SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 43: QI Poster II (joint session QI/Q)

Q 43.8: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

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

Qubit arrays form the basic unit of quantum computers. As such, it is desirable to be able to manipulate each qubit as needed. However, including a local control on every qubit is not scalable to a large number of qubits. On the other hand, reducing the number of controls might be sufficient for manipulation but slow down the implementation of quantum gates, bringing the system closer to the decoherence limit. Here, we investigate how quickly quantum gates can be implemented depending on the number of local controls. In particular, we show how the quantum speed limit (the shortest time to generate a quantum gate) increases when reducing the number of controls. We determine this limit for a universal set of gates for different 3-qubit systems using Krotov's optimization method.