Our group advances both fundamental and application-oriented research of nanoscale optoelectronic devices and their building blocks.
Currently we are working on the following topics:
Quantum machine learning in the context of quantum reservoir computing: The idea is to use randomly coupled quantum systems that are fed classical or quantum inputs. The output is formed by combining weighted measurements on a subset of the quantum systems. In contrast to deep learning artificial neural networks, only the output weights are trained, not the internal parameters of the reservoir computer. Such a platform is resilient towards hardware imperfections and opens up the possibility to take advantage of the exponentially large Hilbert space inherent to quantum mechanical systems. Moreover, it can be realized with todays physical hardware.
Moiré-exciton physics in van der Waals heterostructures:
Inducing a small twist angle between layers of atomically thin semiconductor materials results in the emergence of a moiré superlattice. Excitons perceive the varying stacking order over the moiré unit cell as a deep, trapping moiré potential.
We explore correlated bosonic states of moiré excitons and their interaction with cavity photons.
Multipartite entanglement generation:
Coupled cavities offer a platform to generate multipartite entanglement between spatially separated qubits.
Cavities and qubits form a so-called Jaynes-Cummings system which offers a high degree of controllability by coherent pumping. It is used to drive transitions between the system’s ground state and an targeted entangled state. We are investigating bath engineering as an alternative approach to create entanglement in the steady state.
The generation of spatially distributed entanglement is important for the realization of applications in quantum computing and quantum machine learning.
Nanolasers up to the quantum limit where a single emitter interacts with the quantum-mechanical radiation field
Understanding and control of quantum-mechanical correlations between light and matter