Coherent control of electron spin qubits in silicon using a global field

TL;DR

This paper demonstrates coherent control of electron spin qubits in silicon using a global off-chip magnetic field, advancing scalable quantum computing with silicon technology.

Contribution

It presents the first observation of coherent Rabi oscillations in silicon spin qubits driven by a global dielectric resonator, enabling large-scale qubit control.

Findings

Coherent Rabi oscillations achieved in silicon spin qubits

Global magnetic field can coherently control individual qubits

Pathway established for scalable silicon quantum processors

Abstract

Silicon spin qubits promise to leverage the extraordinary progress in silicon nanoelectronic device fabrication over the past half century to deliver large-scale quantum processors. Despite the scalability advantage of using silicon technology, realising a quantum computer with the millions of qubits required to run some of the most demanding quantum algorithms poses several outstanding challenges, including how to control so many qubits simultaneously. Recently, compact 3D microwave dielectric resonators were proposed as a way to deliver the magnetic fields for spin qubit control across an entire quantum chip using only a single microwave source. Although spin resonance of individual electrons in the globally applied microwave field was demonstrated, the spins were controlled incoherently. Here we report coherent Rabi oscillations of single electron spin qubits in a planar SiMOS quantum dot device using a global magnetic field generated off-chip. The observation of coherent qubit control driven by a dielectric resonator establishes a credible pathway to achieving large-scale control in a spin-based quantum computer.