Program summer term 2022

Mo, 04.07.2022, 16:15 lecture hall Physik, 28 D 001

Constantin Häfner (Fraunhofer Institute for Laser Technology, Aachen)

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Mo, 13.06.2022, 16:15 lecture hall Physik, 28 D 001

Alfons Weber (Mainz University)

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Mo, 30.05.2022, 16:15 lecture hall Physik, 28 D 001

Jonathan Home (ETH Zurich)

The quest to scale ion trap quantum computers

 

Abstract:

Trapped-ions are among the leading platforms for realising large-scale quantum computers, offering excellent coherence as well as demonstrations of the highest fidelity quantum logic gates. However many challenges, both technical and scientific remain in scaling these systems to relevant sizes for performing useful algorithms. I will give an overview of our work in both of these areas. On the technical side, this includes the integration of photonics on the chips used to trap ions, simplifying the delivery of light. Scientifically, we have explored new ways of realising quantum error correction with ions, which has enabled us to demonstrate using hundreds of rounds of correction that the coherence of a logical qubit can be extended by a factor of more than 3.
 

 

Host: Markus Müller

 

 

 

Mo, 16.05.2022, 16:15 lecture hall Physik, 28 D 001

Stefan Hecht (Leibniz Institute for Interactive Materials, Aachen)

Enlightening Materials, Devices, and Manufacturing

 

Abstract:

Using an external light stimulus to control and power advanced materials and devices thereof in a dynamic fashion with superior spatial and temporal resolution offers tremendous opportunities. In this context, molecular photoswitches that undergo reversible changes upon illumination have become key ingredients. To develop these systems into high-performing materials and practical applications the switching processes have to be highly efficient and reliable. Both criteria are stringent and necessitate continuing optimization of key parameters, involving spectral separation and selective addressability, high quantum yields, and enhanced (photo)chemical resistance enabling highly repetitive switching without fatigue. Importantly, the photoswitchable systems have to undergo significant changes of a physicochemical property to maximize the overall achievable modulation. This presentation will highlight selected examples from our laboratory to illustrate how progress in molecular design can be translated into material, device, and manufacturing innovation.

 

Host: Carsten Honerkamp