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.


  • Systematic identification and analysis of use cases based on simulators and NISQ machines
  • Transfer between basic research and industrial application
  • Development of hybrid quantum-classical computing methods
  • Transfer of expertise and training
  • Realisation of pilot projects
  • Consultancy on quantum issues based on almost two decades of commercial and academic experience

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

Bachelor Students





Comparative Analysis of Parameter Selection Heuristics for the Quantum Approximate Optimisation Algorithm
Type: Bachelor thesis
State: finished
Supervisor: Maja Franz
Project: TAQO-PAM
Student: Vincent Eichenseher (submitted: 05. Mar 2024)
Vergleich von Variationalen Quantenschaltkreis-Strukturen für Quanten-Reinforcement Learning
Type: Bachelor thesis
State: finished
Supervisor: Maja Franz
Student: Andreas Fellner (submitted: 20. Feb 2024)
Investigation of the Performance of Different QAOA Variants Under the Influence of Realistic Noise
Type: Master thesis
State: finished
Supervisor: Hila Safi
Student: Simon Thelen (submitted: 29. Oct 2023)
Improving the QUantum computing Application benchmaRK (QUARK) Framework
Type: Bachelor thesis
State: finished
Supervisor: Hila Safi
Student: Martin Meilinger (submitted: 12. Sep 2023)
Assessing QAOA and Warm-Starting QAOA for Sudoku as a Graph Coloring Problem and Various Encodings Thereof
Type: Bachelor thesis
State: finished
Supervisor: Hila Safi
Student: Martin Gogeißl (submitted: 31. Jul 2023)
Uncovering Instabilities in Variational-Quantum Deep Q-Networks
Type: Master thesis
State: finished
Supervisor: Wolfgang Mauerer
Project: TAQO-PAM, QLindA
Student: Maja Franz (submitted: 23. May 2023)
Applicability of Quantum Computing on Database Query Optimization
Type: Master thesis
State: finished
Supervisor: Wolfgang Mauerer
Project: QLindA
Student: Manuel Schönberger (submitted: 22. Dec 2021)
Reinforcement Learning mit parametrisierten Quantenschaltkreisen
Type: Bachelor thesis
State: finished
Supervisor: Wolfgang Mauerer
Project: QLindA
Student: Maja Franz (submitted: 31. Aug 2021)
Verfahren und Konzepte des quantenbasierten Reinforcement Learnings werden vorgestellt und daraus entwickelte Technologien experimentell untersucht.
Assessing an industrial application of quantum annealers
Type: Bachelor thesis
State: finished
Supervisor: Wolfgang Mauerer
Student: Florian Loher (submitted: 20. May 2020)

Central Publications


To Appear
Challenges for Quantum Software Engineering: An Industrial Use Case Perspective
Cecilia Carbonelli, Michael Felderer, Matthias Jung, Elisabeth Lobe, Malte Lochau, Sebastian Luber, Wolfgang Mauerer, Rudolf Ramler, Ina Schäfer, Christoph SchrothQuantum Software: Aspects of Theory and System DesignSpringer-Nature2024.
PDF [BibTex]
To Appear
Superoperators for Quantum Software Engineering
Wolfgang MauererQuantum Software: Aspects of Theory and System DesignSpringer-Nature2024.
PDF [BibTex]
CHEP Conference
Co-Design of Quantum Hardware and Algorithms in Nuclear and High Energy Physics
Maja Franz, Pía Zurita, Markus Diefenthaler, Wolfgang MauererProceedings of the 26th International Conference on Computing in High Energy & Nuclear Physics2024.
PDF [BibTex]
QCEDA: Using Quantum Computers for EDA
Matthias Jung, Sven O. Krumke, Christof Schroth, Elisabeth Lobe, Wolfgang Mauerer2024.
PDF [BibTex]
Reproducibility Report for ACM SIGMOD 2023 Paper: Ready to Leap (by Co-Design)? Join Order Optimisation . . .
Sebastian Schmidl, Yangshen Deng, Pingchuan Ma, Manuel Schönberger, Wolfgang Mauerer2024.
PDF [BibTex]


VLDB Conference A*
Quantum-Inspired Digital Annealing for Join Ordering
Manuel Schönberger, Immanuel Trummer, Wolfgang MauererProceedings of the VLDB Endowment2023.
PDF 10.14778/3632093.3632112 Reproduction Package [BibTex]
IEEE Conference
Workshop Summary: Quantum Machine Learning
Volker Tresp, Steffen Udluff, Daniel Hein, Werner Hauptmann, Martin Leib, Christopher Mutschler, Daniel D. Scherer, Wolfgang MauererProceedings of the IEEE International Conference on Quantum Computing and Engineering2023.
PDF 10.1109/QCE57702.2023.10174 [BibTex]
VLDB Workshop A*
Quantum Optimisation of General Join Trees
Manuel Schönberger, Immanuel Trummer, Wolfgang MauererProceedings of the International Workshop on Quantum Data Science and Management2023.
PDF [BibTex]
Uncovering Instabilities in Variational-Quantum Deep Q-Networks
Maja Franz2023.
PDF [BibTex]
Challenges and Opportunities in Quantum Software Architecture
Tao Yue, Wolfgang Mauerer, Shaukat Ali, Davide TaibiSoftware Architecture: Research Roadmaps from the Community Springer Nature Switzerland2023.
PDF 10.1007/978-3-031-36847-9_1 [BibTex]
IEEE Conference
Effects of Imperfections on Quantum Algorithms: A Software Engineering Perspective
Felix Greiwe, Tom Krüger, Wolfgang Mauerer2023 IEEE International Conference on Quantum Software (QSW)2023.
PDF 10.1109/QSW59989.2023.00014 Reproduction Package [BibTex]
IEEE Conference
Influence of HW-SW-Co-Design on Quantum Computing Scalability
Hila Safi, Karen Wintersperger, Wolfgang Mauerer2023 IEEE International Conference on Quantum Software (QSW)2023.
PDF 10.1109/QSW59989.2023.00022 Reproduction Package [BibTex]
Workshop A*
Joint Proceedings of Workshops at the 49th International Conference on Very Large Data Bases (VLDB 2023), Vancouver, Canada, August 28 - September 1, 2023
Rajesh Bordawekar, Cinzia Cappiello, Vasilis Efthymiou, Lisa Ehrlinger, Vijay Gadepally, Sainyam Galhotra, Sandra Geisler, Sven Groppe, Le Gruenwald, Alon Y. Halevy, Hazar Harmouch, Oktie Hassanzadeh, Ihab F. Ilyas, Ernesto Jiménez-Ruiz, Sanjay Krishnan, Tirthankar Lahiri, Guoliang Li, Jiaheng Lu, Wolfgang Mauerer, Umar Farooq Minhas, Felix Naumann, M. Tamer Özsu, El Kindi Rezig, Kavitha Srinivas, Michael Stonebraker, Satyanarayana R. Valluri, Maria-Esther Vidal, Haixun Wang, Jiannan Wang, Yingjun Wu, Xun Xue, Mohamed Zaït, Kai ZengCEUR-WS.org2023.
Neutral Atom Quantum Computing Hardware: Performance and End-User Perspective
Karen Wintersperger, Florian Dommert, Thomas Ehmer, Andrey Hoursanov, Johannes Klepsch, Wolfgang Mauerer, Georg Reuber, Strohm Thomas, Ming Yin, Sebastian LuberEPJ Quantum Technology10.12023.
PDF 10.1140/epjqt/s40507-023-00190-1 [BibTex]
Optimization Problems in Production and Planning: Approaches and Limitations in View of Possible Quantum Superiority
Maximilian Zwingel, Oguz Kedilioglu, Sebastian Reitelshöfer, Wolfgang MauererProceedings of the 8th MHI ColloquiumSpringer2023.
SIGMOD Tutorial A*
Quantum Machine Learning: Foundation, New Techniques, and Opportunities for Database Research
Tobias Winker, Sven Groppe, Valter Uotila, Zhengtong Yan, Jiaheng Lu, Maja Franz, Wolfgang MauererCompanion of the 2023 International Conference on Management of DataAssociation for Computing Machinery2023.
PDF 10.1145/3555041.3589404 [BibTex]
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 https://doi.org/10.1145/3588946 Reproduction Package [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 https://doi.org/10.1007/978-3-031-21867-5_7 Reproduction Package [BibTex]
Journal 4.45
Uncovering Instabilities in Variational-Quantum Deep Q-Networks
Maja Franz, Lucas Wolf, Maniraman 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 Reproduction Package [BibTex]
SIGMOD A* 2nd Place
Applicability of Quantum Computing on Database Query Optimization
Manuel SchönbergerProceedings of the 2022 International Conference on Management of DataAssociation for Computing Machinery20222nd Place.
PDF 10.1145/3514221.3520257 [BibTex]
SANER Workshop A
1-2-3 Reproducibility for Quantum Software Experiments
Wolfgang Mauerer, Stefanie ScherzingerIEEE International Conference on Software Analysis, Evolution and Reengineering (SANER)2022.
PDF 10.1109/SANER53432.2022.00148 [BibTex]
ICSA Workshop A
Peel | Pile? Cross-Framework Portability of Quantum Software
Manuel Schönberger, Maja Franz, Stefanie Scherzinger, Wolfgang Mauerer2022 IEEE 19th International Conference on Software Architecture Companion (ICSA-C)2022.
PDF 10.1109/ICSA-C54293.2022.00039 Reproduction Package [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]


Workshop A*
APEQS 2020: Proceedings of the 1st ACM SIGSOFT International Workshop on Architectures and Paradigms for Engineering Quantum Software
Wolfgang Mauerer, Sebastian Feld, Claudia Linnhoff-PopienAssociation for Computing Machinery2020.
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 FrontiersAssociation for Computing Machinery2020Best Video.
PDF 10.1145/3387902.3392635 Reproduction Package [BibTex]
Quantum Annealing-Based Software Components: An Experimental Case Study with SAT Solving
Tom Krüger, Wolfgang MauererProceedings of the IEEE/ACM 42nd International Conference on Software Engineering WorkshopsAssociation for Computing Machinery2020.
PDF 10.1145/3387940.3391472 [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]