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Quantum technology seminar | Building the second quantum revolution
(Forschungszentrum Jülich and University of Cologne)
Quantum mechanics is at the basis of all present-day information and
communication technologies: to name just two examples, transistors and
lasers would be impossible to build without understanding the quantum
behaviour of matter and light. But the control of individual quantum
systems has long been considered only a “thought experiment”, something only
possible in theory. However, today this is routinely achieved in labs
around the world, and it is the basis of quantum technologies. Applications range
from secure communications to ultra-high precision sensing and metrology,
and from extremely powerful computers to the simulation of complex
To achieve this vision in real environments, we need to push our ability to
control the dynamics of increasingly complex quantum systems to its limits.
In the case of quantum systems with few particles, the decoherence occurring
due to the interaction with the environment hinders the realisation of
desired processes. In quantum many-body systems, the complexity of their dynamics
makes the state preparation by external manipulation more difficult. I will
show that Quantum Optimal Control Theory provides an effective strategy to
overcome these problems. Quantum coherence is used to achieve a desired
target with high accuracy, even under real conditions. I present current
experiments that have been made possible by our new optimal control
algorithm, and explain how we can use such methods to push the limits of
the physical realisation of quantum technologies.
Looking forward to stimulating discussions,
the DESY FS-QT task force
(Martin Beye, Ralf Röhlsberger, Kai Rossnagel, Robin Santra, Andreas