Felix Leditzky πŸ³οΈβ€πŸŒˆπŸ³οΈβ€βš§οΈ

Felix Leditzky πŸ³οΈβ€πŸŒˆπŸ³οΈβ€βš§οΈ

@felixled.bsky.social

Assistant Professor at University of Illinois Math | Quantum information theorist | In a superposition of Central Illinois and St Louis | Vienna native | (he/him)

673 Followers 521 Following 245 Posts Joined Jul 2023
2 days ago
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RIP Tony Leggett It's been an extremely busy time, and there are all kinds of distressing events afoot.Β  Talking about new science results or the funding sit...

πŸ§ͺβš›οΈ Brief thoughts on the passing of Tony Leggett, an outstanding theoretical physicist with a lasting impact across multiple topics. nanoscale.blogspot.com/2026/03/rip-...

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1 week ago
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www.reddit.com/r/Programmer...

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1 week ago

Mail them to my home instead πŸ™

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2 weeks ago

Just in time for Quantum's 10th anniversary, our paper "Localizing multipartite entanglement with local and global measurements" with students Chris Vairogs and Sam Hermes has been published in Quantum πŸ₯³ Huge congrats to Chris and Sam!

quantum-journal.org/papers/q-202...

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2 weeks ago

10 years after its founding, driven by the energy, enthusiasm, & dedication of the community @quantum-journal.bsky.social quietly published paper #2000 some days ago.

At least I think this is a big deal, big shout out to the founders & all authors, reviewers, editors, board members & contributors!

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3 weeks ago

Was TCing Gabriel a mistake... Maybe.
Could it have been worse... Definitely!

P.S.: As a Gunner, I'm just really mad about today's game.

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3 weeks ago

I think large parts of this sentiment apply to STEM as well.

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3 weeks ago

It’s going to sound quaint, but the best way to resist an AI takeover of the humanities is to assign physical books, sit around, read them, and argue about ideas. Academic has become such a competitive arena, that we ourselves are trained to look for the winning angle, instead of the best education.

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3 weeks ago
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2026 Fellows | Alfred P. Sloan Foundation Our mission is to make the world a better place through the advancement of scientific knowledge.

QIS Sloan Fellowships for Anand Natarajan, John Wright, Jake Covey (UIUC) and Isaac Kim, and a non-QIS Sloan for fellow UIUC math member Ben Castle. Congrats!!

sloan.org/fellowships/...

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3 weeks ago

Always made me wonder. I guess the geometric nature of GR and the nice pictures people use to explain it have more appeal than a bunch of psi's 🀣

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3 weeks ago

I remember my student times when these crackpots (always older men) would sit through a lecture, to then start yelling how Einstein was wrong, relativity is bullshit, and holding up their handwritten signs and sheets of paper. It was always about gravity, and never about quantum mechanics.

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3 weeks ago
four stick figures on sleds, one is sliding face first, face down, marked "skeleton", diagonally opposite to it is one sliding feet first, face up, marked "luge". The other two combinations are drawn and labeled with question marks

given the existence of skeleton and luge, i postulate the existence of two other, yet to be discovered, winter olympic sports

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3 weeks ago

I had a mini disc player (stereo at home and portable)

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3 weeks ago
Postdoctoral Researcher, Quantum Many-Body Theory and Quantum Computation Job Description Summary Organization's Summary Statement: This position is available within the University of Maryland’s Division of Information Technology (DIT). The National Quantum Laboratory (QLab...

New many-body postdoc offering at @UMDscience; come join us! umd.wd1.myworkdayjobs.com/UMCP/job/Uni...

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1 year ago
A scrawled bit of barely legible cursive handwriting that reads "But I am very poorly today & very stupid & hate everybody & everything."

"But I am very poorly today & very stupid & hate everybody & everything. One lives only to make blunders."

Charles Darwin, who had a pretty bad day every now and then, was born #OTD in 1809. πŸ§ͺ

The letter to Charles Lyell with the quote above:
www.darwinproject.ac.uk/letter?docId...

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3 weeks ago

Many thanks to Theshani and Sujeet for seeing this through! I've learned a lot in the process πŸ€“

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3 weeks ago

Finally, we also consider a private variant of the classical shadows technique to estimate expectation values, identifying settings where this approach gives good protocols.

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3 weeks ago

We then focus on a specific application: estimating the expectation value of an observable w.r.t. a quantum state when only given access to the privatized quantum state. We characterize the sample complexity of this task, for the lower bound by employing private quantum hypothesis testing bounds.

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3 weeks ago

We study privacy-utility tradeoffs in a quantum differential privacy setting.

We first discuss a generic setting and show how depolarizing noise achieves the optimal utility w.r.t. trace distance and fidelity.

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3 weeks ago

New paper "Privacy-Utility Tradeoffs in Quantum Information Processing" with my postdoc Theshani Nuradha and my student Sujeet Bhalerao!

scirate.com/arxiv/2602.1...

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1 month ago
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Approximate Unitary $k$-Designs from Shallow, Low-Communication Circuits Random unitaries are useful in quantum information and related fields, but hard to generate with limited resources. An approximate unitary $k$-design is an ensemble of unitaries with an underlying mea...

It's worth reading the new version (either on CMP or the arXiv at arxiv.org/abs/2407.07876), since we're giving a streamlined and much more readable proof of our main result!

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1 month ago
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Approximate Unitary k-Designs from Shallow, Low-Communication Circuits - Communications in Mathematical Physics Random unitaries are useful in quantum information and related fields, but hard to generate with limited resources. An approximate unitary k-design is an ensemble of unitaries with an underlying measu...

Our paper on approximate unitary designs in logarithmic depth with Nick LaRacuente is now published in Communications in Mathematical Physics!

link.springer.com/article/10.1...

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1 month ago
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My TQC submission.

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1 month ago
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I bury my head in the sand when I see some of these maps

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1 month ago

Yes! hopefully this is the start of a good stretch of competitive seasons

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1 month ago

Unbelievable

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1 month ago

Whaaaaat. OT here we come. This is so stressful

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1 month ago
Handshake meme with Chicago and St Louis bonding over both being against the Rams today.

#GoBears 🐻

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1 month ago
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Open Positions PhD positions Coming soon (Australian student only)- Topic: Blueprint quantum processor with nuclear spin logical qubits in silicon. Postdoc positions Postdoctoral Research Fellow – Rottnest:…

Several postdoc positions to work on quantum computing with Simon Devitt, at UTS: quantumts.org/open-positio...

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1 month ago

The real reason why you need to submit your slides before the start of #QIP2026 is so that during the conference you have time to work on your #TQC2026 submission.

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