Rafael Wagner

I've started a pos-doc at Ulm in the group of Martin Plenio to work on a few topics I'm interested in which are related to quantum resource theories and thermodynamics....

The idea is to apply the resource theoretic toolbox to search for fundamental limitations on QEC, and more broadly FTQC.

Thanks!

Thank you!!

Now under construction: The bridge connecting research on quantum matter and quantum information in the Ginsburg Center @caltech.edu to the high energy theory group in Downs-Lauritsen Laboratory. Exciting!

Thanks :) :) :)

People take for granted the fact that mangos are so delicious, but most don’t know that every logical mango is made out of many physical mangos.

The Paul Ehrenfest Best Paper Award for #Quantum Foundations for 2024 has been awarded to Rainer Verch and Chris Fewster in recognition of their outstanding paper, “Quantum Fields and Local Measurements.”
Congratulations!

Error detection without post-selection in adaptive quantum circuits Current quantum computers are limited by errors, but have not yet achieved the scale required to benefit from active error correction in large computations. We show how simulations of open quantum sys...

Learn more about this discovery in the scientific paper on "Error detection without post-selection in adaptive quantum circuits".

🔬: arxiv.org/abs/2509.25326

Thanks :)

Thank you a lot for all the notes as well! They were very useful for remembering the discussions/comments for the future.

Truly sad indeed. Super missed!

I am super happy to have finished my #PhD in #Quantum!!

Thank you all for my friends and for my amazing supervisors!!

I am super happy! Soon I'll post my thesis on arXiv :)

Thinking of patenting my favorite method for ranking researchers: reading their papers and deciding whether they are good.

Gold

I also think its a bit weird that the paper has not addressed many known mechanisms/no-go theorems showing that this is indeed impossible.

Which aspects of these theorems are you avoiding?

This work is only bringing confusion to an already delicate highly interdisciplinary research topic.

As promised... No, classical spacetime can’t produce entanglement. I can create entanglement by turning a knob on a laser, but the knob isn't mediating entanglement. Is the knob "producing" the entanglement? This week's Nature paper is causing confusion! superposer.substack.com/p/no-classic... 🧪⚛️

“The public has a distorted view of science, because children are taught in school that science is a collection of firmly established truths.

In fact, science is not a collection of truths. It is a continuing exploration of mysteries”

Freeman Dyson (1923–2020), in "How We Know", 2011

T-Zellen, die latentes HIV-1 beherbergen und entweder unbehandelt blieben (oben) oder mit RBP4 behandelt wurden (unten) (Abb.: Dr. Chiara Pastorio / Uniklinikum Ulm)

Ruhende HI-Viren aus der Deckung holen: Das kann ein körpereigenes Protein🦠, das als Vitamin-A-Transporter 🚚bekannt ist. Ulmer Forschende haben diesen natürlichen Wirkstoff zur Latenz-Umkehr entdeckt. Die ist ein weiterer Schritt in Richtung AIDS-Heilung. t1p.de/RBP4 *wt/🔬: Pastorio #uulm

With a long transfer from the Sahara to Fes, I finally finished going through the starter packs below. It was great to see everything you all have been working on! I like to spend some time reading through each profile, so I start to remember who's working on what. Please comment more starter packs!

A one-world interpretation of quantum mechanics The measurement problem is the issue of explaining how the objective classical world emerges from a quantum one. Here we take a different approach. We assume that there is an objective classical syste...

What if the measurement problem isn't about explaining how the classical world emerges from the quantum world...

...but about what happens when quantum systems interact with something that's already classical?

Turns out, the collapse postulate + Born rule emerge!
scirate.com/arxiv/2510.0...
🧪⚛️🧵1/5

Rudi B. P. Pietsch, one of the PhD Students I co-supervise (with prof. Plenio) here at the University of Ulm #UniUlm recently published his first ever research article at #PRA!

Huge congrats to Rudi and Dani!

Its the first of many : )

#QuantumThermodynamics

journals.aps.org/pra/abstract...

Quantum advantage from random geometrically-two-local Hamiltonian dynamics Classical hardness-of-sampling results are largely established for random quantum circuits, whereas analog simulators natively realize time evolutions under geometrically local Hamiltonians. Does a ty...

New (single-author) work: If you simply switch on a typical short-range Hamiltonian for constant time and then measure, the resulting distribution is generically intractable for classical computers.

scirate.com/arxiv/2510.0...

Can't wait to drink contextual tea

Scuola normale decided to put every quantum physics preprint on arXiv to appear today

Quantum arXiv today.

Quantum Tunneling Is a Big Deal. This Year's Nobel Physics Prize Shows Why The Nobel Prize in Physics for 2025 honors scaled-up quantum physics—while sidestepping controversies swirling around quantum computing

Nobel coverage is fast-paced, and there's often not time to reflect on the accomplishment before the next one. (Congrats to the Chem laureates, by the way.)

My day two story on why Clarke, Devoret, and Martinis were looking for macroscopic quantum tunneling and how they managed the tricky search:

Okay, last post on *quantum learning theory with CV systems* (for a few months🫣)

Today's new work tackles another natural and central question in this rapidly developing field: Given an unknown CV state, how to test whether is it Gaussian or not?

arxiv.org/pdf/2510.07305

1/

Happy physics Nobel Prize to all my superconducting-qubit friends!

Nobel prize for physics goes to physics this year