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Exploring Quantum Systems on the Nanoscale

The functionality of almost every electronic or optoelectronic device used today is based on quantum mechanical principles. However, some of the very unique properties of quantum mechanics such as superposition, i.e. objects are in different states at the same time, or entanglement of two quantum mechanical states are not used in mainstream technology, yet. The emerging technology of quantum computing and quantum communication particularly makes use of these phenomena and by that offers novel approaches in solve problems which are literally unsolvable by classical computers or ensuring inherently secure data transmission.

DAll these concepts rely on nanostructured devices and often also on novel materials. In order to implement quantum bit, the unit of information in a quantum computer, the spin information of a single electron in a quantum dot structure can be used. These quantum dots can be realized in semiconductor nanowires. Semiconductor nanostructures can also be employed to emit single photons required for optical quantum communication. Last but not least, the options for devices in quantum systems have been vastly enhanced by the emergence of novel materials such as topological insulators or truly two-dimensional materials.

Nanowire with top gate electrodesSchematic illustration of a semiconductor nanowire with top gate electrodes
Copyright: Sebastian Heedt

Further information:

Hybrid Systems

Topological Insulators

Semiconductor Spin Qubits

2D Materials

Additional Information

Superconductor-Nanowire Hybrid

III-V Semiconductor-Hybrid Systems

III-V semiconductors containing group III and V elements, such as GaAs or AlGaAs, are often the material of choice if it comes to the exploration of quantum effects in semiconductor nanostructures.

more: III-V Semiconductor-Hybrid Systems …
Quintuple Layer

Topological Insulators

Recently a new state of matter, the topological insulator (TI), has sparked enormous scientific activities – both on the theoretical and experimental side – due to its fascinating properties.

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Spin Qubit

Spin Qubits

The research interest of this group is focused on the development of semiconductor based low dimensional quantum systems, such as single impurities in quantum wells, colloidal nanocrystals in epitaxial heterostructures and Stranski-Krastanow quantum dots.

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MoSe2-STEM teaser

2D Materials

Monolayers (ML) of group IV-B transition metal dichalcogenides (TMDs) exhibit remarkable optical properties.

More: 2D Materials …

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