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A: Fachverband Atomphysik

A 21: Poster – Atomic Systems in External Fields

A 21.5: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG

High-fidelity multistate Stimulated Raman adiabatic passage via parallel eigenenergies — •Julian K. Dimitrov and Nikolay V. Vitanov — Center for Quantum Technologies, Department of Physics, Sofia University, James Bourchier 5 blvd., 1164 Sofia, Bulgaria

We present a new approach to high-fidelity multistate Stimulated Raman adiabatic passage (STIRAP). Techniques that optimize multistate STIRAP have been proposed before and they require using additional (shortcut) fields. Here we propose an optimization which does not require additional fields but pulse shaping only. The optimization is based upon the concept of quasi-parallel eigenenergies, which are known to suppress nonadiabatic transitions between two states. It is shown analytically how the parallelization criterion imposes certain time-dependent pulse shapes of the driving fields. Similar to parallel three-level STIRAP, proposed earlier, the parallel multistate STIRAP is robust to errors in the driving fields and the detunings while leaving the intermediate states unpopulated in the adiabatic limit. Moreover, this improvement of fidelity does not require prohibitively large pulse areas. We manage to enhance the STIRAP fidelity by up to 5 orders of magnitude thereby making multistate STIRAP suitable for quantum information processing. We anticipate applications in atomic clocks and atom optics.

Keywords: STIRAP; coherent control; quantum control; high-fidelity optimization; multistate STIRAP