Christoph Hirche

Ian George, @christophhirche.bsky.social, Theshani Nuradha, & I have issued an update of our q. Doeblin coefficients paper:

arxiv.org/abs/2503.22823

Main changes consist of an expanded section 8.5 on mixing, indistinguishability, & decoupling times of quantum Markov chains. See attached images

08.07.2025 09:09 — 👍 7    🔁 1    💬 0    📌 0

Outstanding success for LUH: three Clusters of Excellence granted funding Leibniz University Hannover will apply for University of Excellence status.

Cause for celebration: millions of euros in continued funding for research on photonics, measurements at the quantum frontier and personalised care for hearing loss. #LUH has been granted funding for three Clusters of Excellence and will apply for University of Excellence status.

22.05.2025 15:45 — 👍 8    🔁 4    💬 0    📌 0

Slides on "Quantum Doeblin Coefficients: Interpretations and Applications" available here:

zenodo.org/records/1544...

Joint work with Ian George, @christophhirche.bsky.social, and Theshani Nuradha

17.05.2025 06:51 — 👍 7    🔁 1    💬 0    📌 0

Partial orders and contraction for BISO channels A fundamental question in information theory is to quantify the loss of information under a noisy channel. Partial orders and contraction coefficients are typical tools to that end, however, they are ...

New preprint in preparation for ISIT:
With Oxana Shaya,
"Partial orders and contraction for BISO channels"
scirate.com/arxiv/2504.1...

Within the BISO channels the BEC and BSC are extremal in many aspects. We extend this to additional partial orders and show what role contraction plays here.

24.04.2025 14:47 — 👍 3    🔁 0    💬 0    📌 0

Joint work w/ Ian George, Christoph Hirche @christophhirche.bsky.social, & Theshani Nuradha "Quantum Doeblin Coefficients: Interpretations and Applications":

arxiv.org/abs/2503.22823

Great collaboration & enjoyable project!

Interpretations of q. Doeblin coefficients in attached tables

01.04.2025 15:11 — 👍 17    🔁 1    💬 1    📌 0

Thanks for hosting me at Cornell last week, @markwilde.bsky.social !

10.03.2025 08:11 — 👍 5    🔁 0    💬 0    📌 0

Talk Information 03/06/2025 | FIND

The next Cornell ECE FIND seminar speaker on March 6 will be @christophhirche.bsky.social:

find.engineering.cornell.edu/seminar/talk...

"New quantum f-divergences and their applications"

Looking forward to it!

24.02.2025 19:08 — 👍 11    🔁 2    💬 0    📌 0

New preprint:
"Optimization Driven Quantum Circuit Reduction"
w/ Bodo Rosenhahn & Tobias J. Osborne
Transpiling quantum circuits well to specific gate sets is a hard but important problem near-term. We apply tools from ML to give an effective and scalable approach.
scirate.com/arxiv/2502.1...

21.02.2025 12:41 — 👍 6    🔁 0    💬 0    📌 0

We're looking for a new addition to our group. Drop me a message if you're interested!

13.02.2025 15:58 — 👍 8    🔁 3    💬 0    📌 0

Some properties and applications of the new quantum $f$-divergences Recently, a new definition for quantum $f$-divergences was introduced based on an integral representation. These divergences have shown remarkable properties, for example when investigating contractio...

Trying this out by announcing our new preprint:
Not too long ago, @marcotomamichel.bsky.social and I gave a new definition of quantum f-divergences. Now, we teamed up with Salman Beigi to dive deeper into their properties and how they relate to previous definitions:

scirate.com/arxiv/2501.0...

08.01.2025 12:57 — 👍 16    🔁 1    💬 0    📌 0