David Sutter
@quantum_sutter
Quantum information theorist at @IBMResearch
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Uhlmann's theorem states that the fidelity of two states rho and sigma can be expressed in terms of their purifications (where the fidelity simplifies). In arxiv.org/abs/2502.01749 we (with @giulia_qp and Renato Renner) generalize Uhlmann's theorem to Rényi relative entropies.
Follow up work on the effective dimension (with M. Datres, GP. Leonardi, @AFigalli): (i) stronger generalization bound (ii) lower bound that can be computed efficiently (for Markovian models) (iii) new simulation results --> check out arxiv.org/abs/2401.09184
We finally understand how to (optimally) cut arbitrary two-qubit gates. Two interesting findings: (1) cutting multiple gates jointly is always cheaper than cutting them individually (2) classical communication does not help ---> check out arxiv.org/abs/2312.11638
There is something mesmerising about seeing one's paper(s) completely plagiarised, theorem by theorem, without any reference, and posted on arXiv. Compare arxiv.org/abs/2010.02152 with our arxiv.org/abs/1604.03023
Which of the two cuts below (dotted red vs dashed blue) is better? And what are the optimal costs? --> check out arxiv.org/abs/2302.03366
IBM blogpost about our recent work on circuit knitting research.ibm.com/blog/circuit-k…
Does classical communication between (small) quantum computers help to run large computations? We show it does. Check out arxiv.org/abs/2205.00016
In recognition of his contributions to mathematical physics, Jürg Fröhlich of @ETH_en is being inducted into the National Academy of Sciences. Watch the #NAS159 livestream: ow.ly/uuXh50IVNP2
How does entropy accumulate? Check out our recent generalization of the EAT arxiv.org/abs/2203.04989 [joint work with Tony, Omar, and Renato]
How hard is it to train a quantum support vector machine? --> check out arxiv.org/abs/2203.00031 (joint work with @GianGentinetta, Arne, and Stefan
New arXiv paper out! Purely classical machine learning :) in collaboration with @quantum_sutter @AFigalli and Stefan Woerner. We define and motivate a measure of capacity for ML models: the local effective dimension. We show how this quantity bounds generalization error 1/3
Happy to finally get this paper published and looking forward to seeing more results that bring error mitigation and correction together. @quantum_sutter journals.aps.org/prl/abstract/1…
I'm at #iccmp2021 today to receive the 2019 AHP prize awarded jointly with my co-authors Ralph Silva and @postquantum for arxiv.org/ct?url=https%3…. I wish they could be there. Nice to see @quantum_sutter (AHP prize 2018) and J. Bauch (AHP prize 2017) in person again!
Check out the recent IBM blog post research.ibm.com/blog/quantum-n… about our recent paper on the power of quantum neural networks [joint work with @AmiraMorphism, C. Zoufal, @AurelienLucchi, @AFigalli, S. Woerner]
Our work on "The power of quantum neural networks" has been published in @NatComputSci! A huge thanks to the coauthors, @quantum_sutter @AFigalli @AurelienLucchi Christa Zoufal and Stefan Woerner. Hard work pays off! 🙂 nature.com/natcomputsci/v…
When we first derived error mitigation we tried to make it clear it was not error correction. Since then I have wanted to bring them together and in this work we start to close the gap. Still a long way to go but I really like this direction of research arxiv.org/abs/2103.04915
Error mitigation techniques may allow a smooth transition into the fault-tolerant computing era. Together with Christophe and Stefan from @IBMResearch and @ETH_physics we improve the sampling overhead for the quasiprobability method arxiv.org/abs/2101.09290
Happy to share a new quantum algorithm to solve convex dynamic programming problems with a quadratic speedup. Joint work with Giacomo-@sutter_tobias-Stefan from @IBMResearch/@EPFL_en (see arxiv.org/abs/2011.11654)
Next up, @quantum_sutter with a very interesting talk on "Quantum Brascamp-Lieb dualities". #BIID8
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