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, 19, 1110 (2023)
[2] A. Bargerbos et al., PRX Quantum 3, 030311 (2022)
[3] A. Bargerbos et al., PRL 131, 097001 (2023)