Jonathan Conrad

Excited to share that the Monte Verità Quantum Codes (MVQC) conference will take place April 19–24, 2026 in Monte Verità, Switzerland. We’ll bring together researchers working on quantum error correction across theory, experiment, and multiple platforms. Apply until 12.1.2026. mvqc.ethz.ch

Great opportunity for postdocs in the US looking move to Austria:

stipendien.oeaw.ac.at/en/fellowshi...

Details | Postdoctoral Associate - Computer Science | Careers | Division of Human Resources | Virginia Tech

I'm hiring a postdoc! If you'd like to work with me on quantum learning, error correction, quantum algorithms, and FTQC at Virginia Tech in the Washington, DC metro area, please apply here: careers.pageuppeople.com/968/cw/en-us...

Congrats @csenrui.bsky.social !!!

Continuous Variable Quantum MacWilliams Identities We derive bounds on general quantum error correcting codes against the displacement noise channel. The bounds limit the distances attainable by codes and also apply in an approximate setting. Our main...

New linear programming bounds for QECCs! If I read the results correctly this is vastly general and includes all physically realized codes for CV systems.

arxiv.org/abs/2502.09514

@jenseisert.bsky.social

Thanks!

Happy to announce that I just moved to Lausanne to work at EPFL in the new group headed by Thomas Vidick!

Going skiing on the first day after a move definitely makes for a fun start. :)

also happy to get in the loop! ;)

Julio Magdalena on Anyons!

A Constructive Approach to Zauner's Conjecture via the Stark Conjectures We propose a construction of $d^2$ complex equiangular lines in $\mathbb{C}^d$, also known as SICPOVMs, which were conjectured by Zauner to exist for all d. The construction gives a putatively complet...

Have SIC-POVMs finally been found? @sflammia.bsky.social arxiv.org/abs/2501.03970

Thanks to @vva.bsky.social @ansgarburchards.bsky.social and Joe Iosue for this fun collaboration!

Continuous-variable designs and design-based shadow tomography from random lattices We investigate state designs for continuous-variable quantum systems using the aid of lattice-like quantum states. These are code states of Gottesman-Kitaev-Preskill (GKP) codes. We show that for an n...

Happy holidays everybody! If you get bored feasting or need to take a rest from rewatching Home Alone for the 20th time -- here a little paper from us: arxiv.org/abs/2412.17909 .
We show that GKP codes form CV 2-designs and how to use this to design class. shadow protocols.

I’d imagine every send that is not flashed would now be post-selected….sounds pretty harsh

Factoring an integer with three oscillators and a qubit A common starting point of traditional quantum algorithm design is the notion of a universal quantum computer with a scalable number of qubits. This convenient abstraction mirrors classical computatio...

Congrats to Brenner, Caha, Coiteux-Roy and Koenig for this fantastic result! (4/4)
arxiv.org/abs/2412.13164

I am no expert here but for a theorist this reads like you could just go and try building this? What do the actual physicists think? @zlatko-minev.bsky.social @andreasateth.bsky.social

o.o

Submissions for QCTiP 2025 are now open.

*-lived ;)

Thanks! :)

The fabulous world of GKP codes Quantum error correction is an essential ingredient in the development of quantum technologies. Its subject is to investigate ways to embed quantum Hilbert spaces into a physical system such that this...

Hi all!

I just uploaded my recently defended thesis, I hope you like it. Hit me up if you want to chat about anything GKP/QEC or life. :)

arxiv.org/abs/2412.02442