Our research profile
Our research group focuses on foundational questions in quantum information and open quantum systems. A first major topic is the phenomenon of quantum entanglement between two or more particles. Here, we are developing analytical approaches to characterize the different forms of entanglement and their usefulness.
A second major topic is quantum thermodynamics. There, we extend and refine the thermodynamical laws using tools from quantum optics and information theory in order to understand how microscopic quantum systems exchange heat, work, and information with their environment.
Third, we are developing methods to analyze and improve quantum information processing devices using tools like shadow tomography or error mitigation.
In this research, the group forges a bridge from advanced mathematical methods to collaborations with experimentalists. We work closely with other groups doing quantum science at the University of Siegen. In addition, we collaborate with many partners around the world, e.g., from Austria, Brazil, China, France, Poland, Spain, and Sweden.
Main research areas
- Multi-particle Entanglement
- Graph States and the Stabilizer Formalism
- Theory of Measurements in Quantum Mechanics
- Open Quantum Systems
- Bayesian Metrology
- Shadow Tomography
Our courses
We offer various lectures and courses for the Bachelor's degree program in Physics, the Master's degree program in Physics, and the Master's degree program in Quantum Science program. The courses of the current semester can be viewed and booked on unsiono and can be booked. The regularly offered courses are
- Introduction to Quantum Theory
- Concepts of Quantum Science
- Quantum Thermodynamics
- Key Concepts of Theoretical Physics
- Foundations of Quantum Mechanics
- Quantum Information Theory
- Machine Learning
Our publications
Violating noncontextual realism through sequential measurements
Violating noncontextual realism through sequential measurements
Multiparticle entanglement in graph-diagonal states: Necessary and sufficient conditions for four qubits
Multiparticle entanglement in graph-diagonal states: Necessary and sufficient conditions for four qubits
Testing spontaneous localization theories with matter-wave interferometry
Testing spontaneous localization theories with matter-wave interferometry
Entanglement witnesses for graph states: General theory and examples
Entanglement witnesses for graph states: General theory and examples
Concept of an ionizing time-domain matter-wave interferometer
Concept of an ionizing time-domain matter-wave interferometer
Taming multiparticle entanglement
Taming multiparticle entanglement
Memory cost of quantum contextuality
Memory cost of quantum contextuality
Quantum interference of large organic molecules
Quantum interference of large organic molecules
Separability criteria and entanglement witnesses for symmetric quantum states
Separability criteria and entanglement witnesses for symmetric quantum states
Master equation for the motion of a polarizable particle in a multimode cavity
Master equation for the motion of a polarizable particle in a multimode cavity
Experimental demonstration of a hyper-entangled ten-qubit Schrödinger cat state
Experimental demonstration of a hyper-entangled ten-qubit Schrödinger cat state
Not all pure entangled states are useful for sub-shot-noise interferometry
Not all pure entangled states are useful for sub-shot-noise interferometry
Postal address
University of Siegen
Department of Physics
Emmy-Noether-Campus
Walter-Flex-Straße 3
57072 Siegen
Germany
Visitor address
University of Siegen
Department of Physics
Emmy-Noether-Campus, Room B-107
Walter-Flex-Straße 3
57072 Siegen
Germany
Secretariat
You can find the contact details of the group members in the team overview.