Kou, Angela

Date:    Friday, September 1, 2023 
Time:    11:00
Place:    ETH Campus Hönggerberg, HPF G 6
Hosts:   Alexander Grimm and Yiwen Chu 

Coupling an Andreev spin qubit to a transmon

Angela Kou –  University of Illinois Urbana-Champaign, USA

Abstract: While there are multiple platforms for implementing qubits, no single type of qubit currently excels at every task necessary to build a quantum computer. Some platforms are better-suited as quantum memories while others may be better for quantum operations. Recently, it has been suggested that building hybrid quantum systems that can harness the benefits of different platforms may be a useful model for a quantum computer.

In this talk, I will discuss the advantages and challenges associated with coupling superconducting qubits to semiconducting spin qubits. These two leading platforms have complementary benefits; semiconducting spin qubits have long lifetimes but are difficult to couple over long distances while superconducting qubits can be coupled over long ranges but have shorter lifetimes. I will show our experimental work implementing an Andreev spin qubit (ASQ) and then coupling it to a superconducting transmon [1]. I will also discuss our work using a superconducting transmon to investigate mesoscopic superconducting phenomena such as the anomalous Josephson effect and the phase diagram of a superconducting quantum dot system [2,3].

[1] M. Pita-Vidal et al., Nature Physics, in press (2023)
[2] A. Bargerbos et al., PRX Quantum 3, 030311 (2022)
[3] A. Bargerbos et al., arxiv: 2208.09314