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Quantum Computing

Quantum computers, which are expected to perform calculations using the laws of quantum mechanics in novel ways that are faster than classical machines, have been studied in basic research over decades. Now, first usable machines are available. The Digitisation Lab works on achieving industrial quantum advantage on gate-based quantum computers and quantum annealers.

Current efforts are aimed at closing the gap between basic research and industrial application by examining questions in their entire technical-scientific breadth. In addition, quantum machine learning, in particular reinforcement learning, and quantum computing for databases is among our core interest.


  • Systematische Identifikation und Analyse von Anwendungsfällen auf Simulationsbasis und NISQ-Maschinen
  • Transfer zwischen Grundlagenforschung und industrieller Nutzung
  • Entwicklung hybrider Rechenverfahren
  • Kompetenztransfer und Ausbildung
  • Umsetzung von Pilotprojekten
  • Beratung zu Quanten-Fragstellungen basierend auf fast zwei Jahrzehnten wirtschaftlicher und akademischer Erfahrung

Research Topics


  • Quantum Reinforcement Learning
  • Tailored Quantum Computing & QPU-SW-Co-Design
  • Production and Manucfacturing Optimisation using Quantum Techniques
  • Quantum Accellerators for Databases
  • Quantum Sofware Engineerung & Reproducibility


  • Quantum Programming Languages
  • Quantum Informatipon Theory & Quantum Electrodynamics
  • Quantum Randomness Generation & Distillation



  • Trevisan Extractor Open Source-Software (GPLv2) auf Github verfügbar.
  • TODO: libciumffa
  • TODO: 1-2-3 reproducibility
  • Replication Packages for Quantum publications



Research Assistants

Doctoral Students


Central Publications


ACM Conference A*
Ready to Leap (by Co-Design)? Join Order Optimisation on Quantum Hardware
Manuel Schönberger, Stefanie Scherzinger, Wolfgang MauererProceedings of ACM SIGMOD/PODS International Conference on Management of Data2023.
PDF [BibTex]


QPU-System Co-Design for Quantum HPC Accelerators
Karen Wintersperger, Hila Safi, Wolfgang MauererProceedings of the 35th GI/ITG International Conference on the Architecture of Computing SystemsGesellschaft für Informatik2022.
PDF [BibTex]
Journal 4.45
Uncovering Instabilities in Variational-Quantum Deep Q-Networks
Maja Franz, Lucas Wolf, M. Periyasamy, Ch. Ufrecht, D. Scherer, A. Plinge, Ch. Mutschler, Wolfgang MauererJournal of The Franklin InstituteElsevier (Open Access)2022.
PDF 10.1016/j.jfranklin.2022.08.021 [BibTex]
SIGMOD A* 2nd Place
Applicability of Quantum Computing on Database Query Optimization
Manuel SchönbergerACM SIGMOD Student Research Competition 2022 (undergraduate)20222nd Place.
PDF [BibTex]
SANER Workshop A
1-2-3 Reproducibility for Quantum Software Experiments
Wolfgang Mauerer, Stefanie ScherzingerQ-SANER@IEEE International Conference on Software Analysis, Evolution and Reengineering2022.
PDF [BibTex]
ICSA Workshop A
Peel | Pile? Cross-Framework Portability of Quantum Software
Manuel Schönberger, Maja Franz, Stefanie Scherzinger, Wolfgang MauererQSA@IEEE International Conference on Software Architecture (ICSA)2022.
PDF [BibTex]


Journal 4.45
Industry Quantum Computing Applications
Andreas Bayerstadler, Guillaume Becquin, Julia Binder, Thierry Botter, Hans Ehm, Thomas Ehmer, Marvin Erdmann, Norbert Gaus, Philipp Harbach, Maximilian Hess, Johannes Klepsch, Martin Leib, Sebastian Luber, Andre Luckow, Maximilian Mansky, Wolfgang Mauerer, Florian Neukart, Christoph Niedermeier, Lilly Palackal, Ruben Pfeiffer, Carsten Polenz, Johanna Sepulveda, Tammo Sievers, Brian Standen, Michael Streif, Thomas Strohm, Clemens Utschig-Utschig, Daniel Volz, Horst Weiss, Fabian Winter{EPJ} Quantum Technology8.1Springer Science and Business Media LLC2021.
PDF 10.1140/epjqt/s40507-021-00114-x [BibTex]


CF A Best Video
Approximate Approximation on a Quantum Annealer
Irmi Sax, Sebastian Feld, Sebastian Zielinski, Thomas Gabor, Claudia Linnhoff-Popien, Wolfgang MauererProceedings of the 17th ACM International Conference on Computing Frontiers2020Best Video.
PDF [BibTex]
ICSE Workshop A*
Quantum Annealing-Based Software Components: An Experimental Case Study with SAT Solving
Tom Krüger, Wolfgang MauererQ-SE@ICSE2020.
PDF [BibTex]
ISAAI Symposium
Towards Understanding Approximation Complexity on a Qantum Annealer
I. Sax, S. Feld, S. Zielinski, T. Gabor, C. Linhoff-Popien, Wolfgang MauererProc. 1st International Symposium on Applied Artificial Intelligence2020.
PDF [BibTex]


ICT Converence
A Hybrid Solution Method for the Capacitated Vehicle Routing Problem Using a Quantum Annealer
Sebastian Feld, Christoph Roch, Thomas Gabor, Christian Seidel, Florian Neukart, Isabella Galter, Wolfgang Mauerer, Claudia Linnhoff-PopienFrontiers in {ICT}6Frontiers Media SA2019.
PDF 10.3389/fict.2019.00013 [BibTex]
QTOP Workshop
Assessing Solution Quality of 3SAT on a Quantum Annealing Platform
T. Gabor, S. Zielinski, S. Feld, Ch. Roch, Ch. Seidel, F. Neukart, I. Galter, Wolfgang Mauerer, C. Linnhoff-PopienProc. Int. Workshop on Quantum Technology and Optimization Problems (QTOP)2019.
PDF [BibTex]


Journal 3.73
Theory of quantum frequency conversion and type-II parametric down-conversion in the high-gain regime
Andreas Christ, Benjamin Brecht, Wolfgang Mauerer, Christine SilberhornNew Journal of Physics15.5IOP Publishing2013.
PDF 10.1088/1367-2630/15/5/053038 [BibTex]


CLEO Conference
A High-Speed Secure Quantum Random Number Generator Based on Vacuum States
Christian Gabriel, Christoffer Wittmann, Bastian Hacker, Wolfgang Mauerer, Elanor Huntington, Metin Sabuncu, Christoph Marquardt, Gerd LeuchsConference on Lasers and Electro-Optics 2012OSA2012.
PDF 10.1364/cleo_at.2012.jw4a.103 [BibTex]


Journal 20.03
A generator for unique quantum random numbers based on vacuum states
Christian Gabriel, Christoffer Wittmann, Denis Sych, Ruifang Dong, Wolfgang Mauerer, Ulrik L. Andersen, Christoph Marquardt, Gerd LeuchsNature Photonics4.10Springer Science and Business Media LLC2010.
10.1038/nphoton.2010.197 [BibTex]


Journal 3.14
How colors influence numbers: Photon statistics of parametric down-conversion
Wolfgang Mauerer, Malte Avenhaus, Wolfram Helwig, Christine SilberhornPhysical Review A80.5American Physical Society (APS)2009.
PDF 10.1103/physreva.80.053815 [BibTex]
Journal 4.23
Multimode states in decoy-based quantum-key-distribution protocols
Wolfram Helwig, Wolfgang Mauerer, Christine SilberhornPhysical Review A80.5American Physical Society (APS)2009.
PDF 10.1103/physreva.80.052326 [BibTex]


Journal 9.16
Photon Number Statistics of Multimode Parametric Down-Conversion
M. Avenhaus, H. B. Coldenstrodt-Ronge, K. Laiho, W. Mauerer, I. A. Walmsley, C. SilberhornPhysical Review Letters101.5American Physical Society (APS)2008.
PDF 10.1103/physrevlett.101.053601 [BibTex]
Recent developments in quantum key distribution: Theory and practice
Wolfgang Mauerer, W. Helwig, Ch. SilberhornAnnalen der Physik17.2-3Wiley2008.
PDF 10.1002/andp.200710284 [BibTex]


Journal 3.14
Quantum key distribution with passive decoy state selection
Wolfgang Mauerer, Christine SilberhornPhysical Review A75.5American Physical Society (APS)2007.
10.1103/physreva.75.050305 [BibTex]
Quantum Key Distribution: Closing the Gap to Perfect Sources
Wolfgang Mauerer, Christine SilberhornProc. 7th International Conference on Quantum Communication2007.


Semantics and Simulation of Communication in Quantum Programming
Wolfgang Mauerer2005Betreuer: Prof. Dr. Norbert Lütkenhaus (Physik), Prof. Dr. Dr. Volker Strehl (Informatik).
PDF [BibTex]