iiinova — where your digital self keeps evolving

Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 01/10/2026

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

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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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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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 27/09/2026

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

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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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 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 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 08/09/2026

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

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 06/09/2026

bei meiner Mutter sind 🫶🙋‍♀️🫂 auch immer hoch im Kurs 😅

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Karthik Ram @karthik.io · 06/09/2026

Today's vibe

A cartoon character tired of Zoom calls, ready to go recharge in nature

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 05/09/2026

Und auch diese Mär von wegen "Mathe ist ja so kompliziert und ich bin zu dumm dafür", das ist auch Blödsinn und muss aufhören. MMn hatten 99% der Leute mit dieser Meinung einfach nur schlechte Erfahrungen in der Schule bzw schlechte Lehrer!

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 02/09/2026

arXiv submission statistics for the quant-ph channel for the last 5 years, 2 years, 6 months.

Plot of the arXiv submissions to the quant-ph channels in the last 5 years.

Plot of the arXiv submissions to the quant-ph channels in the last 2 years.

Plot of the arXiv submissions to the quant-ph channels in the last 6 months.

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 18/08/2026

From the article: "The computer-assisted proof of such a long-standing problem was welcomed with enthusiasm by some, and with unease and disappointment by many, but was rejected outright by others who did not accept mathematical arguments that could not be checked by hand."

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Felix Leditzky 🏳️‍🌈🏳️‍⚧️ @felixled.bsky.social · 18/08/2026

A brief history of the Four-Color Theorem, eventually proved by Appel and Haken in the late 70s at #UIUC in one of the first (?) computer-assisted proofs. www.ams.org/journals/not...

ams.org

AMS :: Notices of the American Mathematical Society

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Mark M. Wilde @markwilde.bsky.social · 15/08/2026

AI sloppers, they ain't scholars, just faking it Forcing youth away from the truth, they ain't making it The kids of today should defend themselves against GPT Emptying minds with empty lies gotta make you laugh Tech-bro vendors buying true defenders of the math

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