Regensburg 2022 – scientific programme

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QI: Fachverband Quanteninformation

QI 13: Implementations: Superconducting Qubits

QI 13.1: Invited Talk

Friday, September 9, 2022, 09:30–10:00, H8

Scalable control of superconducting qubits — •Stefan Filipp — Walther-Meissner-Institut, 85748 Garching — TU Munich, Physics-Department, 85748 Garching

The rapid development of quantum technologies in the recent past has led to the realization of first quantum computer prototypes that promise to outperform conventional computers in specific types of problems. However, before practical real-life problems can be solved efficiently on quantum computers we have to still tackle numerous challenges not only to enhance the coherence, but also the control of qubits. To improve the fidelity of single qubit operations we utilize closed-loop optimization methods based on high duty-cycle measurements. With piecewise-constant pulse parameterizations we are able to demonstrate short, 4ns single-qubit pulses with high fidelity and low leakage. We further explore architectures that contain 'hidden' qubits, which are not directly addressable, and experimentally demonstrate full control and measurement capabilities of such a hidden qubit. I will then discuss the impact of such restricted control capabilities on the performance of specific qubit coupling networks. I will further preview promising future directions such as the use of adiabatic gates for quantum feed-forward neural networks and multi-qubit gate operations for the efficient implementation of quantum algorithms as part of the newly formed Munich Quantum Valley, a cross-disciplinary initiative to realize a full-stack quantum computer.