Office: IBM Research Rüschlikon
E-mail: dsu@zurich.ibm.com
I am a Staff Research Scientist at IBM Research working on quantum computing and quantum information theory.
I obtained my PhD degree from the Institute for Theoretical Physics at ETH Zurich under the supervision of Renato Renner. My thesis can be found here.
I am the author of the book "Approximate Quantum Markov Chains" published by SpringerBriefs in Mathematical Physics
Curriculum vitae [pdf]
News
Robust generalized quantum Stein's lemma [arXiv]
Relaxing the iid assumption to a better justified almost-iid assumption in information theory [arXiv]
Extension of Uhlmann's theorem to relative entropies [arXiv]
Awards
Annals Henri Poincaré Prize 2018 [picture]
Thomas M. Cover Dissertation Award 2019 [picture]
ETH medal for outstanding doctoral thesis 2018 [picture]
Jack Keil Wolf Student Paper Award at ISIT 2016 [picture]
Jack Keil Wolf Student Paper Award finalist (shortlisted) at ISIT 2013
Publications and Preprints
See the arXiv and Google Scholar or see Publications
Selected Talks
"Almost-iid states", Pisa, 2026 [video]
"Uhlmann's theorem for relative entropies", Firenze & Aachen, 2025,
"Circuit knitting with classical communication" TUM, 2022 and 2025 and EPFL 2022 [video, video]
"Towards a quantum advantage in machine learning", Math Colloquium, Trento, 2022 [video]
"Approximate quantum Markov chains", ICMP, Geneva, 2021 [pdf, video]
"Error mitigation for universal gates on encoded qubits", Pasadena, 2021
"The power of quantum neural networks", Cambridge, 2021, Amsterdam, 2021, QML_meetup, 2021 [video]
"Quantum Legendre-Fenchel transform", Informs, 2020
"Quantum Brascamp-Lieb dualities", Beyond iid, 2020 [pdf] [zoom]
"A chain rule for the quantum relative entropy", TUM, 2019 [pdf], IPAM, 2021 [video], Tübingen 2021
"Quantum information theory", IBM Research, 2019 [pdf] and EPFL, 2019 [pdf]
"A new approach to prove entropy inequalities", Cambridge, 2019 [pdf]
"Generalized maximum entropy estimation", Imperial College, 2019 [pdf]
"Approximate quantum Markov chains", PhD defense, ETH Zurich, 2018 [pdf]
"Approximate quantum Markov chains", University of Waterloo, 2017 [pdf]
"Logarithmic trace inequalities and approximate quantum Markov chains", ISIT, 2017 [pdf]
"Strenghtened monotonicity of relative entropy via pinched Petz recovery map", ISIT, 2016 [pdf]
"Multivariate trace inequalities", QIP, 2017, Stanford 2016, Caltech, 2016, Beyond iid 2016, and IFA, ETH, Zurich, 2016 [pdf] [QIP talk]
"Universal recoverability in quantum information theory", QIP 2016, MIT 2016, GBMS 2015 [pdf] [QIP talk (part I)] [QIP talk (part II)]
"Approximate degradable quantum channels", QIP 2016, Beyond iid 2015, ISIT 2015, ICITS 2015 [pdf] [talk beyond iid] [QIP talk (part I)] [QIP talk (part I)]
"Alignment of polarized sets", ISIT 2015, ICITS 2015 [pdf]
"Efficient approximation of quantum channel capacities", Delft 2015
"Efficient approximation of discrete memoryless channel capacities", ISIT 2014 [pdf]
"Universal polar codes for more capable and less noisy channels and sources, ISIT 2014 [pdf]
"Efficient secret key distillation over quantum channels", QCrypt 2014, ISIT 2013 [pdf]
"Efficient one-way secret-key agreement and private channel coding via polarization", ASIACRYPT 2013 [pdf]
"Achieving the capacity of any DMC using only polar codes", ITW 2012