible (and cleveref is not actively maintained).
github.com/latex3/hyper...
Any suggestions for cleveref alternatives? (Or anyone able to maintain it...?)
github.com/latex3/hyper...
Any suggestions for cleveref alternatives? (Or anyone able to maintain it...?)
`cleveref` now refers to appendices as sections · Issue #362 · latex3/hyperref
Using hyperref 2024-11-05 v7.01l with LaTeX 2024-11-01 and the example file: \documentclass{article} \usepackage{hyperref} \usepackage{cleveref} \begin{document} \cref{sec:one} and \cref{sec:a} \se...
github.com
May 12, 2025 at 2:15 PM
I'm a huge fan and an active user of the hyperref and cleveref LaTeX packages, but unfortunately it looks like they are no longer compatible (and cleveref is not actively maintained).
github.com/latex3/hyper...
Any suggestions for cleveref alternatives? (Or anyone able to maintain it...?)
github.com/latex3/hyper...
Any suggestions for cleveref alternatives? (Or anyone able to maintain it...?)
Reposted by Francesco Buscemi
HISTORY OF PHYSICS
On fear, by Paul Dirac.
I would like to refer particularly to Lorentz.
Any of you who have studied relativity must surely have wondered why it was that Lorentz succeeded in getting correctly all the basic equations needed to establish
1/
On fear, by Paul Dirac.
I would like to refer particularly to Lorentz.
Any of you who have studied relativity must surely have wondered why it was that Lorentz succeeded in getting correctly all the basic equations needed to establish
1/
May 10, 2025 at 3:13 PM
HISTORY OF PHYSICS
On fear, by Paul Dirac.
I would like to refer particularly to Lorentz.
Any of you who have studied relativity must surely have wondered why it was that Lorentz succeeded in getting correctly all the basic equations needed to establish
1/
On fear, by Paul Dirac.
I would like to refer particularly to Lorentz.
Any of you who have studied relativity must surely have wondered why it was that Lorentz succeeded in getting correctly all the basic equations needed to establish
1/
I finally got my hands on Lanczos' "The Variational Principles of Mechanics". I'm very excited to dive into it!
April 29, 2025 at 11:11 AM
I finally got my hands on Lanczos' "The Variational Principles of Mechanics". I'm very excited to dive into it!
Two things bothered me when discussing "quantum non-Markovianity". First, that there was no way to exclude classical processes. Second (but related to the first), that a simple mixture of two Markov processes could turn out to be non-Markovian.
April 23, 2025 at 10:36 PM
Two things bothered me when discussing "quantum non-Markovianity". First, that there was no way to exclude classical processes. Second (but related to the first), that a simple mixture of two Markov processes could turn out to be non-Markovian.
Reposted by Francesco Buscemi
Let's see what happens if I spoof the article metadata from the backend...
www.bbc.co.uk/news/article...
www.bbc.co.uk/news/article...
Elon Musk sent to Guantanamo after his Cybertruck explodes outside White House | BBC News
Tesla stock jumps 250% on news that Musk would be unable to run the company from his cell
www.bbc.co.uk
March 5, 2025 at 10:40 PM
Let's see what happens if I spoof the article metadata from the backend...
www.bbc.co.uk/news/article...
www.bbc.co.uk/news/article...
Since I gave an overview presentation on the Petz transpose map in 2021, we've learned a lot more about its interpretation and relation to Bayesian inversion. The most important, in my opinion, is the derivation of the Petz transpose map from a principle of minimum change.
youtu.be/8ZzGI7hYAfU
youtu.be/8ZzGI7hYAfU
The Petz map in maths, information theory, and physics: an overview
YouTube video by Francesco Buscemi
youtu.be
April 22, 2025 at 1:19 AM
Since I gave an overview presentation on the Petz transpose map in 2021, we've learned a lot more about its interpretation and relation to Bayesian inversion. The most important, in my opinion, is the derivation of the Petz transpose map from a principle of minimum change.
youtu.be/8ZzGI7hYAfU
youtu.be/8ZzGI7hYAfU
Meta asked me for permission to use my posts to train their AI, with the option to opt out. That's because I was in Italy when I opened my account. Outside the EU you CANNOT opt out and Meta will effectively steal your memories to feed their LLMs. In those moments I think: Thank God I'm European.
April 19, 2025 at 7:25 AM
Meta asked me for permission to use my posts to train their AI, with the option to opt out. That's because I was in Italy when I opened my account. Outside the EU you CANNOT opt out and Meta will effectively steal your memories to feed their LLMs. In those moments I think: Thank God I'm European.
Introducing our resource theory of microscopicity: a unifying framework where macroscopic entropy meets Bayesian retrodiction, Petz recovery maps, quantum coherence, athermality, etc. Everything can be understood as "inferential asymmetry" or "irretrodictability".
arxiv.org/abs/2504.12738
arxiv.org/abs/2504.12738
Macroscopic states and operations: a generalized resource theory of coherence
To understand the emergence of macroscopic irreversibility from microscopic reversible dynamics, the idea of coarse-graining plays a fundamental role. In this work, we focus on the concept of macrosco...
arxiv.org
April 18, 2025 at 10:24 AM
Introducing our resource theory of microscopicity: a unifying framework where macroscopic entropy meets Bayesian retrodiction, Petz recovery maps, quantum coherence, athermality, etc. Everything can be understood as "inferential asymmetry" or "irretrodictability".
arxiv.org/abs/2504.12738
arxiv.org/abs/2504.12738
Reposted by Francesco Buscemi
Does anyone have a PDF of this reference?
R.S. Ingarden, H. Janyszek, A. Kossakowski and T.
Kawaguchi, “Information geometry of quantum statistical systems,” Tensor (N.S.) 37 (1982), pp. 105-
111.
Looks like a paper that people cite but google and google scholar don't lead to a PDF
R.S. Ingarden, H. Janyszek, A. Kossakowski and T.
Kawaguchi, “Information geometry of quantum statistical systems,” Tensor (N.S.) 37 (1982), pp. 105-
111.
Looks like a paper that people cite but google and google scholar don't lead to a PDF
April 18, 2025 at 10:04 AM
Does anyone have a PDF of this reference?
R.S. Ingarden, H. Janyszek, A. Kossakowski and T.
Kawaguchi, “Information geometry of quantum statistical systems,” Tensor (N.S.) 37 (1982), pp. 105-
111.
Looks like a paper that people cite but google and google scholar don't lead to a PDF
R.S. Ingarden, H. Janyszek, A. Kossakowski and T.
Kawaguchi, “Information geometry of quantum statistical systems,” Tensor (N.S.) 37 (1982), pp. 105-
111.
Looks like a paper that people cite but google and google scholar don't lead to a PDF
I'll say it again: federatable does not mean federated. Bluesky is by design (a central, non-bypassable node) required to comply with all requests, including those of a censorship nature. mas.to/@osma/114346...
Osma A 🇫🇮🇺🇦 (@osma@mas.to)
Attached: 1 image
Bluesky didn't reach a federated stage where you could choose a service provider in a free country before they started to censor people based on authoritarian demands.
mas.to
April 17, 2025 at 12:40 PM
I'll say it again: federatable does not mean federated. Bluesky is by design (a central, non-bypassable node) required to comply with all requests, including those of a censorship nature. mas.to/@osma/114346...
Reposted by Francesco Buscemi
This past week, I received a second stop work order on one of my grants. This now means that we can no longer spend on *two* of my major grants. Several of my group members will now graduate earlier than expected, I am looking into being a consultant for the summer, and students will do internships
April 12, 2025 at 10:37 AM
This past week, I received a second stop work order on one of my grants. This now means that we can no longer spend on *two* of my major grants. Several of my group members will now graduate earlier than expected, I am looking into being a consultant for the summer, and students will do internships
Reposted by Francesco Buscemi
18 years ago like today I left Geneva to take up the job that is still mine. Celebrating with my group, and thinking of all the amazing people I got to meet.
April 10, 2025 at 6:10 AM
18 years ago like today I left Geneva to take up the job that is still mine. Celebrating with my group, and thinking of all the amazing people I got to meet.
THIS!
Those trying to understand the tariffs as economic policy are dangerously naive.
No, the tariffs are a tool to collapse our democracy. A means to compel loyalty from every business that will need to petition Trump for relief.
1/ A 🧵 to explain his plan and how we fight back.
No, the tariffs are a tool to collapse our democracy. A means to compel loyalty from every business that will need to petition Trump for relief.
1/ A 🧵 to explain his plan and how we fight back.
April 3, 2025 at 11:10 AM
THIS!
Today begins my one-year term as department head. 😑 Wish me good luck... 😬
March 31, 2025 at 11:58 PM
Today begins my one-year term as department head. 😑 Wish me good luck... 😬
Reposted by Francesco Buscemi
