Ge hole spin qubit

TL;DR

This paper demonstrates the control and measurement of hole spin qubits in germanium quantum dots, showing coherent oscillations and dephasing times, highlighting Ge's potential for scalable quantum computing.

Contribution

The study introduces Ge hut wire double quantum dots with demonstrated electric-dipole spin resonance and coherent hole spin control, advancing quantum dot qubit technology.

Findings

Observation of Pauli spin blockade in Ge quantum dots

Rabi oscillations with frequencies up to 140 MHz

Dephasing times of 130 ns for hole spins

Abstract

Holes confined in quantum dots have gained considerable interest in the past few years due to their potential as spin qubits. Here we demonstrate double quantum dot devices in Ge hut wires. Low temperature transport measurements reveal Pauli spin blockade. We demonstrate electric-dipole spin resonance by applying a radio frequency electric field to one of the electrodes defining the double quantum dot. Next, we induce coherent hole spin oscillations by varying the duration of the microwave burst. Rabi oscillations with frequencies reaching 140MHz are observed. Finally, Ramsey experiments reveal dephasing times of 130ns. The reported results emphasize the potential of Ge as a platform for fast and scalable hole spin qubit devices.