Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 37: Poster III

Q 37.24: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent B

Quantum speed limit dependence on the number of controls in a qubit array — •David Pohl, Fernando Gago-Encinas, Matthias Krauß, and Christiane P. Koch — Arnimallee 14, 14195 Berlin

Universal quantum computing requires operator controllability of the qubit array. This is typically realized via qubit-qubit couplings and local external controls on every qubit which becomes challenging when scaling to large numbers of qubits. We have shown recently that the number of external controls can be reduced to the extreme limit of a single control. However, this comes at the expense of longer gate durations. Here, we investigate the gate duration depending on the number of local controls. In particular, we show that reducing controls increases the quantum speed limit (the shortest time to generate a quantum gate). We determine this limit for a universal set of gates for different 3-qubit systems using quantum optimal control.

Keywords: Quantum Control; Quantum Speed Limit; Controllability; Universal Quantum Computing