Title: Josephson-junction technology for multi-qubit quantum processors
Overview
- Date:Starts 9 February 2023, 10:00Ends 9 February 2023, 12:00
- Location:Kollektorn, MC2
- Language:English
Discussion leader is Prof. Attila Geresdi
Examiner: Prof. Per Delsing.
Supervisors: Dr. Anita Fadavi Roudsari and Associate Professor Jonas Bylander
Abstract:
Josephson junctions are the building block of superconducting qubits. They play the most crucial role in determining the qubit frequency, beside their effect on qubit coherence. The qubit frequency reproducibility is one of the main challenges towards scaling superconducting quantum computers, where deviations in the fabrication process of the junction from the design parameters leads to cross-talk between qubits on a quantum processor. In this talk, I first present our simplified Josephson junction fabrication technique, making high performance qubits with reproducible frequencies. Then I present our further work on reducing the uncertainty in qubit frequency by using wider junctions. Here, we achieved a low spread of 40 MHz in frequency, which is a state-of-the-art reproducibility level with qubit quality factors exceeding 2 million.
Coffee will be served outside Kollektorn 09:45
