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Quantum technologies

Dieter Meschede's research group

Quantum technologies with single neutral atoms


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).


"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).


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.

Low-entropy states: Persuading Maxwell’s Demon to order atoms

A new technique allows sorting atoms one by one to form ordered patterns in a periodic lattice with angstrom precision
For German speakers, you can hear the interview with Forschung aktuell of Deutschlandfunk – Sortiergerät für Atome: Forscher präparieren Quantenregister im Rekordtempo (broadcast on March 9th)
Creating low-entropy states of neutral matter is one of the outstanding problems in the field of quantum optics. These states are an indispensable cornerstone of future applications in quantum information science, ranging from quantum simulations to quantum information processing. In Robens et al. Phys. Rev. Lett. 118, 065302 (2017), we demonstrate a new technique using two periodic optical potentials—the storage and shift register—to sort neutral atoms one by one into predefined patterns. Hence, our original experimental scheme acts akin to a Maxwell daemon preparing states with virtually zero entropy. Behind this scheme stands a novel idea for the fast, high-precision synthesis of polarization states of light—hence the name of polarization-synthesized optical lattices. Using the storage and shift register enables a novel sorting algorithm of logarithmic complexity, which holds promise to sort even a thousand atoms into a predefined target pattern with angstrom precision in a second. In our manuscript, we give a proof-of-concept demonstration by generating low entropy states with four atoms (see figure).
Original publication: C. Robens, J. Zopes, W. Alt, S. Brakhane, D. Meschede, and A. Alberti, "Low-Entropy States of Neutral Atoms in Polarization-Synthesized Optical Lattices", Phys. Rev. Lett. 118, 065302 (2017).
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