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Quantum technologies

Dieter Meschede's research group

Quantum technologies with single neutral atoms

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Quantum System Pushed to its Speed Limit

Knowing how fast a quantum process can be reveals the ultimate limits to information processing. The brachistochrone problem for two-level quantum systems—the fastest path connecting two quantum states—has been long known. These solutions, however, are generally not applicable to larger quantum systems. In Phys. Rev. X 11, 011035 (2021), we experimentally demonstrate a shortest-duration quantum process that fundamentally cannot be reduced to two-level dynamics.

We carry out fast coherent transport of an atomic wave packet over a distance 15 times its size using an optical conveyor belt. Our measurements of the transport fidelity sharply resolve the transition from a quantum-controllable to a quantum-noncontrollable process as the time is shortened, thus revealing the existence of a minimum duration—a quantum speed limit. Based on a geometric approach to quantum state dynamics, we provide a close lower bound on the minimum process duration beyond the two-level-system paradigm.

These results shed light upon a fundamental speed limit of quantum state dynamics. Identifying quantum processes of the shortest duration is important in quantum sensing and quantum computing.

 
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Humboldt fellow Nir Davidson visits our group

We are happy that Prof. Nir Davidson form the Weizmann Institute of Science spends six weeks with us in Bonn. We thank the Alexander von Humboldt Foundation for its generous support.

 
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Rudolf Kaiser Prize 2017 awarded to Dr. Andrea Alberti

Dr. Andrea Alberti wins the Rudolf Kaiser Prize 2017. Since 1989, the prize is awarded every year by the Rudolf Kaiser Foundation to a young researcher that has distinguished herself/himself in the field of experimental physics. The benefactor, born in Nuremberg in 1923, has been for many years president of the Federal Patent Court in Germany before he obtained in 1979 the habilitation (Habilitation) at the TU München in the field of experimental physics. Since then, Rudolf Kaiser has devoted himself to the support of young researchers in the field of experimental physics.

This year the awarding ceremony will be celebrated on April 20th, 2018, as part of the “Physikalisches Kolloquium der Universität Bonn”. Colleagues and friends from the University of Bonn are cordially invited to the academic cerimony (download the program).

 
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"Quantum Futur-Award" to Dr. Carsten Robens

Dr. Carsten Robens wins the BMBF prize "Quantum Futur-Award" for the best PhD thesis in the research area of quantum technologies. With his PhD thesis, which was defended in February 2017, Carsten Robens has taken a step closer to realizing a quantum computer with neutral atoms. The core result of his work is a new method to control single atoms depending on the internal spin state, which enables an unparalleled control of the position of atoms in so-called polarization synthesized optical lattices. The ceremony has been celebrated at the Universität Stuttgart on March 22nd, 2018 in the framework of the "Quantum Futur-Akademie" (more details here).

 
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Interview with Dieter Meschede about the future of quantum technologies

Quantum technologies are one of the booming research areas of the present days. Since a few years, it is not anymore just about fundamental research questions, but also, and especially, about tangible technological applications, which rely directly on quantum mechanical principles such as superposition states and entanglement. To know more, you can read the interview (in German) with Dieter Meschede speaking about the future of quantum technologies, with particular focus on tap-free communication.
 
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