Research group Prof. Dr. Tilmann Kuhn

 

Carrier Dynamics in
Nanostructured Systems

 

The research of the AG Kuhn is focused on the theoretical description and simulation of non-equilibrium dynamics of interacting many-body systems, as it appears in many solid state systems, nanostructures or other systems like ultra cold quantum gases.
| Münster (upm)
Hexagonal boron nitride (red: boron atoms, blue: nitrogen atoms) with a colour centre (blue-red) illuminated with ultrafast laser pulses (green)
© WWU - Johann Preuß

Physicists study optically induced quantum dynamics in single-photon emitters

For tomorrow’s quantum technologies: hexagonal boron nitride under the magnifying glass / findings published in ‘Optica’

Quantum technologies are a seminal field of research, especially in relation to their application in communication and computing. In particular, the so-called single-photon emitters – materials that emit single light quanta in quick sequence – are an important building block for such applications. Photons are an excellent means of transmitting data in a fast and secure manner. However, it is necessary to have a sound physical understanding of the structure of the single-photon emitter and how to control them. Therefore, a team of physicists from the University of Münster in Germany and Wrocław University of Science and Technology (Wrocław Tech) in Poland has undertaken the first systematic study of the ultrafast control of single-photon emitters in the two-dimensional material ‘hexagonal boron nitride’ (hBN) using laser pulses. Here, ‘ultrafast’ means faster than one picosecond, which is one-trillionth of a second. The work has been published in the journal ‘Optica’.

 

| Münster (upm/Uni Augsburg)
Laser light (green) is mixed with the sound wave by the artificial atom. This process changes the color of the emitted light quanta (red and blue) with extremely high precision.
© Universität Augsburg - Matthias Weiß

Nanoscale sound waves vibrate artificial atom

A precise mixture of light and sound - a major step forward toward phononic quantum technologies

A German-polish research team from Augsburg, Münster, Munich and Wrocław successfully mixed nanoscale sound waves and light quanta. In their study published in Optica the scientists use an ’artificial atom’ that converts the vibrations of the sound wave to single light quanta - photons - with unprecedented precision. The demonstrated fundamental principle marks an important step toward the development of future hybrid quantum technologies. Light and sound waves form the backbone of modern communication technology. While light transmits data across the globe in fibre optical network, sound wave-based chips are used in the wireless communication between routers, tablets or smartphones. At the dawn of the new era of quantum communications, these two key technologies have been made fit for the future. Here, so-called hybrid quantum technologies are key.