Quantum physicist with a focus on the fundamental aspects of the theory. Blog at www.quantumquia.comhttps://bsky.app/profile/quantumquia.comhttps://bsky.app/profile/quantumquia.com/post/3mqodv7dyfs2jI 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: https://filedn.eu/lXy2qI8qrfTHFvGxYFjfGmh/arxiv-launcher.html Use it online, save it locally, remix it, whatever works.15 Jul 2026 08:53 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3mqodv7dyfs2jhttps://bsky.app/profile/quantumquia.com/post/3mpuf6dkjwk26A 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?05 Jul 2026 01:07 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3mpuf6dkjwk26https://bsky.app/profile/quantumquia.com/post/3mjlq6jg4rc2xI 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.16 Apr 2026 05:59 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3mjlq6jg4rc2xhttps://bsky.app/profile/quantumquia.com/post/3ma3wf4mgd22fNew blog post. This is about macroscopicity and "inferential reference frames". https://quantumquia.com/2025/12/16/what-does-macroscopic-really-mean-in-quantum-theory/16 Dec 2025 10:21 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3ma3wf4mgd22fhttps://bsky.app/profile/quantumquia.com/post/3m7tjkiv4ac2mI 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.13 Dec 2025 02:10 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3m7tjkiv4ac2mhttps://bsky.app/profile/quantumquia.com/post/3m5nczsm4gk22Can I call them quantum panini relative entropies instead of sandwiched?15 Nov 2025 04:07 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3m5nczsm4gk22https://bsky.app/profile/quantumquia.com/post/3m2njzeyscs2oNew blog post about the quantum Bayes rule paper, joint work with with Ge Bai and @valerioscarani.bsky.social https://quantumquia.com/2025/10/08/bayes-rule-goes-quantum/08 Oct 2025 01:56 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3m2njzeyscs2ohttps://bsky.app/profile/quantumquia.com/post/3ly2yhgmbqc22Whenever I see the scoring letters "SABC," I read "soprano, alto, tenor, bass" instead.05 Sep 2025 06:04 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3ly2yhgmbqc22https://bsky.app/profile/quantumquia.com/post/3lxynbx5ctc2dMDPI are running out of nouns in the English dictionary for the titles of their journals04 Sep 2025 07:38 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3lxynbx5ctc2dhttps://bsky.app/profile/quantumquia.com/post/3lqeaz43b3s2vAfter about two decades of friendship, I now realize that there's a "Nicholas" between "Jeremy" and "Butterfield." arxiv.org/abs/2505.23639 https://arxiv.org/abs/2505.2363930 May 2025 03:09 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3lqeaz43b3s2vhttps://bsky.app/profile/quantumquia.com/post/3lpd5cqwddk2bI 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). https://share.evernote.com/note/dc4f9e1f-ef78-f918-a6d8-007ba6f95cc416 May 2025 23:05 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3lpd5cqwddk2bhttps://bsky.app/profile/quantumquia.com/post/3lohltqqags2sForer's statements, psychic cons, and AI https://softwarecrisis.dev/letters/llmentalist/06 May 2025 00:10 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3lohltqqags2shttps://bsky.app/profile/quantumquia.com/post/3lnx5jbuqek2dI finally got my hands on Lanczos' "The Variational Principles of Mechanics". I'm very excited to dive into it!29 Apr 2025 11:11 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3lnx5jbuqek2dhttps://bsky.app/profile/quantumquia.com/post/3lnjaxv4e7c26Two 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.23 Apr 2025 22:36 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3lnjaxv4e7c26https://bsky.app/profile/quantumquia.com/post/3lnej4zr42k2bSince 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 https://youtu.be/8ZzGI7hYAfU22 Apr 2025 01:19 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3lnej4zr42k2bhttps://bsky.app/profile/quantumquia.com/post/3ln5m6fpyo22kMeta 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.19 Apr 2025 07:25 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3ln5m6fpyo22khttps://bsky.app/profile/quantumquia.com/post/3ln3fpsepyk2kIntroducing 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 https://arxiv.org/abs/2504.1273818 Apr 2025 10:24 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3ln3fpsepyk2khttps://bsky.app/profile/quantumquia.com/post/3lmz4usjp622kI'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. https://mas.to/@osma/11434616689055247117 Apr 2025 12:40 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3lmz4usjp622khttps://bsky.app/profile/quantumquia.com/post/3llvrdjxrt22wTHIS! [contains quote post or other embedded content]03 Apr 2025 11:10 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3llvrdjxrt22whttps://bsky.app/profile/quantumquia.com/post/3llpksmt37c2kToday begins my one-year term as department head. 😑 Wish me good luck... 😬31 Mar 2025 23:58 +0000at://did:plc:jvxjgp2eqhuvmlgdelcdum2c/app.bsky.feed.post/3llpksmt37c2k