Blueprint for all-to-all connected superconducting spin qubits

TL;DR

This paper proposes an architecture for superconducting spin qubits that enables all-to-all connectivity among multiple remote qubits, facilitating scalable quantum computing and simulation with high qubit connectivity.

Contribution

It introduces a novel scalable architecture for all-to-all connected superconducting spin qubits, addressing a key challenge in extending qubit coupling.

Findings

Achieves selective connectivity between any pair of qubits.

Demonstrates feasible readout using circuit QED techniques.

Offers higher qubit connectivity than other solid-state platforms.

Abstract

Andreev (or superconducting) spin qubits (ASQs) have recently emerged as a promising qubit platform that combines superconducting circuits with semiconductor spin degrees of freedom. While recent experiments have successfully coupled two ASQs, how to realize a scalable architecture for extending this coupling to multiple distant qubits remains an open question. In this work, we resolve this challenge by introducing an architecture that achieves all-to-all connectivity between multiple remote ASQs. Our approach enables selective connectivity between any qubit pair while maintaining all other qubit pairs uncoupled. Furthermore, we demonstrate the feasibility of efficient readout using circuit quantum electrodynamics techniques and compare different readout configurations. Our architecture shows promise both for gate-based quantum computing and for analog quantum simulation applications by offering higher qubit connectivity than alternative solid-state platforms.