[2024-08-30 Max Hays]

Two promising architectures for solid-state quantum computing are electron spins trapped in semiconductor quantum dots and the collective electromagnetic modes of superconducting circuits. In this talk I will explore the fusion of these two platforms in our realization of an Andreev spin qubit, the residual degree of freedom of a quasiparticle trapped in the Andreev levels of a Josephson semiconductor nanowire. The interplay between the spin-orbit coupling in the semiconductor and the superconducting-phase bias results in a spin-split spectrum without an applied Zeeman field. First, I will focus on our original work (Hays, Science 2021), where we achieved coherent spin manipulation by integrating single-shot circuit QED readout and spin-flipping Raman transitions in a naturally occurring Λ system. Next, I will briefly review recent advances in the field, highlighting the demonstration of long-range coupling between two Andreev spin qubits, surpassing the long-range coupling strengths that have been achieved using conventional spin qubits. Finally, I will discuss the challenges of scaling to larger system sizes, and the potential benefits of an Andreev-qubit-based quantum computer.