Circuit Quantum Electrodynamics with a Spin Qubit

TL;DR

This paper demonstrates coupling a spin qubit in an InAs nanowire to a superconducting cavity, enabling single spin control and measurement within a circuit quantum electrodynamics framework.

Contribution

It introduces a hybrid system combining spin qubits with circuit QED, showing feasible spin-cavity coupling and single spin measurement capabilities.

Findings

Achieved a spin-cavity coupling strength of 1 MHz.

Demonstrated electric dipole spin resonance for single spin rotations.

Measured spin lifetime and observed coherent spin dynamics.

Abstract

Circuit quantum electrodynamics allows spatially separated superconducting qubits to interact via a "quantum bus", enabling two-qubit entanglement and the implementation of simple quantum algorithms. We combine the circuit quantum electrodynamics architecture with spin qubits by coupling an InAs nanowire double quantum dot to a superconducting cavity. We drive single spin rotations using electric dipole spin resonance and demonstrate that photons trapped in the cavity are sensitive to single spin dynamics. The hybrid quantum system allows measurements of the spin lifetime and the observation of coherent spin rotations. Our results demonstrate that a spin-cavity coupling strength of 1 MHz is feasible.