Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 71: Quantum Control II (joint session QI/Q)
Q 71.2: Talk
Friday, March 14, 2025, 11:15–11:30, HS II
Comparison of Gate-set evaluation metrics for closed-loop optimal control on nitrogen-vacancy center ensembles in diamond — •Thomas Reisser3,4, Philipp J. Vetter1,2, Maximilian G. Hirsch1,2,5, Tommaso Calarco3,4,6, Felix Motzoi3,4, Fedor Jelezko1,2, and Matthias M. Müller3 — 1Institute for Quantum Optics, Ulm University, 89081 Germany — 2Center for Integrated Quantum Science and Technology (IQST), 89081 Germany — 3Institute for Quantum Control (PGI-8), Forschungszentrum Jülich GmbH, 52425 Germany — 4Institute for Theoretical Physics, University of Cologne, 50937 Germany — 5NVision Imaging Technologies GmbH, 89081 Germany — 6Dipartimento di Fisica e Astronomia, Università di Bologna, 40127 Italy
Precise control of a quantum system is a prerequisite for quantum information, quantum computing, and quantum metrology. Quantum gates on ensembles of nitrogen vacancy centers usually suffer from decoherence, large amplitude errors, imperfect state preparation and therefore limited total operation fidelity. Large state preparation and measurement errors can cause the typically used quantum process tomography to fail. We investigate the applicability of quantum process tomography, linear inversion gate-set tomography, randomized linear gate-set tomography, and randomized benchmarking as measures for closed-loop quantum optimal control experiments. Closed-loop optimizations are performed and evaluated with all measures to find a gate-set with universally improved performance and demonstrate the relative trade-offs between the methods.
Keywords: nv center; optimal control; tomography; quantum; ensemble