Interfacing a Topological Qubit with a Spin Qubit in a Hybrid Quantum System

We present and analyze a hybrid quantum system that interfaces a Majorana-hosted semiconductor nanowire with a single nitrogen-vacancy (N- V) center via a magnetized torsional cantilever. We show that the torsional mode of the mechanical resonator can strongly couple to the Majorana qubit and the spin qubit simultaneously, which allows us to interface them for quantum-state conversion through a dark-state protocol. This work provides a promising interface between the topological qubit and the conventional spin qubit. This interface may have interesting applications in quantum information and computation.