Moritz Fleischer

Veranstal­tungs­manage­ment I Öffentlich­keitsarbeit
Kommunikation und Medien
Tel.: +49 351 260 3498

Eye catcher

HZDR Research Talks

Die HZDR Research Talks finden mittwochs von 13:00 bis 14:00 Uhr statt.

Die nächsten Termine sind:

17. März 2021

von Dr. René Hübner (Strukturanalytik)

24. Februar 2021

von Dr. Nina Elkina (IT - Infrastruktur)

Regardless of a technical implementation of a reversible computer the erasure of one bit releases at least kBT log 2  ≈ 0.017 eV (at room temperature) of energy, as stated by Landauer's principle [1]. This makes the future of High Performance Computing (HPC) not only dark but also quite hot. And the slowdown in the computational power increasing rate is already reflected in the Top500 list of the most powerful computers in the world [2]. Therefore we have 2 questions on the agenda:
1) what is the next technology to catch up with constantly increasing needs for High Performance Computing and 2) how to survive the transition period while keeping the same pace of scientific progress. We are relatively lucky with the latter, since classical HPC has still a great room for improvement by exploiting the hardware and new numerical methods. In this regard having Hemera, the cluster on HZDR premises, allows to support current needs to predict near future demands of the local scientific community working with diverse computational models. I will briefly outline the computational landscape of HZDR, partially discovered during the first round of the seminar series 'Hardware and Numerics'. Then I will proceed to computationally intensive projects related to laboratory astrophysics and study of strong field QED effects in photon-photon collider experiment of LUXE [3] hosted at DESY. This experiment aims to measure quantum rates of electron-positron pairs production in substantially non-perturbative QED regime of field-assisted electron-positronpair creation and nonlinear Compton scattering. Due to multiple uncertainties in the field configuration the experiment needs to be supported with numerical simulations of realistic distributions of electromagnetic fields with subsequent optimization for a maximum yield of pairs. This requires solutions of transport equations either deterministic grid based or by means of stochastic Monte Carlo methods [4]. Both approaches are widely used for simulation in various scientific domains and searching for more accurate numerical implementations with fewer bit operations are of primary importance. The last but not least part of my talk will touch a problem of quantum computing, one of viable candidate to pick HPC's race in the post-silicon era. Most of quantum computing operations are unitary which implies reversibility. Therefor the restriction imposed by Landauer's principle will be mitigated. But hardware for quantum computers is still in its infancy and only a few qubits prototypes are commercially available. While attempts to simulate quantum computer algorithms on classical HPC face a problem of exponential complexity. From the other hand the data intensive nature of quantum computer simulators makes them a perfect testbed for benchmarking classical HPC clusters. I will conclude my talk with preliminary results of the Hemera quantum simulator project.

[1] R. Landauer, Irreversibility and Heat Generation in the Computing Process, IBM Journal of R&D, 5, 183-191 (1961)
[3] LUXE Collaboration Team, Conceptual Design Report for the LUXE Experiment, arXiv:2102.02032, (2021)
[4] Elkina N., Fedotov A., et al. QED cascades induced by circularly polarized laser elds, Phys. Rev. STAB 14, 054401 (2011).

Die Research Talks sind ein Angebot an HZDR-Mitarbeiterinnen und -Mitarbeiter aller Forschungsbereiche. Dabei informieren Wissenschaftlerinnen und Wissenschaftler in Fachvorträgen über aktuelle Projekte, Methoden und Verfahren und freuen sich auf den Austausch mit Kolleginnen und Kollegen, um gemeinsam Ideen zu entwickeln und Projekte anzuschieben. Auch für externe Interessenten sind die Research Talks offen zugänglich.

  • Die Vorträge und Diskussionen werden in Englisch gehalten.
  • Die Teilnahme ist kostenlos.
  • Eine Anmeldung ist nicht erforderlich. Externe Besucher melden sich bitte 30 Minuten vorher am HZDR Haupteingang.

Dr. Franziska Lederer (Helmholtz-Institut Freiberg für Ressourcentechnologie, Abteilung Biotechnologie)
Telefon: +49 351 260 2427
E-Mail: f.lederer@hzdr.de

Dr. Kristof Zarschler (Institut für Radiopharmazeutische Krebsforschung, Abteilung Radionuklid-Theragnostika)
Telefon: +49 351 260 3678
E-Mail: k.zarschler@hzdr.de

Dr. Peter Zahn (Institut für Ionenstrahlphysik und Materialforschung, Abteilung Skalierungsphänomene)
Telefon: +49 351 260 3121
E-Mail: p.zahn@hzdr.de

Dr. Björn Drobot (Institut für Ressourcenökologie, Abteilung Biogeochemie)
Telefon: +49 351 260 2759
E-Mail: b.drobot@hzdr.de

Dr. Sandra Hamann (Programmplanung und internationale Projekte)
Telefon: +49 351 260 3649
E-Mail: s.hamann@hzdr.de

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