I never got used to the new arXiv search interface. Let's just say my brain stopped accepting UI updates sometime around 2015. 😅 So I asked an LLM to make me a simple search launcher instead: filedn.eu/lXy2qI8qrfTH... Use it online, save it locally, remix it, whatever works.

A paper we submitted to J Math Phys has been sitting idle on the editor's desk for 66 days. No reply to our inquiries. Is this to be considered the new normal?

I was saddened to hear of Michael Hall's passing. Over the years he offered me both encouragement and thoughtful scientific advice, most recently last December. A great scientist and a rare model of kindness and integrity in academia, he will be greatly missed.

New blog post. This is about macroscopicity and "inferential reference frames". quantumquia.com/2025/12/16/w...

What does “macroscopic” really mean in quantum theory?

One of the persistent difficulties in discussing the emergence of macroscopic irreversibility from microscopic quantum dynamics is that we often talk about “macroscopic states”, “macroscopic operat…

quantumquia.com

I just received a paper for a Springer journal that was obviously LLM-generated, complete with non-existent theorems, missing proofs, and hallucinated references. The journal has double-blind review. You see the problem? Stone thrown, hand hidden. No one to name-shame.

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...

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

Whenever I see the scoring letters "SABC," I read "soprano, alto, tenor, bass" instead.

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...

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

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

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...

Refs : - clintel.org/nobel-prize-... - co2coalition.org/publications...

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...?)

`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

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/

Forer's statements, psychic cons, and AI softwarecrisis.dev/letters/llme...

The LLMentalist Effect: how chat-based Large Language Models rep…

The new era of tech seems to be built on superstitious behaviour

softwarecrisis.dev

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.

Let's see what happens if I spoof the article metadata from the backend... 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

bbc.co.uk

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

The Petz map in maths, information theory, and physics: an overview

YouTube video by Francesco Buscemi

youtu.be

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

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

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

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

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

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!

Chris Murphy@chrismurphyct.bsky.social · last yr.

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.

Today begins my one-year term as department head. 😑 Wish me good luck... 😬

Beyond IID 13 Submission deadline has been extended to April 6! sites.google.com/view/beyondi...

beyondiid13 - Call for submissions

Summary data: Submission server: https://easychair.org/conferences/?conf=biid13 Format: Extended abstract (up to 3 pages excl. references) AND (arXiv link to OR copy of) full manuscript Deadline: 31 M...

sites.google.com