Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 71: Quantum Control II (joint session QI/Q)
Q 71.6: Talk
Friday, March 14, 2025, 12:15–12:30, HS II
Optimizing Rydberg Ensemble Dynamics: Double Excitation Suppression — •Vidisha Aggarwal1,2, Boxi Li1, Eloisa Cuestas1, Robert Zeier1, Felix Motzoi1,2, and Tommaso Calarco1,2,3 — 1Peter Grünberg Institute-Quantum Control (PGI-8), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 2Institute for Theoretical Physics, University of Cologne, 50937 Koln, Germany — 3Dipartimento di Fisica e Astronomia, Università di Bologna, 40127 Bologna, Italy
We propose an optimization strategy for Rydberg ensemble dynamics to suppress double excitations and enhance single-photon emission, crucial for quantum technologies like optical communication. Using a Rydberg 'superatom'-an ensemble of Rubidium-87 atoms in an optical cavity-we encode its internal state into an optical qubit [1]. While the Rydberg blockade ideally ensures single-photon emission, imperfections lead to double excitations, hindering controlled retrieval.
To address this, we use the Derivative Removal by Adiabatic Gate (DRAG) method, which introduces an auxiliary pulse to suppress unwanted transitions [2,3]. Though typically used with superconducting qubits, applying DRAG to neutral atoms demonstrates the versatility of quantum control techniques. This approach significantly improves the probability of obtaining just a single Rydberg excitation compared to the experimental pulse.
[1] V. Magro, A. Ourjoumtsev, et al. Nat. Photonics 17, 688*693 (2023). [2] F. Motzoi and F. K. Wilhelm, Phys. Rev. A 88, 062318 (2013). [3] B. Li, F. Motzoi et al., PRX Quantum 3, 030313 (2022).
Keywords: Rydberg Atom; Ensemble; Cavity; Double excitations; DRAG Method