Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 61: Ultra-cold Plasmas and Rydberg Systems II (joint session A/Q)
Q 61.2: Talk
Thursday, March 13, 2025, 14:45–15:00, HS PC
Calculating Rydberg interactions with pairinteraction-next — •Johannes Mögerle1, Frederic Hummel2, Henri Menke3, and Sebastian Weber1 — 1Institute for Theoretical Physics III and Center for Integrated Quantum Science and Technology, University of Stuttgart, Germany — 2Atom Computing, Inc., Berkeley, California — 3Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
Rydberg atoms are utilized in a variety of experimental applications, including quantum simulations, ultracold chemistry, and quantum information. Their strong and highly tunable interactions via external fields and their inter-atomic distance vector make them a powerful platform for these applications. Many of these experiments are conducted with such high precision that perturbative calculations of the interaction potentials are insufficient, and exact calculations are needed.
In this talk, we present a new version of the pairinteraction software, a tool for calculating the interaction potentials between two Rydberg atoms in arbitrary fields, as well as interesting properties like dipole matrix elements and effective Hamiltonians. The updated pairinteraction version now includes simulations of alkaline earth atoms, described by multichannel quantum defect theory (MQDT), leading to larger Hilbert spaces. These calculations are now feasible due to the improved performance of the C++ backend. Additionally, the new version features a Python package that abstracts the C++ backend, providing users with a high-level and easy-to-use Python interface.
Keywords: Rydberg atoms; MQDT; pairinteraction