iiinova — where your digital self keeps evolving

Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 17h

academicjobsonline.org is doing it the right way 👏👏👏

Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 14/10/2026

Reference letter system admins of the world, please make it easy for us to check that we uploaded the right letter for the right job 🙏

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 13/10/2026

"If an expert prompts a result, they take up the mantle of responsibility I describe above [of explaining what you did, what is new vs. well-known, and nurturing the literature]. OpenAI not only refuses to take their responsibility, but they prevent their own customers from doing so." 🎯💯👏

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 13/10/2026

Milwaukee is awesome, my wife and I just spent the weekend there for a show, we keep going back

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 12/10/2026

Check out this thread on Reddit: www.reddit.com/r/math/comme...

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 10/10/2026

"Having reached the age of 103, Fred puts his long life down to luck, whiskey and stopping smoking in 1963." 😂

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Nicholas Jackson @njj4.bsky.social · 10/10/2026

It's an academic DoS attack. Also it feels like OpenAI have burst in through the door and said "hey, I finished all those jigsaw puzzles you were doing - you're welcome!"

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Maris Ozols @marisozols.bsky.social · 09/10/2026

You may finally rest easy at night since SICs exist in all dimensions! github.com/marozols/SIC... SICs are d² unit vectors in d complex dimensions with pairwise equal inner products. Their existences in all dimensions d was conjectured by Zauner in 1999. en.wikipedia.org/wiki/SIC-POVM

Diagram illustrating Lean proof of SIC existence

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 07/10/2026

Communications in Mathematical Physics: link.springer.com/journal/220/...

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Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 07/10/2026

Where is the understanding in any of this?

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Phil PlAIt @philplait.bsky.social · 06/10/2026

Congratulations to this year's winner of the Physics Nobel Prize!

Rapper Ice Cube wearing a baseball hat against a red background. Trillions of neutrinos are passing through him (not shown).

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Katie Mack @astrokatie.com · 06/10/2026

What is the IceCube neutrino observatory? Neutrinos are elusive particles that rarely interact, but can create flashes of light when they do. Most neutrino detectors are giant water tanks surrounded by light detectors. IceCube is kilometer-long strings of detectors embedded in the Antarctic ice.

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

I'm really worried this is already the norm for most people...

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arXiv @arxiv.bsky.social · 01/10/2026

arXiv has updated our policy on rate limiting for all submitters. This update was made to fairly distribute moderator time & support the arXiv community of staff, volunteers, readers & authors. Please read our announcement to learn more: blog.arxiv.org/2026/10/01/updated-r…

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

We analyze optimal data hiding schemes based on multipartite Werner states under PPT measurements, using the representation-theoretic framework of mixed Schur-Weyl duality. scirate.com/arxiv/2609.4...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

We investigate constructions of exact unitary designs under symmetry constraints that reflect physical limitations in quantum devices. scirate.com/arxiv/2609.4...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

We study the compatibility of measurements, quantum channels and quantum instruments using techniques from operator space theory. scirate.com/arxiv/2609.4...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

We recast the sample complexity of k-copy quantum state discrimination as a quantum mixing time problem that becomes fully classical under suitable (and natural) symmetries, with applications to e.g. learning phase states and hypergraph states. scirate.com/arxiv/2609.4...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

We use representation theory to understand IID depolarizing channels as Gaussian channels in a suitable limit, which yields a substantial improvement on the best lower bound on the quantum capacity threshold of the depolarizing channel. scirate.com/arxiv/2609.3...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

Today my group put out 5 new papers in time for the QIP deadline next week! With 221 (!) other papers posted to arXiv.org/quant-ph today, it might be a good idea to try to increase their visibility. I'll mention them sorted alphabetically by title (and might add little blurbs about each later) 🧵

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

In vielen (den meisten?) Fällen stimmen die beiden aber überein, oder?

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

This was a very productive collaboration between UIUC (Sujeet and me) and @quantumiqc.bsky.social @uwaterloo.ca (the other authors).

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

"Tight Universal Bounds on Quantum Data Hiding with Multipartite Werner States" with Oren Akresh and Jacob Beckey scirate.com/arxiv/2609.4...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

"Randomness of exact unitary designs under symmetry" with Christopher Vairogs scirate.com/arxiv/2609.4...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

"Compatibility of quantum instruments" with Haneul (Chloe) Kim, Yujie Zhang, Eric Chitambar, and Marius Junge scirate.com/arxiv/2609.4...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

"A mixing time method for estimating the sample complexity of quantum state discrimination" with Juntai (Stephen) Zhou scirate.com/arxiv/2609.4...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

"A depolarizing choir sings in Gaussian harmony" with Rabsan Galib Ahmed (@ahmed-rabsan.bsky.social), Sujeet Bhalerao, Sungjai Lee, Debbie Leung (@debbie-leung-q.bsky.social), Luke Schaeffer, and Graeme Smith (@graemesmith.bsky.social). scirate.com/arxiv/2609.3...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 01/10/2026

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Graeme Smith @graemesmith.bsky.social · 28/09/2026

Shame on @qipconference.bsky.social for using X/twitter. You give our community a bad name.

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Reposted by Felix Leditzky 🏳️‍🌈🏳️‍⚧️

Jeffrey Shallit 🇺🇦 @shallit.bsky.social · 18/09/2026

A new risk for mathematicians: a colleague reports that immediately after they posted an abstract of their upcoming talk online, a student elsewhere used AI to derive proofs of the stated results and then posted it on the arxiv. My colleague hadn't posted to arxiv yet. Scummy. Watch out.

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 27/09/2026

It is nevertheless a "TV show of the 21st century" IMO

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 27/09/2026

Sopranos is not listed because it started in 1999?

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Katie Mack @astrokatie.com · 23/09/2026

Good morning from @perimeterinstitute.bsky.social ! ☀️

A chalkboard on an outdoor wall next to a reflecting pool, with chairs and a sofa in front of the wall. In chalk, there is a drawing of the institute and the words “Welcome to Perimeter. Discovery starts with curiosity.”

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 19/09/2026

Thanks! My wife and I are about to move to Chicago (Avondale/Logan Square area) and we're excited to explore food and bars.

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 17/09/2026

Yes, it's nice up there :-) if you get a chance, check out the orchards! The library and chapel are also nice to see.

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 15/09/2026

New work "High quantum local differential privacy breaks entanglement" led by my student Sujeet Bhalerao and postdoc Theshani Nuradha! We study the interplay of local differential privacy and entanglement, and implications for learning theory in the private setting. scirate.com/arxiv/2609.1...

scirate.com

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 10/09/2026

I don't see how this wouldn't heavily favor established, senior people in the field over early-career researchers.

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Dmitry Grinko @dmitry-grinko.bsky.social · 08/09/2026

One could try to explain Navier-Stokes drama via hypothesis that Levent or Tristan did not properly turn off data-sharing in ChatGPT. It is not enough to turn off "Improve the model for everyone" in Data controls settings, you need to submit it via "Privacy center". 1/3

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixleditzky.info · 08/09/2026

Caution should be applied when using LLMs in your research. This story is wild.

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