Timo Hillmann
@timohillmann.bsky.social
PhD student @ Chalmers University of Technology
Reposted by Timo Hillmann
happy to share this preprint from last week scirate.com/arxiv/2510.0... - my first with Iceberg!
big thanks to Larry and Nouedyn, who led this cool project ❄️
we have also written a short blogpost about it www.iceberg-quantum.com/blog/fast-su...
comments welcome 🧊
big thanks to Larry and Nouedyn, who led this cool project ❄️
we have also written a short blogpost about it www.iceberg-quantum.com/blog/fast-su...
comments welcome 🧊
Fast surgery for quantum LDPC codes
Quantum LDPC codes promise significant reductions in physical qubit overhead compared with topological codes. However, many existing constructions for performing logical operations come with distance-...
scirate.com
October 13, 2025 at 7:36 AM
happy to share this preprint from last week scirate.com/arxiv/2510.0... - my first with Iceberg!
big thanks to Larry and Nouedyn, who led this cool project ❄️
we have also written a short blogpost about it www.iceberg-quantum.com/blog/fast-su...
comments welcome 🧊
big thanks to Larry and Nouedyn, who led this cool project ❄️
we have also written a short blogpost about it www.iceberg-quantum.com/blog/fast-su...
comments welcome 🧊
Working on LSD was fun! - Our paper on Localized statistics decoding (LSD) for qLDPC codes is now in print.
LSD is a highly parallelizable, reliability-guided inversion decoder that exploits the clustering of errors. Think of it as a parallel version of OSD.
www.nature.com/articles/s41...
LSD is a highly parallelizable, reliability-guided inversion decoder that exploits the clustering of errors. Think of it as a parallel version of OSD.
www.nature.com/articles/s41...
Localized statistics decoding for quantum low-density parity-check codes - Nature Communications
Quantum low-density parity-check (QLDPC) codes offer lower overhead than topological quantum error-correcting codes, but decoding remains a key challenge for scalable fault-tolerant quantum computing....
www.nature.com
September 3, 2025 at 3:47 PM
Working on LSD was fun! - Our paper on Localized statistics decoding (LSD) for qLDPC codes is now in print.
LSD is a highly parallelizable, reliability-guided inversion decoder that exploits the clustering of errors. Think of it as a parallel version of OSD.
www.nature.com/articles/s41...
LSD is a highly parallelizable, reliability-guided inversion decoder that exploits the clustering of errors. Think of it as a parallel version of OSD.
www.nature.com/articles/s41...
Reposted by Timo Hillmann
Der Polizist behält seinen Job, denn: "Aus den Nachrichten ergebe sich noch keine eindeutig verfassungsfeindliche Gesinnung."
Während seines Einsatzes als Leibwächter für Charlotte Knobloch, Präsidentin der israelitischen Kultusgemeinde - schrieb er: "Ich scheiß ihr vor die Tür, schön braun, mit Fähnchen". Er wünsche sich, seine Schutzperson würde vergast bzw in ein Konzentrationslager verbracht (…).
tinyurl.com/2dp3fa58
tinyurl.com/2dp3fa58
"Fahrziel Auschwitz": Polizist behält Job trotz menschenverachtender Chat-Nachrichten
Die Chats eines Polizisten waren fremdenfeindlich, geschmacklos und durchzogen von rechtsradikaler Rhetorik. Nicht genug für eine Suspendierung, meint der VGH München.
tinyurl.com
July 1, 2025 at 8:57 AM
Der Polizist behält seinen Job, denn: "Aus den Nachrichten ergebe sich noch keine eindeutig verfassungsfeindliche Gesinnung."
Reposted by Timo Hillmann
Paul Hilaire and I are recruiting a PhD student to work on demonstrations of fault-tolerant protocols for near-term quantum hardware (photonics & cold atoms). The focus is on quantum error correction, low-overhead schemes, and actual implementation on hardware
June 27, 2025 at 4:38 PM
Paul Hilaire and I are recruiting a PhD student to work on demonstrations of fault-tolerant protocols for near-term quantum hardware (photonics & cold atoms). The focus is on quantum error correction, low-overhead schemes, and actual implementation on hardware
Great work by the IBM Quantum team on Relay-BP, a BP-only heuristic decoder for general qLDPC codes. From a first look, the performance seems strong and further supports qLDPC architectures from a decoding-focused perspective.
arxiv.org/abs/2506.01779
arxiv.org/abs/2506.01779
Improved belief propagation is sufficient for real-time decoding of quantum memory
We introduce a new heuristic decoder, Relay-BP, targeting real-time quantum circuit decoding for large-scale quantum computers. Relay-BP achieves high accuracy across circuit-noise decoding problems: ...
arxiv.org
June 3, 2025 at 8:28 AM
Great work by the IBM Quantum team on Relay-BP, a BP-only heuristic decoder for general qLDPC codes. From a first look, the performance seems strong and further supports qLDPC architectures from a decoding-focused perspective.
arxiv.org/abs/2506.01779
arxiv.org/abs/2506.01779
Reposted by Timo Hillmann
I recently created a simple Python wrapper for the Tesseract decoder for personal use, but I’ve decided to make it public in case others find it useful. Feel free to let me know if you encounter any issues!
github.com/seokhyung-le...
github.com/seokhyung-le...
GitHub - seokhyung-lee/tesseract-python: Python Wrapper for Tesseract Decoder
Python Wrapper for Tesseract Decoder. Contribute to seokhyung-lee/tesseract-python development by creating an account on GitHub.
github.com
May 16, 2025 at 11:25 AM
I recently created a simple Python wrapper for the Tesseract decoder for personal use, but I’ve decided to make it public in case others find it useful. Feel free to let me know if you encounter any issues!
github.com/seokhyung-le...
github.com/seokhyung-le...
Reposted by Timo Hillmann
There is now an official announcement: The TIB has archived the current status of the arXiv:
blog.tib.eu/2025/05/14/p...
blog.tib.eu/2025/05/14/p...
Protecting Science: TIB builds Dark Archive for arXiv - TIB-Blog
Research and science are international; it is not for nothing that we speak of international specialist communities. Although a service such as arXiv is operated by an institution based in the USA, na...
blog.tib.eu
May 14, 2025 at 2:50 PM
There is now an official announcement: The TIB has archived the current status of the arXiv:
blog.tib.eu/2025/05/14/p...
blog.tib.eu/2025/05/14/p...
Reposted by Timo Hillmann
New AIP report discusses impact of funding cuts in physics & astro depts: “No one can be productive in a climate like this—it is the end of the US scientific and technical dominance in the world—we will not recover from this in a decade...”. ⚛️🔭 physics.aps.org/articles/v18...
May 3, 2025 at 1:59 PM
New AIP report discusses impact of funding cuts in physics & astro depts: “No one can be productive in a climate like this—it is the end of the US scientific and technical dominance in the world—we will not recover from this in a decade...”. ⚛️🔭 physics.aps.org/articles/v18...
Reposted by Timo Hillmann
Ok, heute ARD-Brennpunkt zur AfD, auf einen der Gäste kommt ihr nie. Richtig, Tino Chrupalla. Vor 80 Jahren hätte der zumindest auf der Anklagebank gesessen. Woher diese unbändige Lust, weiter mit Nazis zu reden? Ist es Masochismus? Erinnerungskultur tm? Oder vermisst ihr einfach eure Omas und Opas?
May 2, 2025 at 5:00 PM
Ok, heute ARD-Brennpunkt zur AfD, auf einen der Gäste kommt ihr nie. Richtig, Tino Chrupalla. Vor 80 Jahren hätte der zumindest auf der Anklagebank gesessen. Woher diese unbändige Lust, weiter mit Nazis zu reden? Ist es Masochismus? Erinnerungskultur tm? Oder vermisst ihr einfach eure Omas und Opas?
Reposted by Timo Hillmann
Next up in session A is Lucas Berent telling us about LSD, a popular topic in Berlin.
April 23, 2025 at 9:34 AM
Next up in session A is Lucas Berent telling us about LSD, a popular topic in Berlin.
Reposted by Timo Hillmann
This past week, I received a second stop work order on one of my grants. This now means that we can no longer spend on *two* of my major grants. Several of my group members will now graduate earlier than expected, I am looking into being a consultant for the summer, and students will do internships
April 12, 2025 at 10:37 AM
This past week, I received a second stop work order on one of my grants. This now means that we can no longer spend on *two* of my major grants. Several of my group members will now graduate earlier than expected, I am looking into being a consultant for the summer, and students will do internships
Reposted by Timo Hillmann
Dass ausgerechnet die CSU-Politikerin Doro Bär, die noch vor wenigen Jahren den menschengemachten Klimawandel leugnete, jetzt neue Forschungsministerin werden soll - ein Job, bei dem es ganz besonders darauf ankommt, der Kraft der Wissenschaft zu vertrauen, ist m.E. hochproblematisch.
April 10, 2025 at 2:53 PM
Dass ausgerechnet die CSU-Politikerin Doro Bär, die noch vor wenigen Jahren den menschengemachten Klimawandel leugnete, jetzt neue Forschungsministerin werden soll - ein Job, bei dem es ganz besonders darauf ankommt, der Kraft der Wissenschaft zu vertrauen, ist m.E. hochproblematisch.
Typing away on my PhD thesis - no matter where I go next, the views from my office will be hard to beat, unfortunately.
March 14, 2025 at 5:25 PM
Typing away on my PhD thesis - no matter where I go next, the views from my office will be hard to beat, unfortunately.
When we wrote the theory proposal for the dissipatively stabilized squeezed cat qubit, we got into an argument with the copy editors of the journal. I had a strong opinion against calling it „cat state qubit“ (as no one does) which got so far that we almost had to add a disclaimer, see the mail
March 13, 2025 at 9:07 AM
When we wrote the theory proposal for the dissipatively stabilized squeezed cat qubit, we got into an argument with the copy editors of the journal. I had a strong opinion against calling it „cat state qubit“ (as no one does) which got so far that we almost had to add a disclaimer, see the mail
Reposted by Timo Hillmann
I think it would be a good time to reinstantiate the mirror network for the # arXiv. It’s an essential piece of the global research community in math, physics, computer-science and adjacent fields. Under the current circumstances it should not only be hosted in the US.
#quantum #math #physics #cs
#quantum #math #physics #cs
February 15, 2025 at 10:38 PM
Reposted by Timo Hillmann
First realization of a dissipatively stabilized squeezed cat qubit (a slight variation that we called a moon cat 🌛 actually), it was super interesting to work on this with experimentalists!
arxiv.org/abs/2502.07892
My two key takeaways ⬇️⬇️
arxiv.org/abs/2502.07892
My two key takeaways ⬇️⬇️
Enhancing dissipative cat qubit protection by squeezing
Dissipative cat-qubits are a promising architecture for quantum processors due to their built-in quantum error correction. By leveraging two-photon stabilization, they achieve an exponentially suppres...
arxiv.org
February 14, 2025 at 4:36 PM
First realization of a dissipatively stabilized squeezed cat qubit (a slight variation that we called a moon cat 🌛 actually), it was super interesting to work on this with experimentalists!
arxiv.org/abs/2502.07892
My two key takeaways ⬇️⬇️
arxiv.org/abs/2502.07892
My two key takeaways ⬇️⬇️
I’m super excited to see the experimental realization of a variant of the dissipatively stabilized squeezed cat that we proposed! Congrats to Alice & Bob and everyone else involved
Especially great to see that it comes with similar performance gains as promised by the theory
arxiv.org/abs/2502.07892
Especially great to see that it comes with similar performance gains as promised by the theory
arxiv.org/abs/2502.07892
Enhancing dissipative cat qubit protection by squeezing
Dissipative cat-qubits are a promising architecture for quantum processors due to their built-in quantum error correction. By leveraging two-photon stabilization, they achieve an exponentially suppres...
arxiv.org
February 13, 2025 at 8:19 AM
I’m super excited to see the experimental realization of a variant of the dissipatively stabilized squeezed cat that we proposed! Congrats to Alice & Bob and everyone else involved
Especially great to see that it comes with similar performance gains as promised by the theory
arxiv.org/abs/2502.07892
Especially great to see that it comes with similar performance gains as promised by the theory
arxiv.org/abs/2502.07892
@adamwills1.bsky.social updates is on his recent work with collaborators on constant overhead magic state distillation and quantum codes with addressable and transversal non-Clifford gates #Coogee25
February 11, 2025 at 2:08 AM
@adamwills1.bsky.social updates is on his recent work with collaborators on constant overhead magic state distillation and quantum codes with addressable and transversal non-Clifford gates #Coogee25
Armanda Quintavalle giving a great introduction to Quantum Tanner codes and talking about on going work of finding small~ish examples with good properties. #Coogee25
February 11, 2025 at 12:46 AM
Armanda Quintavalle giving a great introduction to Quantum Tanner codes and talking about on going work of finding small~ish examples with good properties. #Coogee25
@mattmcewen.bsky.social kicking of #Coogee25.
February 10, 2025 at 12:13 AM
@mattmcewen.bsky.social kicking of #Coogee25.
Reposted by Timo Hillmann
Soon, @christophe.vuillot.info and I will be restarting the online QASAR seminar series on quantum error correction! Please let me know if you would like to give a talk :)
January 23, 2025 at 1:04 PM
Soon, @christophe.vuillot.info and I will be restarting the online QASAR seminar series on quantum error correction! Please let me know if you would like to give a talk :)
Reposted by Timo Hillmann
PhD/PostDoc in Quantum Computing for Quantum Chemistry
Have a look if you want to develop novel quantum computing approaches to enable accurate electronic structure calculations: dobrautz.github.io/jobs/
Sharing and endorsing would be greatly appreciated <3
#chemsky #quantsky #quantum #chemjobs
Have a look if you want to develop novel quantum computing approaches to enable accurate electronic structure calculations: dobrautz.github.io/jobs/
Sharing and endorsing would be greatly appreciated <3
#chemsky #quantsky #quantum #chemjobs
Jobs | Werner Dobrautz
Open positions in our group
dobrautz.github.io
January 14, 2025 at 9:29 PM
PhD/PostDoc in Quantum Computing for Quantum Chemistry
Have a look if you want to develop novel quantum computing approaches to enable accurate electronic structure calculations: dobrautz.github.io/jobs/
Sharing and endorsing would be greatly appreciated <3
#chemsky #quantsky #quantum #chemjobs
Have a look if you want to develop novel quantum computing approaches to enable accurate electronic structure calculations: dobrautz.github.io/jobs/
Sharing and endorsing would be greatly appreciated <3
#chemsky #quantsky #quantum #chemjobs